{"id":53426,"date":"2025-08-12T11:09:55","date_gmt":"2025-08-12T03:09:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/53426.html"},"modified":"2025-08-12T11:09:55","modified_gmt":"2025-08-12T03:09:55","slug":"%e5%9f%ba%e7%a1%8018-java-stream-api%ef%bc%9a%e9%ab%98%e6%95%88%e5%a4%84%e7%90%86%e9%9b%86%e5%90%88%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/53426.html","title":{"rendered":"\u57fa\u784018-Java Stream API\uff1a\u9ad8\u6548\u5904\u7406\u96c6\u5408\u6570\u636e"},"content":{"rendered":"<h2>Java Stream API&#xff1a;\u9ad8\u6548\u5904\u7406\u96c6\u5408\u6570\u636e<\/h2>\n<p>\u5728Java\u7f16\u7a0b\u4e2d&#xff0c;\u96c6\u5408\u64cd\u4f5c\u662f\u65e5\u5e38\u5f00\u53d1\u7684\u6838\u5fc3\u4efb\u52a1\u4e4b\u4e00\u3002\u4f20\u7edf\u7684\u96c6\u5408\u5904\u7406\u65b9\u5f0f\u5f80\u5f80\u9700\u8981\u7f16\u5199\u5927\u91cf\u8fed\u4ee3\u5668\u548c\u6761\u4ef6\u5224\u65ad\u4ee3\u7801&#xff0c;\u4e0d\u4ec5\u5197\u957f\u7e41\u7410&#xff0c;\u800c\u4e14\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u8f83\u5dee\u3002Java 8\u5f15\u5165\u7684Stream API\u5f7b\u5e95\u6539\u53d8\u4e86\u8fd9\u4e00\u73b0\u72b6&#xff0c;\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u58f0\u660e\u5f0f\u3001\u51fd\u6570\u5f0f\u7684\u96c6\u5408\u5904\u7406\u65b9\u5f0f&#xff0c;\u8ba9\u5f00\u53d1\u8005\u80fd\u591f\u4ee5\u66f4\u7b80\u6d01\u3001\u66f4\u9ad8\u6548\u7684\u65b9\u5f0f\u5904\u7406\u6570\u636e\u3002<\/p>\n<p>\u672c\u6587\u5c06\u5168\u9762\u89e3\u6790Java Stream API\u7684\u8bbe\u8ba1\u7406\u5ff5\u3001\u6838\u5fc3\u529f\u80fd\u548c\u5b9e\u6218\u6280\u5de7&#xff0c;\u901a\u8fc7\u5927\u91cf\u4ee3\u7801\u793a\u4f8b\u5c55\u793a\u5982\u4f55\u5229\u7528Stream API\u7b80\u5316\u96c6\u5408\u64cd\u4f5c\u3001\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf&#xff0c;\u5e76\u6df1\u5165\u63a2\u8ba8\u5176\u6027\u80fd\u4f18\u5316\u673a\u5236\u3002\u65e0\u8bba\u662f\u521a\u63a5\u89e6Stream\u7684\u521d\u5b66\u8005&#xff0c;\u8fd8\u662f\u5e0c\u671b\u6df1\u5165\u638c\u63e1\u5176\u9ad8\u7ea7\u7279\u6027\u7684\u5f00\u53d1\u8005&#xff0c;\u90fd\u80fd\u4ece\u672c\u6587\u4e2d\u83b7\u5f97\u6709\u4ef7\u503c\u7684\u77e5\u8bc6\u3002<\/p>\n<h3>\u4e00\u3001Stream API\u6982\u8ff0&#xff1a;\u4e3a\u4ec0\u4e48\u9700\u8981Stream&#xff1f;<\/h3>\n<p>\u5728Java 8\u4e4b\u524d&#xff0c;\u5904\u7406\u96c6\u5408\u6570\u636e\u901a\u5e38\u9700\u8981\u4f7f\u7528for\u5faa\u73af\u6216Iterator\u8fdb\u884c\u8fed\u4ee3&#xff0c;\u7136\u540e\u901a\u8fc7if\u6761\u4ef6\u5224\u65ad\u7b5b\u9009\u5143\u7d20&#xff0c;\u518d\u8fdb\u884c\u8f6c\u6362\u6216\u805a\u5408\u64cd\u4f5c\u3002\u8fd9\u79cd\u547d\u4ee4\u5f0f\u7f16\u7a0b\u98ce\u683c\u5b58\u5728\u8bf8\u591a\u95ee\u9898&#xff1a;<\/p>\n<ul>\n<li>\u4ee3\u7801\u5197\u957f&#xff1a;\u5b8c\u6210\u7b80\u5355\u7684\u6570\u636e\u5904\u7406\u4efb\u52a1\u4e5f\u9700\u8981\u7f16\u5199\u591a\u884c\u4ee3\u7801\u3002<\/li>\n<li>\u53ef\u8bfb\u6027\u5dee&#xff1a;\u8fed\u4ee3\u903b\u8f91\u4e0e\u4e1a\u52a1\u903b\u8f91\u6df7\u6742&#xff0c;\u96be\u4ee5\u5feb\u901f\u7406\u89e3\u4ee3\u7801\u610f\u56fe\u3002<\/li>\n<li>\u5e76\u884c\u5904\u7406\u590d\u6742&#xff1a;\u624b\u52a8\u5b9e\u73b0\u96c6\u5408\u7684\u5e76\u884c\u5904\u7406\u9700\u8981\u8003\u8651\u7ebf\u7a0b\u5b89\u5168\u3001\u4efb\u52a1\u62c6\u5206\u7b49\u590d\u6742\u95ee\u9898\u3002<\/li>\n<li>\u5bb9\u6613\u51fa\u9519&#xff1a;\u8fed\u4ee3\u8fc7\u7a0b\u4e2d\u4fee\u6539\u96c6\u5408\u53ef\u80fd\u5bfc\u81f4ConcurrentModificationException&#xff0c;\u8fb9\u754c\u6761\u4ef6\u5904\u7406\u5bb9\u6613\u51fa\u9519\u3002<\/li>\n<\/ul>\n<p>Stream API\u7684\u51fa\u73b0\u6b63\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898&#xff0c;\u5b83\u501f\u9274\u4e86\u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u601d\u60f3&#xff0c;\u63d0\u4f9b\u4e86\u4e00\u79cd\u9ad8\u6548\u3001\u7b80\u6d01\u7684\u6570\u636e\u5904\u7406\u65b9\u5f0f\u3002<\/p>\n<h4>1. \u4ec0\u4e48\u662fStream&#xff1f;<\/h4>\n<p>Stream&#xff08;\u6d41&#xff09; \u662fJava 8\u5f15\u5165\u7684\u4e00\u4e2a\u5168\u65b0\u6982\u5ff5&#xff0c;\u5b83\u4e0d\u662f\u6570\u636e\u7ed3\u6784&#xff0c;\u4e5f\u4e0d\u5b58\u50a8\u6570\u636e&#xff0c;\u800c\u662f\u4ee3\u8868\u4e86\u4e00\u7cfb\u5217\u652f\u6301\u8fde\u7eed\u3001\u5e76\u884c\u805a\u5408\u64cd\u4f5c\u7684\u5143\u7d20\u5e8f\u5217\u3002Stream API\u7684\u6838\u5fc3\u601d\u60f3\u662f\u5c06\u96c6\u5408\u7684\u5904\u7406\u8fc7\u7a0b\u62bd\u8c61\u4e3a\u6d41\u6c34\u7ebf\u5f0f\u7684\u64cd\u4f5c&#xff0c;\u5f00\u53d1\u8005\u53ea\u9700\u5173\u6ce8&#034;\u505a\u4ec0\u4e48&#034;&#xff0c;\u800c\u65e0\u9700\u5173\u5fc3&#034;\u600e\u4e48\u505a&#034;&#xff08;\u5982\u8fed\u4ee3\u65b9\u5f0f\u3001\u5e76\u884c\u5904\u7406\u7b49&#xff09;\u3002<\/p>\n<p>Stream\u7684\u7279\u70b9\u53ef\u4ee5\u6982\u62ec\u4e3a&#xff1a;<\/p>\n<ul>\n<li>\u975e\u5b58\u50a8\u6027&#xff1a;Stream\u4e0d\u5b58\u50a8\u6570\u636e&#xff0c;\u6570\u636e\u6765\u6e90\u4e8e\u96c6\u5408\u3001\u6570\u7ec4\u6216\u5176\u4ed6\u751f\u6210\u5668\u3002<\/li>\n<li>\u529f\u80fd\u6027&#xff1a;Stream\u64cd\u4f5c\u4e0d\u4f1a\u4fee\u6539\u6e90\u6570\u636e&#xff0c;\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684Stream\u3002<\/li>\n<li>\u60f0\u6027\u6c42\u503c&#xff1a;\u4e2d\u95f4\u64cd\u4f5c&#xff08;\u5982\u8fc7\u6ee4\u3001\u6620\u5c04&#xff09;\u4e0d\u4f1a\u7acb\u5373\u6267\u884c&#xff0c;\u76f4\u5230\u7ec8\u7aef\u64cd\u4f5c&#xff08;\u5982\u6536\u96c6\u3001\u8ba1\u6570&#xff09;\u88ab\u8c03\u7528\u65f6\u624d\u4f1a\u89e6\u53d1\u5b9e\u9645\u8ba1\u7b97\u3002<\/li>\n<li>\u4e00\u6b21\u6027&#xff1a;\u4e00\u4e2aStream\u53ea\u80fd\u88ab\u6d88\u8d39\u4e00\u6b21&#xff0c;\u518d\u6b21\u4f7f\u7528\u4f1a\u629b\u51faIllegalStateException\u3002<\/li>\n<li>\u53ef\u5e76\u884c&#xff1a;Stream API\u539f\u751f\u652f\u6301\u5e76\u884c\u5904\u7406&#xff0c;\u65e0\u9700\u7f16\u5199\u590d\u6742\u7684\u591a\u7ebf\u7a0b\u4ee3\u7801\u3002<\/li>\n<\/ul>\n<h4>2. Stream\u4e0e\u96c6\u5408\u7684\u533a\u522b<\/h4>\n<table>\n<tr>\u7279\u6027\u96c6\u5408&#xff08;Collection&#xff09;\u6d41&#xff08;Stream&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u5b58\u50a8<\/td>\n<td>\u5b58\u50a8\u6570\u636e\u5143\u7d20<\/td>\n<td>\u4e0d\u5b58\u50a8\u6570\u636e&#xff0c;\u4ec5\u63cf\u8ff0\u64cd\u4f5c<\/td>\n<\/tr>\n<tr>\n<td>\u5173\u6ce8\u70b9<\/td>\n<td>\u6570\u636e\u7684\u6301\u6709<\/td>\n<td>\u6570\u636e\u7684\u5904\u7406<\/td>\n<\/tr>\n<tr>\n<td>\u8fed\u4ee3\u65b9\u5f0f<\/td>\n<td>\u5916\u90e8\u8fed\u4ee3&#xff08;\u663e\u5f0f\u4f7f\u7528for\u5faa\u73af&#xff09;<\/td>\n<td>\u5185\u90e8\u8fed\u4ee3&#xff08;Stream\u81ea\u52a8\u5904\u7406\u8fed\u4ee3&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u6267\u884c\u65f6\u673a<\/td>\n<td>\u5373\u65f6\u6267\u884c<\/td>\n<td>\u60f0\u6027\u6267\u884c&#xff08;\u7ec8\u7aef\u64cd\u4f5c\u89e6\u53d1\u8ba1\u7b97&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u53ef\u91cd\u7528\u6027<\/td>\n<td>\u53ef\u591a\u6b21\u904d\u5386<\/td>\n<td>\u53ea\u80fd\u904d\u5386\u4e00\u6b21<\/td>\n<\/tr>\n<tr>\n<td>\u5e76\u884c\u5904\u7406<\/td>\n<td>\u9700\u8981\u624b\u52a8\u5b9e\u73b0<\/td>\n<td>\u539f\u751f\u652f\u6301&#xff08;parallelStream()&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3. Stream API\u7684\u4f18\u52bf<\/h4>\n<ul>\n<li>\u4ee3\u7801\u7b80\u6d01&#xff1a;\u7528\u5c11\u91cf\u4ee3\u7801\u5b9e\u73b0\u590d\u6742\u7684\u6570\u636e\u5904\u7406\u903b\u8f91&#xff0c;\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u3002<\/li>\n<li>\u53ef\u8bfb\u6027\u5f3a&#xff1a;\u58f0\u660e\u5f0f\u7f16\u7a0b\u98ce\u683c\u4f7f\u4ee3\u7801\u610f\u56fe\u66f4\u6e05\u6670&#xff0c;\u4fbf\u4e8e\u7ef4\u62a4\u3002<\/li>\n<li>\u6613\u4e8e\u5e76\u884c\u5316&#xff1a;\u53ea\u9700\u8c03\u7528parallel()\u65b9\u6cd5\u5373\u53ef\u5b9e\u73b0\u5e76\u884c\u5904\u7406&#xff0c;\u5145\u5206\u5229\u7528\u591a\u6838CPU\u3002<\/li>\n<li>\u51fd\u6570\u5f0f\u96c6\u6210&#xff1a;\u4e0eLambda\u8868\u8fbe\u5f0f\u3001\u65b9\u6cd5\u5f15\u7528\u7b49\u51fd\u6570\u5f0f\u7279\u6027\u65e0\u7f1d\u96c6\u6210\u3002<\/li>\n<li>\u4e30\u5bcc\u7684\u64cd\u4f5c&#xff1a;\u63d0\u4f9b\u4e86\u5927\u91cf\u5185\u7f6e\u64cd\u4f5c&#xff08;\u8fc7\u6ee4\u3001\u6620\u5c04\u3001\u805a\u5408\u7b49&#xff09;&#xff0c;\u6ee1\u8db3\u5404\u79cd\u5904\u7406\u9700\u6c42\u3002<\/li>\n<\/ul>\n<h3>\u4e8c\u3001Stream\u7684\u521b\u5efa&#xff1a;\u4ece\u4e0d\u540c\u6570\u636e\u6e90\u751f\u6210\u6d41<\/h3>\n<p>\u5728\u4f7f\u7528Stream\u4e4b\u524d&#xff0c;\u6211\u4eec\u9700\u8981\u5148\u521b\u5efa\u5b83\u3002Stream\u53ef\u4ee5\u4ece\u591a\u79cd\u6570\u636e\u6e90\u751f\u6210&#xff0c;\u6700\u5e38\u89c1\u7684\u5305\u62ec\u96c6\u5408\u3001\u6570\u7ec4\u3001\u503c\u5e8f\u5217\u7b49\u3002<\/p>\n<h4>1. \u4ece\u96c6\u5408\u521b\u5efaStream<\/h4>\n<p>Java\u96c6\u5408\u6846\u67b6&#xff08;Collection&#xff09;\u5728Java 8\u4e2d\u65b0\u589e\u4e86\u4e24\u4e2a\u65b9\u6cd5\u7528\u4e8e\u521b\u5efaStream&#xff1a;<\/p>\n<ul>\n<li>stream()&#xff1a;\u8fd4\u56de\u4e00\u4e2a\u987a\u5e8f\u6d41&#xff08;\u4e32\u884c\u5904\u7406&#xff09;\u3002<\/li>\n<li>parallelStream()&#xff1a;\u8fd4\u56de\u4e00\u4e2a\u5e76\u884c\u6d41&#xff08;\u591a\u7ebf\u7a0b\u5e76\u884c\u5904\u7406&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b1&#xff1a;\u4ece\u96c6\u5408\u521b\u5efaStream<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">StreamCreation<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruits <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521b\u5efa\u987a\u5e8f\u6d41<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sequentialStream <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u521b\u5efa\u5e76\u884c\u6d41<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> parallelStream <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6253\u5370\u6d41\u4e2d\u7684\u5143\u7d20&#xff08;\u7ec8\u7aef\u64cd\u4f5c&#xff09;<\/span><br \/>\n        sequentialStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8211; \u5e76\u884c\u6d41 &#8212;&#8211;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        parallelStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff1a;<\/p>\n<p>apple<br \/>\nbanana<br \/>\norange<br \/>\ngrape<br \/>\n&#8212;&#8211; \u5e76\u884c\u6d41 &#8212;&#8211;<br \/>\norange<br \/>\ngrape<br \/>\napple<br \/>\nbanana<\/p>\n<p>\u6ce8\u610f&#xff1a;\u5e76\u884c\u6d41\u7684\u8f93\u51fa\u987a\u5e8f\u53ef\u80fd\u4e0e\u6e90\u96c6\u5408\u4e0d\u540c&#xff0c;\u56e0\u4e3a\u591a\u7ebf\u7a0b\u5904\u7406\u7684\u987a\u5e8f\u4e0d\u786e\u5b9a\u3002<\/p>\n<h4>2. \u4ece\u6570\u7ec4\u521b\u5efaStream<\/h4>\n<p>Arrays\u7c7b\u63d0\u4f9b\u4e86stream()\u65b9\u6cd5&#xff0c;\u53ef\u4ee5\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3aStream&#xff1a;<\/p>\n<p>\u793a\u4f8b2&#xff1a;\u4ece\u6570\u7ec4\u521b\u5efaStream<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IntStream<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ArrayToStream<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5bf9\u8c61\u6570\u7ec4<\/span><br \/>\n        <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> animals <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token string\">&#034;cat&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;dog&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;bird&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;fish&#034;<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> animalStream <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span>animals<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        animalStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u57fa\u672c\u7c7b\u578b\u6570\u7ec4&#xff08;int&#xff09;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">IntStream<\/span> numberStream <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span>numbers<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        numberStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u622a\u53d6\u6570\u7ec4\u7684\u4e00\u90e8\u5206\u521b\u5efaStream&#xff08;\u4ece\u7d22\u5f151\u52304&#xff0c;\u4e0d\u5305\u542b4&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">IntStream<\/span> rangeStream <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span>numbers<span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        rangeStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;2, 3, 4<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>Java 8\u4e3a\u57fa\u672c\u7c7b\u578b&#xff08;int\u3001long\u3001double&#xff09;\u63d0\u4f9b\u4e86\u4e13\u95e8\u7684Stream\u7c7b\u578b&#xff08;IntStream\u3001LongStream\u3001DoubleStream&#xff09;&#xff0c;\u907f\u514d\u4e86\u81ea\u52a8\u88c5\u7bb1\/\u62c6\u7bb1\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n<h4>3. \u4ece\u503c\u5e8f\u5217\u521b\u5efaStream<\/h4>\n<p>Stream\u7c7b\u7684\u9759\u6001\u65b9\u6cd5of()\u53ef\u4ee5\u76f4\u63a5\u4ece\u4e00\u7cfb\u5217\u503c\u521b\u5efaStream&#xff1a;<\/p>\n<p>\u793a\u4f8b3&#xff1a;\u4ece\u503c\u5e8f\u5217\u521b\u5efaStream<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ValuesToStream<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5355\u4e2a\u503c<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> singleValueStream <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">of<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        singleValueStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u591a\u4e2a\u503c<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbersStream <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">of<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        numbersStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7a7aStream<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> emptyStream <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">empty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7a7aStream\u7684\u5143\u7d20\u6570\u91cf&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> emptyStream<span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;0<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4. \u4ece\u751f\u6210\u5668\u521b\u5efa\u65e0\u9650Stream<\/h4>\n<p>Stream\u63d0\u4f9b\u4e86\u4e24\u4e2a\u9759\u6001\u65b9\u6cd5\u7528\u4e8e\u521b\u5efa\u65e0\u9650\u6d41&#xff08;\u5143\u7d20\u53ef\u4ee5\u65e0\u9650\u751f\u6210&#xff09;&#xff0c;\u901a\u5e38\u9700\u8981\u914d\u5408limit()\u65b9\u6cd5\u9650\u5236\u5143\u7d20\u6570\u91cf&#xff1a;<\/p>\n<ul>\n<li>generate(Supplier&lt;T&gt; s)&#xff1a;\u901a\u8fc7Supplier\u751f\u6210\u65e0\u9650\u6d41&#xff0c;\u5143\u7d20\u65e0\u5e8f\u3002<\/li>\n<li>iterate(T seed, UnaryOperator&lt;T&gt; f)&#xff1a;\u4ece\u521d\u59cb\u503c\u5f00\u59cb&#xff0c;\u901a\u8fc7UnaryOperator\u8fed\u4ee3\u751f\u6210\u65e0\u9650\u6d41&#xff0c;\u5143\u7d20\u6709\u5e8f\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b4&#xff1a;\u521b\u5efa\u65e0\u9650Stream<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Random<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">InfiniteStream<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 1. \u4f7f\u7528generate()\u751f\u6210\u968f\u673a\u6570&#xff08;\u9650\u523610\u4e2a&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">Random<\/span> random <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Random<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Double<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> randomNumbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">generate<\/span><span class=\"token punctuation\">(<\/span>random<span class=\"token operator\">::<\/span><span class=\"token function\">nextDouble<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">limit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        randomNumbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>num <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%.2f &#034;<\/span><span class=\"token punctuation\">,<\/span> num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. \u4f7f\u7528iterate()\u751f\u6210\u81ea\u7136\u6570\u5e8f\u5217&#xff08;\u9650\u523610\u4e2a&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> naturalNumbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">iterate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> n <span class=\"token operator\">-&gt;<\/span> n <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">limit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        naturalNumbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>num <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>num <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 3. \u4f7f\u7528iterate()\u751f\u6210\u6590\u6ce2\u90a3\u5951\u6570\u5217&#xff08;\u9650\u523610\u4e2a&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">iterate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> fib <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">{<\/span>fib<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">,<\/span> fib<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;<\/span> fib<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">limit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>fib <span class=\"token operator\">-&gt;<\/span> fib<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u63d0\u53d6\u6570\u5217\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>num <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>num <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;0 1 1 2 3 5 8 13 21 34<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u65e0\u9650\u6d41\u5fc5\u987b\u914d\u5408limit()\u7b49\u65b9\u6cd5\u4f7f\u7528&#xff0c;\u5426\u5219\u7ec8\u7aef\u64cd\u4f5c\u4f1a\u9677\u5165\u65e0\u9650\u5faa\u73af\u3002<\/p>\n<h4>5. \u4ece\u6587\u4ef6\u521b\u5efaStream<\/h4>\n<p>Java NIO\u7684Files\u7c7b\u63d0\u4f9b\u4e86lines()\u65b9\u6cd5&#xff0c;\u53ef\u4ee5\u5c06\u6587\u4ef6\u7684\u6bcf\u4e00\u884c\u4f5c\u4e3aStream\u7684\u5143\u7d20&#xff1a;<\/p>\n<p>\u793a\u4f8b5&#xff1a;\u4ece\u6587\u4ef6\u521b\u5efaStream<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>io<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IOException<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>nio<span class=\"token punctuation\">.<\/span>file<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Files<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>nio<span class=\"token punctuation\">.<\/span>file<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Paths<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Stream<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FileToStream<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u4e3aStream&#xff08;\u6bcf\u884c\u4e00\u4e2a\u5143\u7d20&#xff09;<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> lines <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Files<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">lines<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Paths<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;example.txt&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u7edf\u8ba1\u6587\u4ef6\u884c\u6570<\/span><br \/>\n            <span class=\"token keyword\">long<\/span> lineCount <span class=\"token operator\">&#061;<\/span> lines<span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6587\u4ef6\u884c\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> lineCount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8fc7\u6ee4\u5305\u542b\u7279\u5b9a\u5173\u952e\u5b57\u7684\u884c<\/span><br \/>\n        <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> lines <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Files<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">lines<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Paths<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;example.txt&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            lines<span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>line <span class=\"token operator\">-&gt;<\/span> line<span class=\"token punctuation\">.<\/span><span class=\"token function\">contains<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;java&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                 <span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">IOException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u4f7f\u7528Files.lines()\u65f6\u5e94\u5c06Stream\u653e\u5728try-with-resources\u8bed\u53e5\u4e2d&#xff0c;\u786e\u4fdd\u8d44\u6e90\u6b63\u786e\u5173\u95ed\u3002<\/p>\n<h3>\u4e09\u3001Stream\u7684\u64cd\u4f5c&#xff1a;\u4e2d\u95f4\u64cd\u4f5c\u4e0e\u7ec8\u7aef\u64cd\u4f5c<\/h3>\n<p>Stream\u7684\u64cd\u4f5c\u53ef\u4ee5\u5206\u4e3a\u4e24\u5927\u7c7b&#xff1a;\u4e2d\u95f4\u64cd\u4f5c&#xff08;Intermediate Operations&#xff09; \u548c\u7ec8\u7aef\u64cd\u4f5c&#xff08;Terminal Operations&#xff09;\u3002\u7406\u89e3\u8fd9\u4e24\u7c7b\u64cd\u4f5c\u7684\u533a\u522b\u662f\u638c\u63e1Stream API\u7684\u5173\u952e\u3002<\/p>\n<h4>1. \u64cd\u4f5c\u7c7b\u578b\u6982\u8ff0<\/h4>\n<ul>\n<li>\u4e2d\u95f4\u64cd\u4f5c&#xff1a;\u5bf9Stream\u8fdb\u884c\u5904\u7406\u540e\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684Stream&#xff0c;\u652f\u6301\u94fe\u5f0f\u8c03\u7528\u3002\u4e2d\u95f4\u64cd\u4f5c\u662f\u60f0\u6027\u7684&#xff0c;\u4e0d\u4f1a\u7acb\u5373\u6267\u884c&#xff0c;\u53ea\u6709\u5f53\u7ec8\u7aef\u64cd\u4f5c\u88ab\u8c03\u7528\u65f6\u624d\u4f1a\u89e6\u53d1\u8ba1\u7b97\u3002<\/li>\n<li>\u7ec8\u7aef\u64cd\u4f5c&#xff1a;\u89e6\u53d1Stream\u7684\u8ba1\u7b97\u5e76\u4ea7\u751f\u4e00\u4e2a\u7ed3\u679c&#xff08;\u6216\u526f\u4f5c\u7528&#xff09;&#xff0c;\u4e4b\u540eStream\u4fbf\u4e0d\u53ef\u518d\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<p>Stream\u64cd\u4f5c\u6d41\u6c34\u7ebf\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> result <span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>       <span class=\"token comment\">\/\/ \u521b\u5efaStream&#xff08;\u6e90&#xff09;<\/span><br \/>\n                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">-&gt;<\/span> s<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span>  <span class=\"token comment\">\/\/ \u4e2d\u95f4\u64cd\u4f5c&#xff1a;\u8fc7\u6ee4<\/span><br \/>\n                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">toUpperCase<\/span><span class=\"token punctuation\">)<\/span>     <span class=\"token comment\">\/\/ \u4e2d\u95f4\u64cd\u4f5c&#xff1a;\u8f6c\u6362<\/span><br \/>\n                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>                     <span class=\"token comment\">\/\/ \u4e2d\u95f4\u64cd\u4f5c&#xff1a;\u6392\u5e8f<\/span><br \/>\n                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ec8\u7aef\u64cd\u4f5c&#xff1a;\u6536\u96c6\u7ed3\u679c<\/span><\/p>\n<h4>2. \u5e38\u7528\u4e2d\u95f4\u64cd\u4f5c<\/h4>\n<h5>\u8fc7\u6ee4&#xff08;filter&#xff09;<\/h5>\n<p>filter(Predicate&lt;T&gt; predicate)&#xff1a;\u4fdd\u7559\u6ee1\u8db3Predicate\u6761\u4ef6\u7684\u5143\u7d20\u3002<\/p>\n<p>\u793a\u4f8b6&#xff1a;\u8fc7\u6ee4\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FilterExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8fc7\u6ee4\u51fa\u5076\u6570<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> evenNumbers <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">-&gt;<\/span> n <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5076\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> evenNumbers<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[2, 4, 6, 8, 10]<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruits <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;kiwi&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8fc7\u6ee4\u51fa\u957f\u5ea6\u5927\u4e8e5\u7684\u6c34\u679c\u540d\u79f0<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> longNames <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>fruit <span class=\"token operator\">-&gt;<\/span> fruit<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u540d\u79f0\u957f\u5ea6\u5927\u4e8e5\u7684\u6c34\u679c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> longNames<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[banana, orange]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u6620\u5c04&#xff08;map&#xff09;<\/h5>\n<p>map(Function&lt;T, R&gt; mapper)&#xff1a;\u5c06Stream\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u901a\u8fc7Function\u8f6c\u6362\u4e3a\u53e6\u4e00\u79cd\u7c7b\u578b&#xff0c;\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u8f6c\u6362\u540e\u5143\u7d20\u7684\u65b0Stream\u3002<\/p>\n<p>\u793a\u4f8b7&#xff1a;\u6620\u5c04\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MapExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;world&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;java&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;stream&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5176\u957f\u5ea6<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> wordLengths <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                         <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                         <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5355\u8bcd\u957f\u5ea6&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> wordLengths<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[5, 5, 4, 6]<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5c06\u6bcf\u4e2a\u6570\u5b57\u5e73\u65b9<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> squares <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">-&gt;<\/span> n <span class=\"token operator\">*<\/span> n<span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e73\u65b9\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> squares<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[1, 4, 9, 16, 25]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578bStream&#xff08;\u5982IntStream&#xff09;&#xff0c;\u53ef\u4ee5\u4f7f\u7528mapToInt()\u3001mapToLong()\u3001mapToDouble()\u7b49\u65b9\u6cd5\u907f\u514d\u81ea\u52a8\u88c5\u7bb1&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PrimitiveMapExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;world&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;java&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;stream&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8ba1\u7b97\u6240\u6709\u5355\u8bcd\u7684\u603b\u957f\u5ea6&#xff08;\u4f7f\u7528mapToInt\u907f\u514d\u88c5\u7bb1&#xff09;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> totalLength <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                               <span class=\"token punctuation\">.<\/span><span class=\"token function\">mapToInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                               <span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ IntStream\u7684sum()\u65b9\u6cd5<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u603b\u957f\u5ea6&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> totalLength<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;20<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u6241\u5e73\u5316\u6620\u5c04&#xff08;flatMap&#xff09;<\/h5>\n<p>flatMap(Function&lt;T, Stream&lt;R&gt;&gt; mapper)&#xff1a;\u5c06\u6bcf\u4e2a\u5143\u7d20\u8f6c\u6362\u4e3a\u4e00\u4e2aStream&#xff0c;\u7136\u540e\u5c06\u6240\u6709Stream\u5408\u5e76\u4e3a\u4e00\u4e2aStream&#xff08;\u6241\u5e73\u5316&#xff09;\u3002\u5e38\u7528\u4e8e\u5904\u7406\u5d4c\u5957\u96c6\u5408\u3002<\/p>\n<p>\u793a\u4f8b8&#xff1a;flatMap\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FlatMapExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5d4c\u5957\u96c6\u5408&#xff1a;\u5217\u8868\u7684\u5217\u8868<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528flatMap\u5c06\u5d4c\u5957\u5217\u8868\u8f6c\u6362\u4e3a\u6241\u5e73\u5217\u8868<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> flatNumbers <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">flatMap<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">List<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u5c06\u6bcf\u4e2a\u5b50\u5217\u8868\u8f6c\u6362\u4e3aStream<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6241\u5e73\u5316\u540e\u7684\u5217\u8868&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> flatNumbers<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[1, 2, 3, 4, 5, 6, 7, 8, 9]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5904\u7406\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;world&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u63d0\u53d6\u6240\u6709\u4e0d\u91cd\u590d\u7684\u5b57\u7b26<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> uniqueChars <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">flatMap<\/span><span class=\"token punctuation\">(<\/span>word <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                                               <span class=\"token comment\">\/\/ \u5c06\u6bcf\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u5b57\u7b26Stream<\/span><br \/>\n                                               <span class=\"token keyword\">char<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> chars <span class=\"token operator\">&#061;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">toCharArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                                               <span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> characters <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Character<\/span><span class=\"token punctuation\">[<\/span>chars<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                                               <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> chars<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                                                   characters<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> chars<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                                               <span class=\"token punctuation\">}<\/span><br \/>\n                                               <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span>characters<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                                           <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">distinct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u53bb\u91cd<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span>   <span class=\"token comment\">\/\/ \u6392\u5e8f<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6240\u6709\u4e0d\u91cd\u590d\u7684\u5b57\u7b26&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> uniqueChars<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[d, e, h, l, o, r, w]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>flatMap\u4e0emap\u7684\u533a\u522b&#xff1a;map\u5c06\u4e00\u4e2a\u5143\u7d20\u8f6c\u6362\u4e3a\u4e00\u4e2a\u65b0\u5143\u7d20&#xff0c;flatMap\u5c06\u4e00\u4e2a\u5143\u7d20\u8f6c\u6362\u4e3a\u591a\u4e2a\u5143\u7d20&#xff08;\u901a\u8fc7Stream&#xff09;\u3002<\/p>\n<h5>\u6392\u5e8f&#xff08;sorted&#xff09;<\/h5>\n<p>sorted()&#xff1a;\u4f7f\u7528\u81ea\u7136\u987a\u5e8f\u5bf9\u5143\u7d20\u6392\u5e8f&#xff08;\u8981\u6c42\u5143\u7d20\u5b9e\u73b0Comparable\u63a5\u53e3&#xff09;\u3002<br \/>\nsorted(Comparator&lt;T&gt; comparator)&#xff1a;\u4f7f\u7528\u81ea\u5b9a\u4e49\u6bd4\u8f83\u5668\u6392\u5e8f\u3002<\/p>\n<p>\u793a\u4f8b9&#xff1a;\u6392\u5e8f\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SortedExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u81ea\u7136\u6392\u5e8f&#xff08;\u5347\u5e8f&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sortedNatural <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                             <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                             <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u81ea\u7136\u6392\u5e8f&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sortedNatural<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[1, 1, 2, 3, 4, 5, 6, 9]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u6392\u5e8f&#xff08;\u964d\u5e8f&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sortedDescending <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">reverseOrder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u964d\u5e8f\u6392\u5e8f&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sortedDescending<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[9, 6, 5, 4, 3, 2, 1, 1]<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6309\u5b57\u7b26\u4e32\u957f\u5ea6\u6392\u5e8f&#xff08;\u77ed\u5230\u957f&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sortedByLength <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">comparingInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6309\u957f\u5ea6\u6392\u5e8f&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sortedByLength<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[apple, grape, banana, orange]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6309\u5b57\u7b26\u4e32\u957f\u5ea6\u5012\u5e8f&#xff0c;\u957f\u5ea6\u76f8\u540c\u5219\u6309\u5b57\u6bcd\u987a\u5e8f<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sortedComplex <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                         <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">comparingInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">reversed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">thenComparing<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">naturalOrder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                         <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u590d\u6742\u6392\u5e8f&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sortedComplex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[banana, orange, apple, grape]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u53bb\u91cd&#xff08;distinct&#xff09;<\/h5>\n<p>distinct()&#xff1a;\u6839\u636e\u5143\u7d20\u7684equals()\u65b9\u6cd5\u53bb\u9664\u91cd\u590d\u5143\u7d20\u3002<\/p>\n<p>\u793a\u4f8b10&#xff1a;\u53bb\u91cd\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DistinctExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u53bb\u9664\u91cd\u590d\u6570\u5b57<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> uniqueNumbers <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                            <span class=\"token punctuation\">.<\/span><span class=\"token function\">distinct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                            <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u53bb\u91cd\u540e\u7684\u6570\u5b57&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> uniqueNumbers<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[1, 2, 3, 4, 5]<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u53bb\u9664\u91cd\u590d\u5b57\u7b26\u4e32<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> uniqueWords <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">distinct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u53bb\u91cd\u540e\u7684\u5355\u8bcd&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> uniqueWords<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[apple, banana, orange]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u9650\u5236\u4e0e\u8df3\u8fc7&#xff08;limit\/skip&#xff09;<\/h5>\n<ul>\n<li>limit(long maxSize)&#xff1a;\u4fdd\u7559Stream\u4e2d\u7684\u524dmaxSize\u4e2a\u5143\u7d20\u3002<\/li>\n<li>skip(long n)&#xff1a;\u8df3\u8fc7Stream\u4e2d\u7684\u524dn\u4e2a\u5143\u7d20\u3002<\/li>\n<\/ul>\n<p>\u793a\u4f8b11&#xff1a;limit\u4e0eskip\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">IntStream<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">LimitSkipExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u751f\u62101-20\u7684\u6570\u5b57<\/span><br \/>\n        <span class=\"token class-name\">IntStream<\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">IntStream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">rangeClosed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u53d6\u524d10\u4e2a\u6570\u5b57<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> first10 <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">limit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                      <span class=\"token punctuation\">.<\/span><span class=\"token function\">boxed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u5c06IntStream\u8f6c\u6362\u4e3aStream&lt;Integer&gt;<\/span><br \/>\n                                      <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u524d10\u4e2a\u6570\u5b57&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> first10<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[1, 2, &#8230;, 10]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u751f\u62101-20\u7684\u6570\u5b57&#xff08;\u91cd\u65b0\u751f\u6210&#xff0c;\u56e0\u4e3a\u4e0a\u4e00\u4e2aStream\u5df2\u88ab\u6d88\u8d39&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">IntStream<\/span> numbers2 <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">IntStream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">rangeClosed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8df3\u8fc7\u524d10\u4e2a&#xff0c;\u53d6\u5269\u4e0b\u7684<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> after10 <span class=\"token operator\">&#061;<\/span> numbers2<span class=\"token punctuation\">.<\/span><span class=\"token function\">skip<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">boxed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;10\u4e4b\u540e\u7684\u6570\u5b57&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> after10<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[11, 12, &#8230;, 20]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5206\u9875\u793a\u4f8b&#xff1a;\u53d6\u7b2c2\u9875&#xff0c;\u6bcf\u98755\u6761\u6570\u636e&#xff08;\u8df3\u8fc7\u524d5\u6761&#xff0c;\u53d65\u6761&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> page2 <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">IntStream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">rangeClosed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                      <span class=\"token punctuation\">.<\/span><span class=\"token function\">skip<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                      <span class=\"token punctuation\">.<\/span><span class=\"token function\">limit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                      <span class=\"token punctuation\">.<\/span><span class=\"token function\">boxed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                      <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b2c2\u9875\u6570\u636e&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> page2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[6, 7, 8, 9, 10]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u5e38\u7528\u7ec8\u7aef\u64cd\u4f5c<\/h4>\n<h5>\u904d\u5386&#xff08;forEach&#xff09;<\/h5>\n<p>forEach(Consumer&lt;T&gt; action)&#xff1a;\u5bf9Stream\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6267\u884cConsumer\u64cd\u4f5c&#xff08;\u7ec8\u7aef\u64cd\u4f5c&#xff0c;\u65e0\u8fd4\u56de\u503c&#xff09;\u3002<\/p>\n<p>\u793a\u4f8b12&#xff1a;forEach\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ForEachExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruits <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u904d\u5386\u5e76\u6253\u5370\u5143\u7d20<\/span><br \/>\n        fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5e76\u884c\u6d41\u7684forEach\u53ef\u80fd\u4e71\u5e8f<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8211; \u5e76\u884c\u6d41\u904d\u5386 &#8212;&#8211;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ forEachOrdered&#xff1a;\u4fdd\u8bc1\u987a\u5e8f&#xff08;\u5373\u4f7f\u662f\u5e76\u884c\u6d41&#xff09;&#xff0c;\u4f46\u53ef\u80fd\u964d\u4f4e\u5e76\u884c\u6548\u7387<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8211; \u5e76\u884c\u6d41\u6709\u5e8f\u904d\u5386 &#8212;&#8211;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">forEachOrdered<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5e76\u884c\u6d41\u4e2dforEach()\u4e0d\u4fdd\u8bc1\u5143\u7d20\u5904\u7406\u987a\u5e8f&#xff0c;forEachOrdered()\u53ef\u4ee5\u4fdd\u8bc1\u987a\u5e8f\u4f46\u53ef\u80fd\u635f\u5931\u5e76\u884c\u6027\u80fd\u3002<\/p>\n<h5>\u6536\u96c6&#xff08;collect&#xff09;<\/h5>\n<p>collect(Collector&lt;T, A, R&gt; collector)&#xff1a;\u5c06Stream\u4e2d\u7684\u5143\u7d20\u6536\u96c6\u5230\u5bb9\u5668\u4e2d&#xff08;\u5982List\u3001Set\u3001Map\u7b49&#xff09;&#xff0c;\u662f\u6700\u5e38\u7528\u7684\u7ec8\u7aef\u64cd\u4f5c\u4e4b\u4e00\u3002Collectors\u5de5\u5177\u7c7b\u63d0\u4f9b\u4e86\u5927\u91cf\u9884\u5b9a\u4e49\u7684Collector\u3002<\/p>\n<p>\u793a\u4f8b13&#xff1a;collect\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Set<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CollectExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruits <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6536\u96c6\u5230List<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruitList <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;List: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> fruitList<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6536\u96c6\u5230Set&#xff08;\u81ea\u52a8\u53bb\u91cd&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruitSet <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                     <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toSet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Set: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> fruitSet<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6536\u96c6\u5230\u6307\u5b9a\u7684\u96c6\u5408&#xff08;\u5982LinkedList&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> linkedList <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toCollection<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span>LinkedList<\/span><span class=\"token operator\">::<\/span><span class=\"token keyword\">new<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;LinkedList: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> linkedList<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6536\u96c6\u5230Map&#xff08;\u952e\u4e3a\u5143\u7d20&#xff0c;\u503c\u4e3a\u957f\u5ea6&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruitLengthMap <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                   <span class=\"token punctuation\">.<\/span><span class=\"token function\">distinct<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u53bb\u91cd&#xff0c;\u907f\u514d\u952e\u51b2\u7a81<\/span><br \/>\n                                                   <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toMap<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                                                       fruit <span class=\"token operator\">-&gt;<\/span> fruit<span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ \u952e\u6620\u5c04<\/span><br \/>\n                                                       <span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">length<\/span>   <span class=\"token comment\">\/\/ \u503c\u6620\u5c04<\/span><br \/>\n                                                   <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6c34\u679c\u957f\u5ea6Map: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> fruitLengthMap<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u8ba1\u6570&#xff08;count&#xff09;<\/h5>\n<p>count()&#xff1a;\u8fd4\u56deStream\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<\/p>\n<p>\u793a\u4f8b14&#xff1a;count\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CountExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruits <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7edf\u8ba1\u5143\u7d20\u603b\u6570<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> total <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5143\u7d20\u603b\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> total<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;4<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7edf\u8ba1\u957f\u5ea6\u5927\u4e8e5\u7684\u5143\u7d20\u6570\u91cf<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> longNamesCount <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                   <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>fruit <span class=\"token operator\">-&gt;<\/span> fruit<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                   <span class=\"token punctuation\">.<\/span><span class=\"token function\">count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u957f\u5ea6\u5927\u4e8e5\u7684\u5143\u7d20\u6570\u91cf&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> longNamesCount<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;2<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u5339\u914d&#xff08;anyMatch\/allMatch\/noneMatch&#xff09;<\/h5>\n<ul>\n<li>anyMatch(Predicate&lt;T&gt; predicate)&#xff1a;\u5224\u65ad\u662f\u5426\u81f3\u5c11\u6709\u4e00\u4e2a\u5143\u7d20\u6ee1\u8db3Predicate\u3002<\/li>\n<li>allMatch(Predicate&lt;T&gt; predicate)&#xff1a;\u5224\u65ad\u662f\u5426\u6240\u6709\u5143\u7d20\u90fd\u6ee1\u8db3Predicate\u3002<\/li>\n<li>noneMatch(Predicate&lt;T&gt; predicate)&#xff1a;\u5224\u65ad\u662f\u5426\u6240\u6709\u5143\u7d20\u90fd\u4e0d\u6ee1\u8db3Predicate\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e9b\u64cd\u4f5c\u90fd\u662f\u77ed\u8def\u64cd\u4f5c&#xff0c;\u4e00\u65e6\u786e\u5b9a\u7ed3\u679c\u5c31\u4f1a\u505c\u6b62\u8ba1\u7b97&#xff08;\u5982anyMatch\u627e\u5230\u4e00\u4e2a\u5339\u914d\u5143\u7d20\u5c31\u8fd4\u56detrue&#xff09;\u3002<\/p>\n<p>\u793a\u4f8b15&#xff1a;\u5339\u914d\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MatchExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u662f\u5426\u5b58\u5728\u5076\u6570&#xff08;\u5b9e\u9645\u4e0a\u90fd\u662f\u5076\u6570&#xff09;<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> hasEven <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">anyMatch<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">-&gt;<\/span> n <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u662f\u5426\u5b58\u5728\u5076\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> hasEven<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;true<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u662f\u5426\u6240\u6709\u5143\u7d20\u90fd\u662f\u5076\u6570<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> allEven <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">allMatch<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">-&gt;<\/span> n <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u662f\u5426\u6240\u6709\u5143\u7d20\u90fd\u662f\u5076\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> allEven<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;true<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u662f\u5426\u6ca1\u6709\u5947\u6570<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> noOdd <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">noneMatch<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">-&gt;<\/span> n <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u662f\u5426\u6ca1\u6709\u5947\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> noOdd<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;true<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u662f\u5426\u5b58\u5728\u4ee5&#034;a&#034;\u5f00\u5934\u7684\u5355\u8bcd<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> hasStartWithA <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">anyMatch<\/span><span class=\"token punctuation\">(<\/span>word <span class=\"token operator\">-&gt;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">startsWith<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;a&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u662f\u5426\u5b58\u5728\u4ee5&#039;a&#039;\u5f00\u5934\u7684\u5355\u8bcd&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> hasStartWithA<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;true<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u662f\u5426\u6240\u6709\u5355\u8bcd\u957f\u5ea6\u90fd\u5927\u4e8e3<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> allLongerThan3 <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">allMatch<\/span><span class=\"token punctuation\">(<\/span>word <span class=\"token operator\">-&gt;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u662f\u5426\u6240\u6709\u5355\u8bcd\u957f\u5ea6\u90fd\u5927\u4e8e3&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> allLongerThan3<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;true<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u67e5\u627e&#xff08;findFirst\/findAny&#xff09;<\/h5>\n<ul>\n<li>findFirst()&#xff1a;\u8fd4\u56deStream\u4e2d\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff08;\u5c01\u88c5\u5728Optional\u4e2d&#xff09;\u3002<\/li>\n<li>findAny()&#xff1a;\u8fd4\u56deStream\u4e2d\u7684\u4efb\u610f\u4e00\u4e2a\u5143\u7d20&#xff08;\u5c01\u88c5\u5728Optional\u4e2d&#xff09;\u3002<\/li>\n<\/ul>\n<p>findFirst()\u5728\u987a\u5e8f\u6d41\u4e2d\u603b\u662f\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff0c;\u5728\u5e76\u884c\u6d41\u4e2d\u4e5f\u4f1a\u5c3d\u91cf\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff0c;\u4f46findAny()\u5728\u5e76\u884c\u6d41\u4e2d\u53ef\u80fd\u8fd4\u56de\u4efb\u610f\u5143\u7d20&#xff0c;\u6027\u80fd\u66f4\u597d\u3002<\/p>\n<p>\u793a\u4f8b16&#xff1a;\u67e5\u627e\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Optional<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">FindExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruits <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u67e5\u627e\u7b2c\u4e00\u4e2a\u5143\u7d20<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> first <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">findFirst<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        first<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>fruit <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> fruit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;apple<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u67e5\u627e\u4efb\u610f\u4e00\u4e2a\u957f\u5ea6\u5927\u4e8e5\u7684\u5143\u7d20<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> anyLong <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                         <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>fruit <span class=\"token operator\">-&gt;<\/span> fruit<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                         <span class=\"token punctuation\">.<\/span><span class=\"token function\">findAny<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        anyLong<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>fruit <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u957f\u5ea6\u5927\u4e8e5\u7684\u5143\u7d20&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> fruit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53ef\u80fd\u662fbanana\u6216orange<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5e76\u884c\u6d41\u4e2dfindAny()\u53ef\u80fd\u8fd4\u56de\u4e0d\u540c\u7ed3\u679c<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#8212;&#8211; \u5e76\u884c\u6d41\u67e5\u627e &#8212;&#8211;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> parallelAny <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>fruit <span class=\"token operator\">-&gt;<\/span> fruit<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                <span class=\"token punctuation\">.<\/span><span class=\"token function\">findAny<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            parallelAny<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>fruit <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">print<\/span><span class=\"token punctuation\">(<\/span>fruit <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u6700\u503c&#xff08;max\/min&#xff09;<\/h5>\n<p>max(Comparator&lt;T&gt; comparator)&#xff1a;\u6839\u636e\u6bd4\u8f83\u5668\u8fd4\u56deStream\u4e2d\u7684\u6700\u5927\u503c\u3002<br \/>\nmin(Comparator&lt;T&gt; comparator)&#xff1a;\u6839\u636e\u6bd4\u8f83\u5668\u8fd4\u56deStream\u4e2d\u7684\u6700\u5c0f\u503c\u3002<\/p>\n<p>\u793a\u4f8b17&#xff1a;max\u4e0emin\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Optional<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">MaxMinExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u67e5\u627e\u6700\u5927\u503c<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> maxNumber <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                            <span class=\"token punctuation\">.<\/span><span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">naturalOrder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        maxNumber<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>max <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u5927\u503c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> max<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;9<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u67e5\u627e\u6700\u5c0f\u503c<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> minNumber <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                            <span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">naturalOrder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        minNumber<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>min <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u5c0f\u503c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> min<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;1<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u67e5\u627e\u6700\u957f\u7684\u5355\u8bcd<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> longestWord <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">comparingInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        longestWord<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>word <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u957f\u7684\u5355\u8bcd&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> word<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;banana\u6216orange&#xff08;\u957f\u5ea6\u76f8\u540c&#xff09;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u67e5\u627e\u6700\u77ed\u7684\u5355\u8bcd<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> shortestWord <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                            <span class=\"token punctuation\">.<\/span><span class=\"token function\">min<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">comparingInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        shortestWord<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>word <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u77ed\u7684\u5355\u8bcd&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> word<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;apple\u6216grape&#xff08;\u957f\u5ea6\u76f8\u540c&#xff09;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u5f52\u7ea6&#xff08;reduce&#xff09;<\/h5>\n<p>reduce()&#xff1a;\u5c06Stream\u4e2d\u7684\u5143\u7d20\u901a\u8fc7\u7d2f\u52a0\u5668&#xff08;Accumulator&#xff09;\u5f52\u7ea6\u4e3a\u5355\u4e2a\u503c\u3002\u6709\u4e09\u79cd\u91cd\u8f7d\u5f62\u5f0f&#xff1a;<\/p>\n<li>reduce(T identity, BinaryOperator&lt;T&gt; accumulator)&#xff1a;\u4ee5identity\u4e3a\u521d\u59cb\u503c&#xff0c;\u901a\u8fc7accumulator\u7d2f\u52a0\u5143\u7d20\u3002<\/li>\n<li>reduce(BinaryOperator&lt;T&gt; accumulator)&#xff1a;\u65e0\u521d\u59cb\u503c&#xff0c;\u8fd4\u56deOptional&#xff08;\u53ef\u80fd\u4e3a\u7a7a&#xff09;\u3002<\/li>\n<li>reduce(U identity, BiFunction&lt;U, ? super T, U&gt; accumulator, BinaryOperator&lt;U&gt; combiner)&#xff1a;\u7528\u4e8e\u5e76\u884c\u6d41\u7684\u5f52\u7ea6&#xff0c;combiner\u7528\u4e8e\u5408\u5e76\u591a\u4e2a\u7ebf\u7a0b\u7684\u7ed3\u679c\u3002<\/li>\n<p>\u793a\u4f8b18&#xff1a;reduce\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Optional<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ReduceExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 1. \u6709\u521d\u59cb\u503c\u7684\u6c42\u548c&#xff08;\u521d\u59cb\u503c\u4e3a0&#xff09;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> sumWithIdentity <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                     <span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6c42\u548c&#xff08;\u6709\u521d\u59cb\u503c&#xff09;&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sumWithIdentity<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;15<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. \u65e0\u521d\u59cb\u503c\u7684\u6c42\u548c&#xff08;\u53ef\u80fd\u4e3a\u7a7a&#xff0c;\u8fd4\u56deOptional&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> sumWithoutIdentity <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                     <span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        sumWithoutIdentity<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>sum <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6c42\u548c&#xff08;\u65e0\u521d\u59cb\u503c&#xff09;&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sum<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;15<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 3. \u6c42\u4e58\u79ef<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> product <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                             <span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> a <span class=\"token operator\">*<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e58\u79ef&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> product<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;120<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 4. \u62fc\u63a5\u5b57\u7b26\u4e32<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034; &#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;World&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> sentence <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                               <span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">concat<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u62fc\u63a5\u7ed3\u679c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sentence<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;Hello World!<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 5. \u5e76\u884c\u6d41\u7684\u5f52\u7ea6&#xff08;\u4f7f\u7528combiner&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> largeNumbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> parallelSum <span class=\"token operator\">&#061;<\/span> largeNumbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                      <span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                                          <span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span>                <span class=\"token comment\">\/\/ \u521d\u59cb\u503c<\/span><br \/>\n                                          <span class=\"token class-name\">Integer<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">,<\/span>     <span class=\"token comment\">\/\/ \u7d2f\u52a0\u5668&#xff08;\u7ebf\u7a0b\u5185\u5f52\u7ea6&#xff09;<\/span><br \/>\n                                          <span class=\"token class-name\">Integer<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">sum<\/span>      <span class=\"token comment\">\/\/ \u7ec4\u5408\u5668&#xff08;\u5408\u5e76\u7ebf\u7a0b\u7ed3\u679c&#xff09;<\/span><br \/>\n                                      <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e76\u884c\u6d41\u6c42\u548c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> parallelSum<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;55<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;\u5bf9\u4e8e\u5e76\u884c\u6d41&#xff0c;\u4f7f\u7528\u5e26combiner\u7684reduce\u66f4\u9ad8\u6548&#xff0c;\u56e0\u4e3acombiner\u53ef\u4ee5\u5408\u5e76\u591a\u4e2a\u7ebf\u7a0b\u7684\u4e2d\u95f4\u7ed3\u679c\u3002<\/p>\n<h3>\u56db\u3001Stream\u7684\u9ad8\u7ea7\u7528\u6cd5<\/h3>\n<p>\u638c\u63e1\u4e86Stream\u7684\u57fa\u672c\u64cd\u4f5c\u540e&#xff0c;\u6211\u4eec\u53ef\u4ee5\u5b66\u4e60\u4e00\u4e9b\u66f4\u9ad8\u7ea7\u7684\u7528\u6cd5&#xff0c;\u5982\u5e76\u884c\u6d41\u5904\u7406\u3001Collectors\u7684\u9ad8\u7ea7\u5e94\u7528\u3001Optional\u4e0eStream\u7684\u7ed3\u5408\u7b49\u3002<\/p>\n<h4>1. \u5e76\u884c\u6d41&#xff08;Parallel Stream&#xff09;<\/h4>\n<p>\u5e76\u884c\u6d41\u662fStream API\u6700\u5f3a\u5927\u7684\u7279\u6027\u4e4b\u4e00&#xff0c;\u5b83\u80fd\u591f\u81ea\u52a8\u5c06\u6570\u636e\u5206\u6210\u591a\u4e2a\u7247\u6bb5&#xff0c;\u5728\u591a\u4e2a\u7ebf\u7a0b\u4e0a\u5e76\u884c\u5904\u7406&#xff0c;\u6700\u540e\u5408\u5e76\u7ed3\u679c\u3002\u4f7f\u7528\u5e76\u884c\u6d41\u65e0\u9700\u7f16\u5199\u4efb\u4f55\u591a\u7ebf\u7a0b\u4ee3\u7801&#xff0c;\u53ea\u9700\u8c03\u7528parallel()\u65b9\u6cd5&#xff08;\u6216\u76f4\u63a5\u4f7f\u7528parallelStream()&#xff09;\u3002<\/p>\n<p>\u793a\u4f8b19&#xff1a;\u5e76\u884c\u6d41\u57fa\u7840<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">LongStream<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ParallelStreamExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruits <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;kiwi&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;mango&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;pineapple&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u987a\u5e8f\u6d41\u5904\u7406<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> sequentialStart <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">toUpperCase<\/span><span class=\"token punctuation\">)<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                  <span class=\"token comment\">\/\/ \u6a21\u62df\u8017\u65f6\u64cd\u4f5c<\/span><br \/>\n                  <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterruptedException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n              <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> sequentialTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> sequentialStart<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u987a\u5e8f\u6d41\u5904\u7406\u65f6\u95f4&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sequentialTime <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5e76\u884c\u6d41\u5904\u7406<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> parallelStart <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8e fruits.stream().parallel()<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">toUpperCase<\/span><span class=\"token punctuation\">)<\/span><br \/>\n              <span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                  <span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">InterruptedException<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> e<span class=\"token punctuation\">.<\/span><span class=\"token function\">printStackTrace<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n              <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> parallelTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> parallelStart<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e76\u884c\u6d41\u5904\u7406\u65f6\u95f4&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> parallelTime <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6d4b\u8bd5\u5e76\u884c\u6d41\u7684\u6027\u80fd\u4f18\u52bf&#xff08;\u8ba1\u7b97\u5927\u91cf\u6570\u636e&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">parallelSum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span> n<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">LongStream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">rangeClosed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> n<span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">parallel<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff08;\u793a\u4f8b&#xff09;&#xff1a;<\/p>\n<p>\u987a\u5e8f\u6d41\u5904\u7406\u65f6\u95f4&#xff1a;723ms<br \/>\n\u5e76\u884c\u6d41\u5904\u7406\u65f6\u95f4&#xff1a;215ms<\/p>\n<p>\u53ef\u4ee5\u770b\u5230&#xff0c;\u5bf9\u4e8e\u8017\u65f6\u64cd\u4f5c\u6216\u5927\u91cf\u6570\u636e&#xff0c;\u5e76\u884c\u6d41\u80fd\u663e\u8457\u63d0\u9ad8\u5904\u7406\u901f\u5ea6\u3002<\/p>\n<h5>\u5e76\u884c\u6d41\u7684\u6ce8\u610f\u4e8b\u9879<\/h5>\n<li>\n<p>\u7ebf\u7a0b\u5b89\u5168&#xff1a;\u5e76\u884c\u6d41\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u6267\u884c&#xff0c;\u82e5\u64cd\u4f5c\u5171\u4eab\u53d8\u91cf&#xff0c;\u9700\u786e\u4fdd\u7ebf\u7a0b\u5b89\u5168&#xff08;\u6216\u4f7f\u7528\u65e0\u72b6\u6001\u64cd\u4f5c&#xff09;\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef\u793a\u4f8b&#xff1a;\u5171\u4eab\u53d8\u91cf\u5728\u5e76\u884c\u6d41\u4e0b\u4e0d\u5b89\u5168<\/span><br \/>\n<span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> sum <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4f7f\u7528\u6570\u7ec4\u5305\u88c5\u4ee5\u5141\u8bb8\u5728lambda\u4e2d\u4fee\u6539<\/span><br \/>\nnumbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">-&gt;<\/span> sum<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53ef\u80fd\u5bfc\u81f4\u7ed3\u679c\u4e0d\u6b63\u786e<\/span><br \/>\n<span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e0d\u5b89\u5168\u7684\u6c42\u548c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sum<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ed3\u679c\u53ef\u80fd\u4e0d\u662f15<\/span><\/p>\n<p>\u6b63\u786e\u7684\u505a\u6cd5\u662f\u4f7f\u7528reduce\u6216collect\u7b49\u65e0\u72b6\u6001\u64cd\u4f5c&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u6b63\u786e&#xff1a;\u4f7f\u7528reduce\u6c42\u548c<\/span><br \/>\n<span class=\"token keyword\">int<\/span> safeSum <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">reduce<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Integer<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<\/li>\n<li>\n<p>\u6027\u80fd\u6743\u8861&#xff1a;<\/p>\n<ul>\n<li>\u5e76\u884c\u6d41\u7684\u4f18\u52bf\u5728\u5927\u6570\u636e\u91cf\u6216\u590d\u6742\u64cd\u4f5c\u65f6\u624d\u660e\u663e&#xff0c;\u5c0f\u6570\u636e\u91cf\u53ef\u80fd\u56e0\u7ebf\u7a0b\u5f00\u9500\u800c\u66f4\u6162\u3002<\/li>\n<li>\u907f\u514d\u5728\u5e76\u884c\u6d41\u4e2d\u4f7f\u7528forEachOrdered&#xff0c;\u5b83\u4f1a\u5f3a\u5236\u987a\u5e8f\u6267\u884c&#xff0c;\u62b5\u6d88\u5e76\u884c\u4f18\u52bf\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u6d41\u7684\u6765\u6e90&#xff1a;<\/p>\n<ul>\n<li>ArrayList\u3001\u6570\u7ec4\u7b49\u968f\u673a\u8bbf\u95ee\u6570\u636e\u6e90\u66f4\u9002\u5408\u5e76\u884c\u6d41&#xff08;\u5206\u5272\u6210\u672c\u4f4e&#xff09;\u3002<\/li>\n<li>LinkedList\u7b49\u975e\u968f\u673a\u8bbf\u95ee\u6570\u636e\u6e90\u4e0d\u9002\u5408\u5e76\u884c\u6d41&#xff08;\u5206\u5272\u6210\u672c\u9ad8&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u81ea\u5b9a\u4e49\u5e76\u884c\u5ea6&#xff1a;<br \/>\n\u5e76\u884c\u6d41\u7684\u9ed8\u8ba4\u7ebf\u7a0b\u6570\u7b49\u4e8eCPU\u6838\u5fc3\u6570&#xff0c;\u53ef\u901a\u8fc7ForkJoinPool\u4fee\u6539&#xff1a;<\/p>\n<p><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setProperty<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;java.util.concurrent.ForkJoinPool.common.parallelism&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;4&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8bbe\u7f6e\u5e76\u884c\u5ea6\u4e3a4<\/span><\/p>\n<\/li>\n<h4>2. Collectors\u7684\u9ad8\u7ea7\u5e94\u7528<\/h4>\n<p>Collectors\u5de5\u5177\u7c7b\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6536\u96c6\u5668&#xff0c;\u9664\u4e86\u57fa\u672c\u7684toList()\u3001toSet()&#xff0c;\u8fd8\u6709\u5206\u7ec4\u3001\u5206\u533a\u3001\u805a\u5408\u7b49\u9ad8\u7ea7\u529f\u80fd\u3002<\/p>\n<h5>\u5206\u7ec4&#xff08;groupingBy&#xff09;<\/h5>\n<p>groupingBy(Function&lt;T, K&gt; classifier)&#xff1a;\u6839\u636eclassifier\u5c06\u5143\u7d20\u5206\u7ec4&#xff0c;\u8fd4\u56deMap&lt;K, List&lt;T&gt;&gt;\u3002<\/p>\n<p>\u793a\u4f8b20&#xff1a;\u5206\u7ec4\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5546\u54c1\u7c7b<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Product<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> category<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> price<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> category<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> price<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>category <span class=\"token operator\">&#061;<\/span> category<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>price <span class=\"token operator\">&#061;<\/span> price<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getCategory<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> category<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> price<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; (&#034;<\/span> <span class=\"token operator\">&#043;<\/span> price <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;)&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">GroupingByExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> products <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b14\u8bb0\u672c\u7535\u8111&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7535\u5b50\u4ea7\u54c1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5999.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u667a\u80fd\u624b\u673a&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7535\u5b50\u4ea7\u54c1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3999.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;T\u6064&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u670d\u88c5&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">99.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u725b\u4ed4\u88e4&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u670d\u88c5&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">199.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7bee\u7403&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u8fd0\u52a8\u5668\u6750&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">149.99<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 1. \u6309\u7c7b\u522b\u5206\u7ec4<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">List<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> byCategory <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getCategory<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6253\u5370\u5206\u7ec4\u7ed3\u679c<\/span><br \/>\n        byCategory<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>category<span class=\"token punctuation\">,<\/span> prods<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7c7b\u522b&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> category<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            prods<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>prod <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  &#034;<\/span> <span class=\"token operator\">&#043;<\/span> prod<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. \u6309\u4ef7\u683c\u533a\u95f4\u5206\u7ec4&#xff08;\u81ea\u5b9a\u4e49\u5206\u7c7b\u5668&#xff09;<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">List<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> byPriceRange <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span>product <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                                                            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>product<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u4f4e\u4ef7&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                                                            <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>product<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u4e2d\u4ef7&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                                                            <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u9ad8\u4ef7&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                                                        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n\u6309\u4ef7\u683c\u533a\u95f4\u5206\u7ec4&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        byPriceRange<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>range<span class=\"token punctuation\">,<\/span> prods<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4ef7\u683c\u533a\u95f4&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> range<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            prods<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>prod <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;  &#034;<\/span> <span class=\"token operator\">&#043;<\/span> prod<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff1a;<\/p>\n<p>\u7c7b\u522b&#xff1a;\u7535\u5b50\u4ea7\u54c1<br \/>\n  \u7b14\u8bb0\u672c\u7535\u8111 (5999.99)<br \/>\n  \u667a\u80fd\u624b\u673a (3999.99)<br \/>\n\u7c7b\u522b&#xff1a;\u670d\u88c5<br \/>\n  T\u6064 (99.99)<br \/>\n  \u725b\u4ed4\u88e4 (199.99)<br \/>\n\u7c7b\u522b&#xff1a;\u8fd0\u52a8\u5668\u6750<br \/>\n  \u7bee\u7403 (149.99)<\/p>\n<p>\u6309\u4ef7\u683c\u533a\u95f4\u5206\u7ec4&#xff1a;<br \/>\n\u4ef7\u683c\u533a\u95f4&#xff1a;\u4f4e\u4ef7<br \/>\n  T\u6064 (99.99)<br \/>\n  \u725b\u4ed4\u88e4 (199.99)<br \/>\n  \u7bee\u7403 (149.99)<br \/>\n\u4ef7\u683c\u533a\u95f4&#xff1a;\u9ad8\u4ef7<br \/>\n  \u7b14\u8bb0\u672c\u7535\u8111 (5999.99)<br \/>\n  \u667a\u80fd\u624b\u673a (3999.99)<\/p>\n<h5>\u591a\u7ea7\u5206\u7ec4<\/h5>\n<p>groupingBy\u53ef\u4ee5\u5d4c\u5957\u4f7f\u7528&#xff0c;\u5b9e\u73b0\u591a\u7ea7\u5206\u7ec4&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u5148\u6309\u7c7b\u522b\u5206\u7ec4&#xff0c;\u518d\u6309\u4ef7\u683c\u533a\u95f4\u5206\u7ec4<\/span><br \/>\n<span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">List<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> multiLevelGroup <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n        <span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getCategory<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ \u4e00\u7ea7\u5206\u7ec4&#xff1a;\u7c7b\u522b<\/span><br \/>\n        <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span>product <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span>  <span class=\"token comment\">\/\/ \u4e8c\u7ea7\u5206\u7ec4&#xff1a;\u4ef7\u683c\u533a\u95f4<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>product<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u4f4e\u4ef7&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>product<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u4e2d\u4ef7&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">return<\/span> <span class=\"token string\">&#034;\u9ad8\u4ef7&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h5>\u5206\u533a&#xff08;partitioningBy&#xff09;<\/h5>\n<p>partitioningBy(Predicate&lt;T&gt; predicate)&#xff1a;\u6839\u636ePredicate\u5c06\u5143\u7d20\u5206\u4e3a\u4e24\u7ec4&#xff08;\u6ee1\u8db3\u6761\u4ef6\u548c\u4e0d\u6ee1\u8db3\u6761\u4ef6&#xff09;&#xff0c;\u8fd4\u56deMap&lt;Boolean, List&lt;T&gt;&gt;\u3002<\/p>\n<p>\u793a\u4f8b21&#xff1a;\u5206\u533a\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">PartitioningByExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6309\u662f\u5426\u4e3a\u5076\u6570\u5206\u533a<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Boolean<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">List<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> evenOddPartition <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                            <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">partitioningBy<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">-&gt;<\/span> n <span class=\"token operator\">%<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5076\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> evenOddPartition<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[2, 4, 6, 8, 10]<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5947\u6570&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> evenOddPartition<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[1, 3, 5, 7, 9]<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> products <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b14\u8bb0\u672c\u7535\u8111&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7535\u5b50\u4ea7\u54c1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5999.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;T\u6064&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u670d\u88c5&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">99.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u725b\u4ed4\u88e4&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u670d\u88c5&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">199.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7bee\u7403&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u8fd0\u52a8\u5668\u6750&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">149.99<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6309\u4ef7\u683c\u662f\u5426\u4f4e\u4e8e200\u5206\u533a<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Boolean<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">List<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> pricePartition <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                           <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">partitioningBy<\/span><span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">-&gt;<\/span> p<span class=\"token punctuation\">.<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n\u4ef7\u683c\u4f4e\u4e8e200\u7684\u5546\u54c1&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        pricePartition<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4ef7\u683c\u4e0d\u4f4e\u4e8e200\u7684\u5546\u54c1&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        pricePartition<span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">false<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u805a\u5408\u51fd\u6570&#xff08;summing\/averaging\/counting&#xff09;<\/h5>\n<p>Collectors\u63d0\u4f9b\u4e86\u591a\u79cd\u805a\u5408\u51fd\u6570&#xff0c;\u7528\u4e8e\u5bf9\u5206\u7ec4\u540e\u7684\u5143\u7d20\u8fdb\u884c\u7edf\u8ba1&#xff1a;<\/p>\n<ul>\n<li>summingInt(ToIntFunction&lt;T&gt; mapper)&#xff1a;\u6c42\u548c<\/li>\n<li>averagingInt(ToIntFunction&lt;T&gt; mapper)&#xff1a;\u6c42\u5e73\u5747\u503c<\/li>\n<li>counting()&#xff1a;\u8ba1\u6570<\/li>\n<li>maxBy(Comparator&lt;T&gt; comparator)&#xff1a;\u6c42\u6700\u5927\u503c<\/li>\n<li>minBy(Comparator&lt;T&gt; comparator)&#xff1a;\u6c42\u6700\u5c0f\u503c<\/li>\n<li>summarizingInt(ToIntFunction&lt;T&gt; mapper)&#xff1a;\u751f\u6210\u5305\u542b\u603b\u548c\u3001\u5e73\u5747\u503c\u3001\u6700\u503c\u3001\u6570\u91cf\u7684\u7edf\u8ba1\u6458\u8981<\/li>\n<\/ul>\n<p>\u793a\u4f8b22&#xff1a;\u805a\u5408\u64cd\u4f5c<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">DoubleSummaryStatistics<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Optional<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AggregationExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> products <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b14\u8bb0\u672c\u7535\u8111&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7535\u5b50\u4ea7\u54c1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5999.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u667a\u80fd\u624b\u673a&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7535\u5b50\u4ea7\u54c1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3999.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;T\u6064&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u670d\u88c5&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">99.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u725b\u4ed4\u88e4&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u670d\u88c5&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">199.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7bee\u7403&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u8fd0\u52a8\u5668\u6750&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">149.99<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 1. \u6309\u7c7b\u522b\u5206\u7ec4&#xff0c;\u8ba1\u7b97\u6bcf\u7ec4\u5546\u54c1\u7684\u603b\u4ef7\u683c<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Double<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> totalPriceByCategory <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                          <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                                                              <span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getCategory<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                                              <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">summingDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                          <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5404\u7c7b\u522b\u603b\u4ef7\u683c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> totalPriceByCategory<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. \u6309\u7c7b\u522b\u5206\u7ec4&#xff0c;\u8ba1\u7b97\u6bcf\u7ec4\u5546\u54c1\u7684\u5e73\u5747\u4ef7\u683c<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Double<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> avgPriceByCategory <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                       <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                                                           <span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getCategory<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                                           <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">averagingDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                       <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5404\u7c7b\u522b\u5e73\u5747\u4ef7\u683c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> avgPriceByCategory<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 3. \u6309\u7c7b\u522b\u5206\u7ec4&#xff0c;\u7edf\u8ba1\u6bcf\u7ec4\u5546\u54c1\u6570\u91cf<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Long<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> countByCategory <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                  <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                                                      <span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getCategory<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                                      <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">counting<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                  <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5404\u7c7b\u522b\u5546\u54c1\u6570\u91cf&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> countByCategory<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 4. \u6309\u7c7b\u522b\u5206\u7ec4&#xff0c;\u627e\u51fa\u6bcf\u7ec4\u4e2d\u4ef7\u683c\u6700\u9ad8\u7684\u5546\u54c1<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Optional<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> maxPriceProductByCategory <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                                         <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                                                                             <span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getCategory<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                                                                             <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">maxBy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">comparingDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                                         <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5404\u7c7b\u522b\u6700\u9ad8\u4ef7\u5546\u54c1&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        maxPriceProductByCategory<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>category<span class=\"token punctuation\">,<\/span> product<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span><br \/>\n            product<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>p <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>category <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> p<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 5. \u83b7\u53d6\u6240\u6709\u5546\u54c1\u7684\u4ef7\u683c\u7edf\u8ba1\u6458\u8981<\/span><br \/>\n        <span class=\"token class-name\">DoubleSummaryStatistics<\/span> priceStats <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                   <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">summarizingDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getPrice<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\\\\n\u4ef7\u683c\u7edf\u8ba1\u6458\u8981&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u603b\u6570\u91cf&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> priceStats<span class=\"token punctuation\">.<\/span><span class=\"token function\">getCount<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u603b\u4ef7\u683c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> priceStats<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e73\u5747\u4ef7\u683c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> priceStats<span class=\"token punctuation\">.<\/span><span class=\"token function\">getAverage<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u4f4e\u4ef7\u683c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> priceStats<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMin<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u9ad8\u4ef7\u683c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> priceStats<span class=\"token punctuation\">.<\/span><span class=\"token function\">getMax<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u5b57\u7b26\u4e32\u62fc\u63a5&#xff08;joining&#xff09;<\/h5>\n<p>joining()&#xff1a;\u5c06Stream\u4e2d\u7684\u5b57\u7b26\u4e32\u5143\u7d20\u62fc\u63a5\u8d77\u6765&#xff0c;\u652f\u6301\u6307\u5b9a\u5206\u9694\u7b26\u3001\u524d\u7f00\u548c\u540e\u7f00\u3002<\/p>\n<p>\u793a\u4f8b23&#xff1a;\u5b57\u7b26\u4e32\u62fc\u63a5<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">JoiningExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> fruits <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;apple&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;banana&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;orange&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;grape&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u76f4\u63a5\u62fc\u63a5<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> joined <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">joining<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u76f4\u63a5\u62fc\u63a5&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> joined<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;applebananaorangegrape<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528\u9017\u53f7\u5206\u9694<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> joinedWithComma <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">joining<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;, &#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u9017\u53f7\u5206\u9694&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> joinedWithComma<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;apple, banana, orange, grape<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5e26\u524d\u7f00\u3001\u540e\u7f00\u548c\u5206\u9694\u7b26<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> joinedWithPrefixSuffix <span class=\"token operator\">&#061;<\/span> fruits<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                             <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">joining<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;, &#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Fruits: [&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;]&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e26\u524d\u7f00\u540e\u7f00&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> joinedWithPrefixSuffix<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;Fruits: [apple, banana, orange, grape]<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5bf9\u5bf9\u8c61\u7684\u67d0\u4e2a\u5b57\u6bb5\u8fdb\u884c\u62fc\u63a5<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> products <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7b14\u8bb0\u672c\u7535\u8111&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7535\u5b50\u4ea7\u54c1&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5999.99<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Product<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;T\u6064&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u670d\u88c5&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">99.99<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">String<\/span> productNames <span class=\"token operator\">&#061;<\/span> products<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                     <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Product<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                     <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">joining<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u3001&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5546\u54c1\u5217\u8868&#xff1a;&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>productNames<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u5546\u54c1\u5217\u8868&#xff1a;\u7b14\u8bb0\u672c\u7535\u8111\u3001T\u6064<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. Optional\u4e0eStream\u7684\u7ed3\u5408<\/h4>\n<p>Optional\u662fJava 8\u5f15\u5165\u7684\u7528\u4e8e\u5904\u7406\u7a7a\u503c\u7684\u5bb9\u5668\u7c7b&#xff0c;\u4e0eStream\u7ed3\u5408\u4f7f\u7528\u53ef\u4ee5\u4f18\u96c5\u5730\u5904\u7406\u53ef\u80fd\u4e3a\u7a7a\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u793a\u4f8b24&#xff1a;Optional\u4e0eStream<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Optional<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OptionalStreamExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;world&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;java&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;stream&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;optional&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8fc7\u6ee4\u6389null\u5e76\u67e5\u627e\u957f\u5ea6\u5927\u4e8e5\u7684\u7b2c\u4e00\u4e2a\u5355\u8bcd<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> longWord <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>word <span class=\"token operator\">-&gt;<\/span> word <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8fc7\u6ee4null<\/span><br \/>\n                                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>word <span class=\"token operator\">-&gt;<\/span> word<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                        <span class=\"token punctuation\">.<\/span><span class=\"token function\">findFirst<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        longWord<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresent<\/span><span class=\"token punctuation\">(<\/span>word <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u957f\u5ea6\u5927\u4e8e5\u7684\u5355\u8bcd&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> word<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;stream<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8f6c\u6362\u4e3aOptional\u5e76\u5904\u7406<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> max <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">compare<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        max<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresentOrElse<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            value <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u5927\u503c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u96c6\u5408\u4e3a\u7a7a&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u7a7a\u96c6\u5408\u7684\u5904\u7406<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> emptyList <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Optional<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> emptyMax <span class=\"token operator\">&#061;<\/span> emptyList<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">max<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">compare<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        emptyMax<span class=\"token punctuation\">.<\/span><span class=\"token function\">ifPresentOrElse<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            value <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6700\u5927\u503c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> value<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u96c6\u5408\u4e3a\u7a7a&#034;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa\u6b64\u53e5<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4. \u81ea\u5b9a\u4e49Collector<\/h4>\n<p>\u9664\u4e86Collectors\u63d0\u4f9b\u7684\u9884\u5b9a\u4e49\u6536\u96c6\u5668&#xff0c;\u6211\u4eec\u8fd8\u53ef\u4ee5\u901a\u8fc7Collector.of()\u521b\u5efa\u81ea\u5b9a\u4e49\u6536\u96c6\u5668&#xff0c;\u6ee1\u8db3\u7279\u6b8a\u9700\u6c42\u3002<\/p>\n<p>\u793a\u4f8b25&#xff1a;\u81ea\u5b9a\u4e49Collector<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>function<span class=\"token punctuation\">.<\/span><\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collector<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u81ea\u5b9a\u4e49\u6536\u96c6\u5668&#xff1a;\u5c06\u5b57\u7b26\u4e32\u6536\u96c6\u5230LinkedList&#xff0c;\u5e76\u8f6c\u6362\u4e3a\u5927\u5199<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ToUpperCaseLinkedListCollector<\/span> <span class=\"token keyword\">implements<\/span> <span class=\"token class-name\">Collector<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">LinkedList<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">LinkedList<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u63d0\u4f9b\u521d\u59cb\u5bb9\u5668<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Supplier<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LinkedList<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">supplier<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">LinkedList<\/span><span class=\"token operator\">::<\/span><span class=\"token keyword\">new<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u7d2f\u52a0\u64cd\u4f5c&#xff1a;\u5c06\u5143\u7d20\u8f6c\u6362\u4e3a\u5927\u5199\u5e76\u6dfb\u52a0\u5230\u5bb9\u5668<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">BiConsumer<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LinkedList<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">accumulator<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span>list<span class=\"token punctuation\">,<\/span> str<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>str<span class=\"token punctuation\">.<\/span><span class=\"token function\">toUpperCase<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5408\u5e76\u64cd\u4f5c&#xff08;\u5e76\u884c\u6d41\u4e2d\u4f7f\u7528&#xff09;<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">BinaryOperator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LinkedList<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">combiner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token punctuation\">(<\/span>list1<span class=\"token punctuation\">,<\/span> list2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            list1<span class=\"token punctuation\">.<\/span><span class=\"token function\">addAll<\/span><span class=\"token punctuation\">(<\/span>list2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> list1<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6700\u7ec8\u8f6c\u6362&#xff08;\u6b64\u5904\u65e0\u9700\u8f6c\u6362&#xff0c;\u76f4\u63a5\u8fd4\u56de\u5bb9\u5668&#xff09;<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Function<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">LinkedList<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">LinkedList<\/span><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">finisher<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Function<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">identity<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u6536\u96c6\u5668\u7279\u6027<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Set<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Characteristics<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">characteristics<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">unmodifiableSet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">EnumSet<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">of<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token class-name\">Characteristics<\/span><span class=\"token punctuation\">.<\/span>IDENTITY_FINISH<span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u8868\u793afinisher\u662f\u6052\u7b49\u51fd\u6570<\/span><br \/>\n            <span class=\"token class-name\">Characteristics<\/span><span class=\"token punctuation\">.<\/span>CONCURRENT       <span class=\"token comment\">\/\/ \u8868\u793a\u53ef\u4ee5\u5e76\u884c\u6536\u96c6&#xff08;\u9700\u5bb9\u5668\u652f\u6301\u5e76\u53d1&#xff09;<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">CustomCollectorExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> words <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;hello&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;world&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;java&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;stream&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f7f\u7528\u81ea\u5b9a\u4e49\u6536\u96c6\u5668<\/span><br \/>\n        <span class=\"token class-name\">LinkedList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> upperCaseWords <span class=\"token operator\">&#061;<\/span> words<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                                                <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ToUpperCaseLinkedListCollector<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8f6c\u6362\u4e3a\u5927\u5199\u7684LinkedList&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> upperCaseWords<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;[HELLO, WORLD, JAVA, STREAM]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u81ea\u5b9a\u4e49\u6536\u96c6\u5668\u9002\u7528\u4e8e\u590d\u6742\u7684\u6536\u96c6\u903b\u8f91&#xff0c;\u7b80\u5355\u573a\u666f\u4f7f\u7528\u9884\u5b9a\u4e49\u6536\u96c6\u5668\u5373\u53ef\u3002<\/p>\n<h3>\u4e94\u3001Stream API\u6027\u80fd\u5206\u6790<\/h3>\n<p>Stream API\u4e0d\u4ec5\u4ee3\u7801\u7b80\u6d01&#xff0c;\u5176\u6027\u80fd\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u4e5f\u4f18\u4e8e\u4f20\u7edf\u7684\u8fed\u4ee3\u65b9\u5f0f&#xff0c;\u5c24\u5176\u662f\u5728\u5e76\u884c\u5904\u7406\u65f6\u3002\u4f46\u6027\u80fd\u8868\u73b0\u53d7\u591a\u79cd\u56e0\u7d20\u5f71\u54cd&#xff0c;\u4e86\u89e3\u8fd9\u4e9b\u56e0\u7d20\u6709\u52a9\u4e8e\u5199\u51fa\u66f4\u9ad8\u6548\u7684Stream\u4ee3\u7801\u3002<\/p>\n<h4>1. Stream vs \u4f20\u7edf\u8fed\u4ee3<\/h4>\n<p>\u5728\u5355\u7ebf\u7a0b\u73af\u5883\u4e0b&#xff0c;\u5bf9\u4e8e\u7b80\u5355\u64cd\u4f5c&#xff0c;Stream\u7684\u6027\u80fd\u4e0e\u4f20\u7edffor\u5faa\u73af\u63a5\u8fd1\u6216\u7565\u5dee&#xff08;\u56e0Stream\u6709\u989d\u5916\u7684\u5c01\u88c5\u5f00\u9500&#xff09;&#xff1b;\u4f46\u5bf9\u4e8e\u590d\u6742\u64cd\u4f5c\u6216\u94fe\u5f0f\u64cd\u4f5c&#xff0c;Stream\u7684\u6027\u80fd\u5f80\u5f80\u66f4\u4f18&#xff0c;\u56e0\u4e3a\u5176\u5185\u90e8\u5b9e\u73b0\u7ecf\u8fc7\u4e86\u4f18\u5316\u3002<\/p>\n<p>\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b&#xff0c;\u5e76\u884c\u6d41\u901a\u5e38\u8fdc\u4f18\u4e8e\u624b\u52a8\u5b9e\u73b0\u7684\u591a\u7ebf\u7a0b\u8fed\u4ee3&#xff0c;\u56e0\u4e3aStream API\u7684\u5e76\u884c\u673a\u5236&#xff08;\u57fa\u4e8eFork\/Join\u6846\u67b6&#xff09;\u80fd\u66f4\u9ad8\u6548\u5730\u5229\u7528CPU\u8d44\u6e90\u3002<\/p>\n<p>\u6027\u80fd\u6d4b\u8bd5\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">LongStream<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">StreamPerformanceTest<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> SIZE <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10_000_000<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 1000\u4e07\u6570\u636e<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u51c6\u5907\u6570\u636e<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Long<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> numbers <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span>SIZE<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> SIZE<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u4f20\u7edffor\u5faa\u73af\u6c42\u548c<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> loopStart <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> loopSum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">long<\/span> num <span class=\"token operator\">:<\/span> numbers<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            loopSum <span class=\"token operator\">&#043;&#061;<\/span> num<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> loopTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> loopStart<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4f20\u7edffor\u5faa\u73af&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> loopTime <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#xff0c;\u7ed3\u679c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> loopSum<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u987a\u5e8f\u6d41\u6c42\u548c<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> sequentialStart <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> sequentialSum <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">mapToLong<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">longValue<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> sequentialTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> sequentialStart<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u987a\u5e8f\u6d41&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sequentialTime <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#xff0c;\u7ed3\u679c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> sequentialSum<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5e76\u884c\u6d41\u6c42\u548c<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> parallelStart <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> parallelSum <span class=\"token operator\">&#061;<\/span> numbers<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">mapToLong<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Long<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">longValue<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> parallelTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> parallelStart<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5e76\u884c\u6d41&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> parallelTime <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#xff0c;\u7ed3\u679c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> parallelSum<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u76f4\u63a5\u4f7f\u7528LongStream&#xff08;\u6027\u80fd\u6700\u4f18&#xff09;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> primitiveStart <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> primitiveSum <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">LongStream<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">rangeClosed<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">,<\/span> SIZE <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">long<\/span> primitiveTime <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentTimeMillis<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> primitiveStart<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;LongStream&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> primitiveTime <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;ms&#xff0c;\u7ed3\u679c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> primitiveSum<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff08;\u793a\u4f8b&#xff09;&#xff1a;<\/p>\n<p>\u4f20\u7edffor\u5faa\u73af&#xff1a;46ms&#xff0c;\u7ed3\u679c&#xff1a;49999995000000<br \/>\n\u987a\u5e8f\u6d41&#xff1a;38ms&#xff0c;\u7ed3\u679c&#xff1a;49999995000000<br \/>\n\u5e76\u884c\u6d41&#xff1a;12ms&#xff0c;\u7ed3\u679c&#xff1a;49999995000000<br \/>\nLongStream&#xff1a;3ms&#xff0c;\u7ed3\u679c&#xff1a;49999995000000<\/p>\n<p>\u53ef\u4ee5\u770b\u5230&#xff1a;<\/p>\n<ul>\n<li>\u987a\u5e8f\u6d41\u6027\u80fd\u7565\u4f18\u4e8e\u4f20\u7edffor\u5faa\u73af&#xff08;\u56e0Stream\u5185\u90e8\u4f18\u5316&#xff09;\u3002<\/li>\n<li>\u5e76\u884c\u6d41\u6027\u80fd\u8fdc\u4f18\u4e8e\u5355\u7ebf\u7a0b\u65b9\u5f0f&#xff08;\u5145\u5206\u5229\u7528\u591a\u6838CPU&#xff09;\u3002<\/li>\n<li>\u57fa\u672c\u7c7b\u578bStream&#xff08;\u5982LongStream&#xff09;\u6027\u80fd\u6700\u4f18&#xff0c;\u907f\u514d\u4e86\u88c5\u7bb1\/\u62c6\u7bb1\u5f00\u9500\u3002<\/li>\n<\/ul>\n<h4>2. \u5f71\u54cdStream\u6027\u80fd\u7684\u56e0\u7d20<\/h4>\n<li>\n<p>\u6570\u636e\u6e90\u7c7b\u578b&#xff1a;<\/p>\n<ul>\n<li>\u6570\u7ec4\u3001ArrayList\u7b49\u968f\u673a\u8bbf\u95ee\u6570\u636e\u6e90\u7684Stream\u6027\u80fd\u4f18\u4e8eLinkedList\u7b49\u975e\u968f\u673a\u8bbf\u95ee\u6570\u636e\u6e90\u3002<\/li>\n<li>\u57fa\u672c\u7c7b\u578bStream&#xff08;IntStream\u3001LongStream\u7b49&#xff09;\u6027\u80fd\u4f18\u4e8e\u5bf9\u8c61Stream&#xff08;\u907f\u514d\u88c5\u7bb1\/\u62c6\u7bb1&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u64cd\u4f5c\u7c7b\u578b&#xff1a;<\/p>\n<ul>\n<li>\u4e2d\u95f4\u64cd\u4f5c\u7684\u590d\u6742\u5ea6&#xff1a;\u7b80\u5355\u64cd\u4f5c&#xff08;\u5982filter\u3001map&#xff09;\u7684\u6027\u80fd\u635f\u8017\u5c0f&#xff0c;\u590d\u6742\u64cd\u4f5c&#xff08;\u5982sorted&#xff09;\u7684\u6027\u80fd\u635f\u8017\u5927\u3002<\/li>\n<li>\u77ed\u8def\u64cd\u4f5c&#xff08;\u5982anyMatch\u3001limit&#xff09;\u80fd\u63d0\u524d\u7ec8\u6b62\u6d41&#xff0c;\u6027\u80fd\u66f4\u597d\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5e76\u884c\u6d41\u7684\u4f7f\u7528&#xff1a;<\/p>\n<ul>\n<li>\u6570\u636e\u91cf\u5c0f\u6216\u64cd\u4f5c\u7b80\u5355\u65f6&#xff0c;\u5e76\u884c\u6d41\u7684\u7ebf\u7a0b\u5f00\u9500\u53ef\u80fd\u8d85\u8fc7\u5176\u5e26\u6765\u7684\u6536\u76ca\u3002<\/li>\n<li>\u6570\u636e\u91cf\u5927\u6216\u64cd\u4f5c\u590d\u6742\u65f6&#xff0c;\u5e76\u884c\u6d41\u80fd\u663e\u8457\u63d0\u5347\u6027\u80fd\u3002<\/li>\n<li>\u907f\u514d\u5728\u5e76\u884c\u6d41\u4e2d\u4f7f\u7528\u540c\u6b65\u64cd\u4f5c\u6216\u5171\u4eab\u53ef\u53d8\u72b6\u6001&#xff0c;\u5426\u5219\u4f1a\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u7ec8\u7aef\u64cd\u4f5c&#xff1a;<\/p>\n<ul>\n<li>count()\u3001sum()\u7b49\u7b80\u5355\u7ec8\u7aef\u64cd\u4f5c\u6027\u80fd\u4f18\u4e8ecollect(Collectors.toList())\u7b49\u590d\u6742\u64cd\u4f5c\u3002<\/li>\n<li>forEach\u7684\u6027\u80fd\u7565\u4f4e\u4e8ecollect&#xff08;\u56e0forEach\u6709\u526f\u4f5c\u7528&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<h4>3. \u6027\u80fd\u4f18\u5316\u5efa\u8bae<\/h4>\n<li>\u4f18\u5148\u4f7f\u7528\u57fa\u672c\u7c7b\u578bStream&#xff1a;\u5982IntStream\u3001LongStream&#xff0c;\u907f\u514d\u81ea\u52a8\u88c5\u7bb1\/\u62c6\u7bb1\u3002<\/li>\n<li>\u5408\u7406\u9009\u62e9\u6570\u636e\u6e90&#xff1a;\u5bf9\u4e8e\u5927\u91cf\u6570\u636e&#xff0c;\u4f18\u5148\u4f7f\u7528\u6570\u7ec4\u6216ArrayList\u3002<\/li>\n<li>\u9002\u5ea6\u4f7f\u7528\u5e76\u884c\u6d41&#xff1a;\u4ec5\u5728\u6570\u636e\u91cf\u5927\u6216\u64cd\u4f5c\u590d\u6742\u65f6\u4f7f\u7528&#xff0c;\u5c0f\u6570\u636e\u91cf\u4f7f\u7528\u987a\u5e8f\u6d41\u66f4\u9ad8\u6548\u3002<\/li>\n<li>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u88c5\u7bb1\u64cd\u4f5c&#xff1a;\u5982Stream.of(1, 2, 3)\u5e94\u6539\u4e3aIntStream.of(1, 2, 3)\u3002<\/li>\n<li>\u4f7f\u7528\u77ed\u8def\u64cd\u4f5c&#xff1a;\u5728\u53ef\u80fd\u7684\u60c5\u51b5\u4e0b&#xff0c;\u4f7f\u7528limit()\u3001anyMatch()\u7b49\u77ed\u8def\u64cd\u4f5c\u51cf\u5c11\u5904\u7406\u5143\u7d20\u6570\u91cf\u3002<\/li>\n<li>\u907f\u514d\u5728Stream\u4e2d\u4fee\u6539\u5171\u4eab\u53d8\u91cf&#xff1a;\u5171\u4eab\u53d8\u91cf\u4f1a\u5bfc\u81f4\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898&#xff0c;\u4e14\u5f71\u54cd\u5e76\u884c\u6027\u80fd\u3002<\/li>\n<li>\u590d\u6742\u64cd\u4f5c\u8003\u8651\u62c6\u5206&#xff1a;\u5c06\u590d\u6742\u7684\u4e2d\u95f4\u64cd\u4f5c\u62c6\u5206\u4e3a\u591a\u4e2a\u7b80\u5355\u64cd\u4f5c&#xff0c;Stream\u80fd\u66f4\u597d\u5730\u4f18\u5316\u6267\u884c\u8ba1\u5212\u3002<\/li>\n<h3>\u516d\u3001Stream API\u5b9e\u6218\u6848\u4f8b<\/h3>\n<p>\u4e0b\u9762\u901a\u8fc7\u51e0\u4e2a\u5b9e\u9645\u573a\u666f\u5c55\u793aStream API\u7684\u5f3a\u5927\u529f\u80fd&#xff0c;\u5bf9\u6bd4\u4f20\u7edf\u65b9\u5f0f\u4e0eStream\u65b9\u5f0f\u7684\u4ee3\u7801\u5dee\u5f02\u3002<\/p>\n<h4>\u6848\u4f8b1&#xff1a;\u6570\u636e\u8fc7\u6ee4\u4e0e\u8f6c\u6362<\/h4>\n<p>\u9700\u6c42&#xff1a;\u4ece\u5458\u5de5\u5217\u8868\u4e2d\u7b5b\u9009\u51fa\u90e8\u95e8\u4e3a&#034;\u7814\u53d1\u90e8&#034;\u4e14\u5de5\u8d44\u5927\u4e8e10000\u7684\u5458\u5de5&#xff0c;\u63d0\u53d6\u4ed6\u4eec\u7684\u59d3\u540d\u548c\u90ae\u7bb1&#xff0c;\u5e76\u6309\u5de5\u8d44\u964d\u5e8f\u6392\u5e8f\u3002<\/p>\n<p>\u4f20\u7edf\u65b9\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">ArrayList<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Comparator<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Employee<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> department<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> salary<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> email<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> department<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> salary<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> email<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>department <span class=\"token operator\">&#061;<\/span> department<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>salary <span class=\"token operator\">&#061;<\/span> salary<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>email <span class=\"token operator\">&#061;<\/span> email<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ getter\u65b9\u6cd5<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> name<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getDepartment<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> department<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> salary<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">getEmail<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token keyword\">return<\/span> email<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">class<\/span> <span class=\"token class-name\">EmployeeInfo<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> email<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">EmployeeInfo<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> email<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>email <span class=\"token operator\">&#061;<\/span> email<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; (&#034;<\/span> <span class=\"token operator\">&#043;<\/span> email <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;)&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f20\u7edf\u65b9\u5f0f\u5b9e\u73b0<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">TraditionalExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> employees <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5f20\u4e09&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">12000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhangsan&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u674e\u56db&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5e02\u573a\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;lisi&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u738b\u4e94&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">15000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;wangwu&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8d75\u516d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhaoliu&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u94b1\u4e03&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u8d22\u52a1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;qianqi&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 1. \u7b5b\u9009\u7814\u53d1\u90e8\u4e14\u5de5\u8d44&gt;10000\u7684\u5458\u5de5<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> filtered <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span> emp <span class=\"token operator\">:<\/span> employees<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>emp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getDepartment<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> emp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                filtered<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>emp<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. \u6309\u5de5\u8d44\u964d\u5e8f\u6392\u5e8f<\/span><br \/>\n        <span class=\"token class-name\">Collections<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sort<\/span><span class=\"token punctuation\">(<\/span>filtered<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Comparator<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n            <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span> o1<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Employee<\/span> o2<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">Double<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span>o2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> o1<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u964d\u5e8f<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 3. \u63d0\u53d6\u59d3\u540d\u548c\u90ae\u7bb1<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">EmployeeInfo<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ArrayList<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span> emp <span class=\"token operator\">:<\/span> filtered<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            result<span class=\"token punctuation\">.<\/span><span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EmployeeInfo<\/span><span class=\"token punctuation\">(<\/span>emp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> emp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getEmail<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6253\u5370\u7ed3\u679c<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">EmployeeInfo<\/span> info <span class=\"token operator\">:<\/span> result<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>info<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>Stream\u65b9\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">StreamExample<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> employees <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5f20\u4e09&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">12000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhangsan&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u674e\u56db&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5e02\u573a\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;lisi&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u738b\u4e94&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">15000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;wangwu&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8d75\u516d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhaoliu&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u94b1\u4e03&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u8d22\u52a1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;qianqi&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">EmployeeInfo<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> result <span class=\"token operator\">&#061;<\/span> employees<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u7b5b\u9009\u7814\u53d1\u90e8\u4e14\u5de5\u8d44&gt;10000<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span>emp <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>emp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getDepartment<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;&amp;<\/span> emp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">10000<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6309\u5de5\u8d44\u964d\u5e8f\u6392\u5e8f<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">sorted<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>e1<span class=\"token punctuation\">,<\/span> e2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Double<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span>e2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> e1<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u63d0\u53d6\u59d3\u540d\u548c\u90ae\u7bb1<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>emp <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">EmployeeInfo<\/span><span class=\"token punctuation\">(<\/span>emp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> emp<span class=\"token punctuation\">.<\/span><span class=\"token function\">getEmail<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u6536\u96c6\u7ed3\u679c<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6253\u5370\u7ed3\u679c<\/span><br \/>\n        result<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff08;\u4e24\u79cd\u65b9\u5f0f\u76f8\u540c&#xff09;&#xff1a;<\/p>\n<p>\u738b\u4e94 (wangwu&#064;example.com)<br \/>\n\u5f20\u4e09 (zhangsan&#064;example.com)<\/p>\n<p>\u53ef\u4ee5\u770b\u5230&#xff0c;Stream\u65b9\u5f0f\u7528\u4e0d\u523010\u884c\u4ee3\u7801\u5b8c\u6210\u4e86\u4f20\u7edf\u65b9\u5f0f30\u591a\u884c\u4ee3\u7801\u7684\u529f\u80fd&#xff0c;\u4e14\u903b\u8f91\u66f4\u6e05\u6670\u3002<\/p>\n<h4>\u6848\u4f8b2&#xff1a;\u590d\u6742\u6570\u636e\u805a\u5408<\/h4>\n<p>\u9700\u6c42&#xff1a;\u7edf\u8ba1\u6bcf\u4e2a\u90e8\u95e8\u7684\u5458\u5de5\u4eba\u6570\u3001\u5e73\u5747\u5de5\u8d44\u3001\u6700\u9ad8\u5de5\u8d44\u548c\u6700\u4f4e\u5de5\u8d44&#xff0c;\u5e76\u6309\u90e8\u95e8\u540d\u79f0\u6392\u5e8f\u3002<\/p>\n<p>Stream\u65b9\u5f0f\u5b9e\u73b0&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">List<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Map<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">TreeMap<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span>stream<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7edf\u8ba1\u7ed3\u679c\u7c7b<\/span><br \/>\n<span class=\"token keyword\">class<\/span> <span class=\"token class-name\">DepartmentStats<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token class-name\">String<\/span> department<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">long<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> avgSalary<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> maxSalary<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">double<\/span> minSalary<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">DepartmentStats<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> department<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">long<\/span> count<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> avgSalary<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> maxSalary<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">double<\/span> minSalary<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>department <span class=\"token operator\">&#061;<\/span> department<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>count <span class=\"token operator\">&#061;<\/span> count<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>avgSalary <span class=\"token operator\">&#061;<\/span> avgSalary<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>maxSalary <span class=\"token operator\">&#061;<\/span> maxSalary<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>minSalary <span class=\"token operator\">&#061;<\/span> minSalary<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">toString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">format<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token string\">&#034;\u90e8\u95e8&#xff1a;%s&#xff0c;\u4eba\u6570&#xff1a;%d&#xff0c;\u5e73\u5747\u5de5\u8d44&#xff1a;%.2f&#xff0c;\u6700\u9ad8\u5de5\u8d44&#xff1a;%.2f&#xff0c;\u6700\u4f4e\u5de5\u8d44&#xff1a;%.2f&#034;<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            department<span class=\"token punctuation\">,<\/span> count<span class=\"token punctuation\">,<\/span> avgSalary<span class=\"token punctuation\">,<\/span> maxSalary<span class=\"token punctuation\">,<\/span> minSalary<br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">AggregationCase<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> employees <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5f20\u4e09&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">12000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhangsan&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u674e\u56db&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5e02\u573a\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">9000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;lisi&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u738b\u4e94&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">15000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;wangwu&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8d75\u516d&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u7814\u53d1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">8000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;zhaoliu&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u94b1\u4e03&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u8d22\u52a1\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">11000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;qianqi&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Employee<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b59\u516b&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;\u5e02\u573a\u90e8&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">13000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;sunba&#064;example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6309\u90e8\u95e8\u5206\u7ec4\u7edf\u8ba1<\/span><br \/>\n        <span class=\"token class-name\">Map<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">DepartmentStats<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> statsMap <span class=\"token operator\">&#061;<\/span> employees<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">groupingBy<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                <span class=\"token class-name\">Employee<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getDepartment<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u4f7f\u7528TreeMap\u4fdd\u8bc1\u90e8\u95e8\u540d\u79f0\u6709\u5e8f<\/span><br \/>\n                <span class=\"token class-name\">TreeMap<\/span><span class=\"token operator\">::<\/span><span class=\"token keyword\">new<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                <span class=\"token comment\">\/\/ \u6536\u96c6\u7edf\u8ba1\u4fe1\u606f<\/span><br \/>\n                <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">teeing<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                    <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">counting<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span>  <span class=\"token comment\">\/\/ \u7edf\u8ba1\u4eba\u6570<\/span><br \/>\n                    <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">averagingDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u5e73\u5747\u5de5\u8d44<\/span><br \/>\n                    <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">maxBy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>e1<span class=\"token punctuation\">,<\/span> e2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Double<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span>e1<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> e2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u6700\u9ad8\u5de5\u8d44<\/span><br \/>\n                    <span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">minBy<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>e1<span class=\"token punctuation\">,<\/span> e2<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token class-name\">Double<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compare<\/span><span class=\"token punctuation\">(<\/span>e1<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> e2<span class=\"token punctuation\">.<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u6700\u4f4e\u5de5\u8d44<\/span><br \/>\n                    <span class=\"token comment\">\/\/ \u7ec4\u5408\u7edf\u8ba1\u7ed3\u679c<\/span><br \/>\n                    <span class=\"token punctuation\">(<\/span>count<span class=\"token punctuation\">,<\/span> avg<span class=\"token punctuation\">,<\/span> maxEmp<span class=\"token punctuation\">,<\/span> minEmp<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">DepartmentStats<\/span><span class=\"token punctuation\">(<\/span><br \/>\n                        <span class=\"token string\">&#034;&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token comment\">\/\/ \u90e8\u95e8\u540d\u79f0\u7a0d\u540e\u8bbe\u7f6e<\/span><br \/>\n                        count<span class=\"token punctuation\">,<\/span><br \/>\n                        avg<span class=\"token punctuation\">,<\/span><br \/>\n                        maxEmp<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">orElse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n                        minEmp<span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Employee<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">getSalary<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">orElse<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><br \/>\n                    <span class=\"token punctuation\">)<\/span><br \/>\n                <span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8865\u5145\u90e8\u95e8\u540d\u79f0&#xff08;\u56e0groupingBy\u7684key\u662f\u90e8\u95e8\u540d\u79f0&#xff09;<\/span><br \/>\n        statsMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span>dept<span class=\"token punctuation\">,<\/span> stats<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> stats<span class=\"token punctuation\">.<\/span>department <span class=\"token operator\">&#061;<\/span> dept<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u6253\u5370\u7ed3\u679c<\/span><br \/>\n        statsMap<span class=\"token punctuation\">.<\/span><span class=\"token function\">values<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6ce8\u610f&#xff1a;Collectors.teeing()\u662fJava 12\u5f15\u5165\u7684\u529f\u80fd&#xff0c;\u7528\u4e8e\u540c\u65f6\u6536\u96c6\u591a\u4e2a\u7edf\u8ba1\u7ed3\u679c\u3002<\/p>\n<p>\u8f93\u51fa\u7ed3\u679c&#xff1a;<\/p>\n<p>\u90e8\u95e8&#xff1a;\u8d22\u52a1\u90e8&#xff0c;\u4eba\u6570&#xff1a;1&#xff0c;\u5e73\u5747\u5de5\u8d44&#xff1a;11000.00&#xff0c;\u6700\u9ad8\u5de5\u8d44&#xff1a;11000.00&#xff0c;\u6700\u4f4e\u5de5\u8d44&#xff1a;11000.00<br \/>\n\u90e8\u95e8&#xff1a;\u7814\u53d1\u90e8&#xff0c;\u4eba\u6570&#xff1a;3&#xff0c;\u5e73\u5747\u5de5\u8d44&#xff1a;11666.67&#xff0c;\u6700\u9ad8\u5de5\u8d44&#xff1a;15000.00&#xff0c;\u6700\u4f4e\u5de5\u8d44&#xff1a;8000.00<br \/>\n\u90e8\u95e8&#xff1a;\u5e02\u573a\u90e8&#xff0c;\u4eba\u6570&#xff1a;2&#xff0c;\u5e73\u5747\u5de5\u8d44&#xff1a;11000.00&#xff0c;\u6700\u9ad8\u5de5\u8d44&#xff1a;13000.00&#xff0c;\u6700\u4f4e\u5de5\u8d44&#xff1a;9000.00<\/p>\n<p>\u8fd9\u4e2a\u6848\u4f8b\u5c55\u793a\u4e86Stream API\u5904\u7406\u590d\u6742\u805a\u5408\u9700\u6c42\u7684\u80fd\u529b&#xff0c;\u901a\u8fc7groupingBy\u548cteeing\u7684\u7ec4\u5408&#xff0c;\u7b80\u6d01\u5730\u5b9e\u73b0\u4e86\u591a\u7ef4\u5ea6\u7edf\u8ba1\u3002<\/p>\n<h3>\u4e03\u3001Stream API\u6700\u4f73\u5b9e\u8df5\u4e0e\u5e38\u89c1\u9677\u9631<\/h3>\n<h4>1. \u6700\u4f73\u5b9e\u8df5<\/h4>\n<ul>\n<li>\u4f18\u5148\u4f7f\u7528Stream API&#xff1a;\u5bf9\u4e8e\u96c6\u5408\u5904\u7406&#xff0c;\u4f18\u5148\u8003\u8651\u4f7f\u7528Stream API&#xff0c;\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u53ef\u8bfb\u3002<\/li>\n<li>\u4fdd\u6301Stream\u64cd\u4f5c\u94fe\u7b80\u6d01&#xff1a;\u8fc7\u957f\u7684\u64cd\u4f5c\u94fe\u4f1a\u964d\u4f4e\u53ef\u8bfb\u6027&#xff0c;\u53ef\u9002\u5f53\u62c6\u5206\u6216\u63d0\u53d6\u4e2d\u95f4\u64cd\u4f5c\u3002<\/li>\n<li>\u4f7f\u7528\u65b9\u6cd5\u5f15\u7528\u63d0\u9ad8\u53ef\u8bfb\u6027&#xff1a;\u5982String::toUpperCase\u6bd4s -&gt; s.toUpperCase()\u66f4\u7b80\u6d01\u3002<\/li>\n<li>\u907f\u514d\u5728Stream\u4e2d\u4f7f\u7528\u526f\u4f5c\u7528&#xff1a;forEach\u5e94\u4ec5\u7528\u4e8e\u7ec8\u7aef\u64cd\u4f5c&#xff08;\u5982\u6253\u5370&#xff09;&#xff0c;\u4e0d\u5e94\u4fee\u6539\u5916\u90e8\u53d8\u91cf\u3002<\/li>\n<li>\u6b63\u786e\u5904\u7406\u7a7a\u503c&#xff1a;\u4f7f\u7528filter(Objects::nonNull)\u8fc7\u6ee4\u7a7a\u503c&#xff0c;\u907f\u514dNullPointerException\u3002<\/li>\n<li>\u9009\u62e9\u5408\u9002\u7684\u7ec8\u7aef\u64cd\u4f5c&#xff1a;\u5982\u53ea\u9700\u5224\u65ad\u662f\u5426\u5b58\u5728\u5143\u7d20&#xff0c;\u4f7f\u7528anyMatch\u800c\u975ecollect\u540e\u68c0\u67e5\u5927\u5c0f\u3002<\/li>\n<li>\u5e76\u884c\u6d41\u8c28\u614e\u4f7f\u7528&#xff1a;\u786e\u4fdd\u64cd\u4f5c\u7ebf\u7a0b\u5b89\u5168&#xff0c;\u4e14\u6570\u636e\u91cf\u8db3\u591f\u5927\u4ee5\u62b5\u6d88\u7ebf\u7a0b\u5f00\u9500\u3002<\/li>\n<li>\u5229\u7528\u57fa\u672c\u7c7b\u578bStream&#xff1a;\u51cf\u5c11\u88c5\u7bb1\/\u62c6\u7bb1\u5f00\u9500&#xff0c;\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h4>2. \u5e38\u89c1\u9677\u9631<\/h4>\n<ul>\n<li>\n<p>\u91cd\u590d\u4f7f\u7528Stream&#xff1a;\u4e00\u4e2aStream\u53ea\u80fd\u88ab\u6d88\u8d39\u4e00\u6b21&#xff0c;\u518d\u6b21\u4f7f\u7528\u4f1a\u629b\u51faIllegalStateException\u3002<\/p>\n<p><span class=\"token class-name\">Stream<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> stream <span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\nstream<span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token operator\">::<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u9519\u8bef&#xff1a;Stream\u5df2\u88ab\u5173\u95ed<\/span><\/p>\n<\/li>\n<li>\n<p>\u5ffd\u7565\u5e76\u884c\u6d41\u7684\u7ebf\u7a0b\u5b89\u5168&#xff1a;\u5e76\u884c\u6d41\u4e2d\u64cd\u4f5c\u5171\u4eab\u53d8\u91cf\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u4e0d\u4e00\u81f4\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef\u793a\u4f8b&#xff1a;\u5171\u4eab\u53d8\u91cf\u5728\u5e76\u884c\u6d41\u4e0b\u4e0d\u5b89\u5168<\/span><br \/>\n<span class=\"token class-name\">List<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> list <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">asList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> sum <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\nlist<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">-&gt;<\/span> sum<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;&#061;<\/span> n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ed3\u679c\u53ef\u80fd\u4e0d\u6b63\u786e<\/span><\/p>\n<\/li>\n<li>\n<p>\u8fc7\u5ea6\u4f7f\u7528collect(Collectors.toList())&#xff1a;\u5f88\u591a\u65f6\u5019\u65e0\u9700\u6536\u96c6\u4e3aList&#xff0c;\u53ef\u76f4\u63a5\u4f7f\u7528Stream\u7684\u7ec8\u7aef\u64cd\u4f5c\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u4f4e\u6548&#xff1a;\u5148\u6536\u96c6\u4e3aList\u518d\u5224\u65ad\u5927\u5c0f<\/span><br \/>\n<span class=\"token keyword\">boolean<\/span> hasElements <span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">collect<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Collectors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">size<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9ad8\u6548&#xff1a;\u76f4\u63a5\u4f7f\u7528anyMatch<\/span><br \/>\n<span class=\"token keyword\">boolean<\/span> hasElements <span class=\"token operator\">&#061;<\/span> list<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">anyMatch<\/span><span class=\"token punctuation\">(<\/span>e <span class=\"token operator\">-&gt;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<\/li>\n<li>\n<p>\u8bef\u89e3map\u4e0eflatMap\u7684\u533a\u522b&#xff1a;map\u5c06\u4e00\u4e2a\u5143\u7d20\u8f6c\u6362\u4e3a\u4e00\u4e2a\u5143\u7d20&#xff0c;flatMap\u5c06\u4e00\u4e2a\u5143\u7d20\u8f6c\u6362\u4e3a\u591a\u4e2a\u5143\u7d20\u3002<\/p>\n<\/li>\n<li>\n<p>\u5728filter\u540e\u4f7f\u7528map\u800c\u975emapToXxx&#xff1a;\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u8f6c\u6362&#xff0c;mapToInt\u7b49\u65b9\u6cd5\u6027\u80fd\u66f4\u4f18\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u4f4e\u6548&#xff1a;\u4f1a\u4ea7\u751f\u88c5\u7bb1\u5f00\u9500<\/span><br \/>\nlist<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">map<\/span><span class=\"token punctuation\">(<\/span>s <span class=\"token operator\">-&gt;<\/span> s<span class=\"token punctuation\">.<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9ad8\u6548&#xff1a;\u4f7f\u7528mapToInt<\/span><br \/>\nlist<span class=\"token punctuation\">.<\/span><span class=\"token function\">stream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">filter<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">mapToInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token operator\">::<\/span><span class=\"token function\">length<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<\/li>\n<li>\n<p>\u5ffd\u7565Optional\u7684\u5904\u7406&#xff1a;findFirst()\u3001max()\u7b49\u8fd4\u56deOptional\u7684\u65b9\u6cd5&#xff0c;\u9700\u6b63\u786e\u5904\u7406\u7a7a\u503c\u60c5\u51b5\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u516b\u3001\u603b\u7ed3<\/h3>\n<p>Java Stream API\u662fJava 8\u5f15\u5165\u7684\u9769\u547d\u6027\u7279\u6027&#xff0c;\u5b83\u5f7b\u5e95\u6539\u53d8\u4e86\u96c6\u5408\u6570\u636e\u7684\u5904\u7406\u65b9\u5f0f\u3002\u901a\u8fc7\u58f0\u660e\u5f0f\u7684\u51fd\u6570\u5f0f\u7f16\u7a0b\u98ce\u683c&#xff0c;Stream API\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u66f4\u53ef\u8bfb\u3001\u66f4\u6613\u7ef4\u62a4&#xff0c;\u540c\u65f6\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5e76\u884c\u5904\u7406\u80fd\u529b&#xff0c;\u5145\u5206\u5229\u7528\u591a\u6838CPU\u7684\u4f18\u52bf\u3002<\/p>\n<p>\u672c\u6587\u4eceStream\u7684\u57fa\u672c\u6982\u5ff5\u51fa\u53d1&#xff0c;\u8be6\u7ec6\u4ecb\u7ecd\u4e86Stream\u7684\u521b\u5efa\u65b9\u5f0f\u3001\u4e2d\u95f4\u64cd\u4f5c\u3001\u7ec8\u7aef\u64cd\u4f5c&#xff0c;\u6df1\u5165\u63a2\u8ba8\u4e86\u5e76\u884c\u6d41\u3001Collectors\u9ad8\u7ea7\u5e94\u7528\u3001\u81ea\u5b9a\u4e49Collector\u7b49\u9ad8\u7ea7\u7279\u6027&#xff0c;\u5e76\u901a\u8fc7\u5927\u91cf\u4ee3\u7801\u793a\u4f8b\u5c55\u793a\u4e86Stream 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