{"id":40489,"date":"2025-05-29T09:37:45","date_gmt":"2025-05-29T01:37:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/40489.html"},"modified":"2025-05-29T09:37:45","modified_gmt":"2025-05-29T01:37:45","slug":"java-%e5%90%84%e7%89%88%e6%9c%ac%e6%a0%b8%e5%bf%83%e6%96%b0%e7%89%b9%e6%80%a7%e7%9a%84%e8%af%a6%e7%bb%86%e8%af%b4%e6%98%8e","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/40489.html","title":{"rendered":"Java \u5404\u7248\u672c\u6838\u5fc3\u65b0\u7279\u6027\u7684\u8be6\u7ec6\u8bf4\u660e"},"content":{"rendered":"<h4>\u4e00\u3001Java 8&#xff08;2014&#xff09;\u2014\u2014 \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u91cc\u7a0b\u7891<\/h4>\n<h5>1. Lambda \u8868\u8fbe\u5f0f<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u7b80\u5316\u533f\u540d\u5185\u90e8\u7c7b&#xff0c;\u652f\u6301\u51fd\u6570\u5f0f\u7f16\u7a0b\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token comment\">\/\/ \u4f20\u7edf\u533f\u540d\u5185\u90e8\u7c7b<\/span><br \/>\n<span class=\"token class-name\">Runnable<\/span> r1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Runnable<\/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\">void<\/span> <span class=\"token function\">run<\/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;Hello&#034;<\/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><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ Lambda \u8868\u8fbe\u5f0f<\/span><br \/>\n<span class=\"token class-name\">Runnable<\/span> r2 <span class=\"token operator\">&#061;<\/span> <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;Hello&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<\/ul>\n<h5>2. Stream API<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u58f0\u660e\u5f0f\u5904\u7406\u96c6\u5408\u6570\u636e&#xff0c;\u652f\u6301\u94fe\u5f0f\u64cd\u4f5c\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<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 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> 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> <span class=\"token comment\">\/\/ [1, 4, 9]<\/span>\n <\/li>\n<\/ul>\n<h5>3. \u65b9\u6cd5\u5f15\u7528&#xff08;Method References&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u7b80\u5316 Lambda \u8868\u8fbe\u5f0f&#xff0c;\u76f4\u63a5\u5f15\u7528\u5df2\u6709\u65b9\u6cd5\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;list<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\">\/\/ \u7b49\u4ef7\u4e8e x -&gt; System.out.println(x)<\/span>\n <\/li>\n<\/ul>\n<h5>4. \u9ed8\u8ba4\u65b9\u6cd5\u4e0e\u9759\u6001\u65b9\u6cd5&#xff08;\u63a5\u53e3\u589e\u5f3a&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u5141\u8bb8\u63a5\u53e3\u5305\u542b\u9ed8\u8ba4\u5b9e\u73b0\u548c\u9759\u6001\u65b9\u6cd5\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">MyInterface<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">log<\/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;Default method&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">staticMethod<\/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;Static method&#034;<\/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>\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u4e8c\u3001Java 9&#xff08;2017&#xff09;\u2014\u2014 \u6a21\u5757\u5316\u4e0e\u5de5\u5177\u94fe\u5347\u7ea7<\/h4>\n<h5>1. \u6a21\u5757\u7cfb\u7edf&#xff08;Project Jigsaw&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u901a\u8fc7\u6a21\u5757&#xff08;module-info.java&#xff09;\u7ba1\u7406\u4ee3\u7801\u4f9d\u8d56\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">module<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>example<span class=\"token punctuation\">.<\/span>myapp<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">requires<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>base<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">exports<\/span> <span class=\"token namespace\">com<span class=\"token punctuation\">.<\/span>example<span class=\"token punctuation\">.<\/span>myapp<span class=\"token punctuation\">.<\/span>api<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>\n <\/li>\n<\/ul>\n<h5>2. \u96c6\u5408\u5de5\u5382\u65b9\u6cd5<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u5feb\u901f\u521b\u5efa\u4e0d\u53ef\u53d8\u96c6\u5408\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<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> list <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">List<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">of<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;A&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;B&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;C&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/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\">Integer<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> set <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Set<\/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 punctuation\">;<\/span>\n <\/li>\n<\/ul>\n<h5>3. \u63a5\u53e3\u79c1\u6709\u65b9\u6cd5<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u5141\u8bb8\u5728\u63a5\u53e3\u4e2d\u5b9a\u4e49\u79c1\u6709\u65b9\u6cd5&#xff0c;\u5c01\u88c5\u5185\u90e8\u903b\u8f91\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">interface<\/span> <span class=\"token class-name\">Calculator<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">default<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">calculate<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token function\">add<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span>\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u4e09\u3001Java 10&#xff08;2018&#xff09;\u2014\u2014 \u5c40\u90e8\u53d8\u91cf\u7c7b\u578b\u63a8\u65ad<\/h4>\n<h5>1. var \u5173\u952e\u5b57<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u5c40\u90e8\u53d8\u91cf\u7c7b\u578b\u63a8\u65ad&#xff08;\u7f16\u8bd1\u65f6\u7c7b\u578b\u63a8\u5bfc&#xff09;\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">var<\/span> list <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 class-name\">String<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u63a8\u65ad\u4e3a ArrayList&lt;String&gt;<\/span><br \/>\n<span class=\"token keyword\">var<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Java&#034;<\/span><span class=\"token punctuation\">;<\/span>                  <span class=\"token comment\">\/\/ \u63a8\u65ad\u4e3a String<\/span>\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u56db\u3001Java 11&#xff08;2018&#xff09;\u2014\u2014 LTS \u957f\u671f\u652f\u6301\u7248\u672c<\/h4>\n<h5>1. HTTP Client&#xff08;\u6807\u51c6\u5e93&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u66ff\u4ee3 HttpURLConnection&#xff0c;\u652f\u6301\u5f02\u6b65\u548c HTTP\/2\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token class-name\">HttpClient<\/span> client <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">HttpClient<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newHttpClient<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">HttpRequest<\/span> request <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">HttpRequest<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newBuilder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">uri<\/span><span class=\"token punctuation\">(<\/span><span class=\"token constant\">URI<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;https:\/\/example.com&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">HttpResponse<\/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> response <span class=\"token operator\">&#061;<\/span> client<span class=\"token punctuation\">.<\/span><span class=\"token function\">send<\/span><span class=\"token punctuation\">(<\/span>request<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">BodyHandlers<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">ofString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<\/ul>\n<h5>2. \u5355\u6587\u4ef6\u6e90\u7801\u76f4\u63a5\u8fd0\u884c<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u65e0\u9700\u5148\u7f16\u8bd1 .java \u6587\u4ef6&#xff0c;\u76f4\u63a5\u8fd0\u884c\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token function\">java<\/span> HelloWorld.java\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u4e94\u3001Java 14&#xff08;2020&#xff09;\u2014\u2014 \u8bed\u6cd5\u7cd6\u4e0e\u9884\u89c8\u7279\u6027<\/h4>\n<h5>1. record \u5173\u952e\u5b57&#xff08;\u9884\u89c8&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u5b9a\u4e49\u4e0d\u53ef\u53d8\u6570\u636e\u7c7b&#xff0c;\u81ea\u52a8\u751f\u6210 equals\u3001hashCode\u3001toString\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">record<\/span> <span class=\"token class-name\">Person<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token class-name\">Person<\/span> p <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Person<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Alice&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">30<\/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>p<span class=\"token punctuation\">.<\/span><span class=\"token function\">name<\/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\">\/\/ Alice<\/span>\n <\/li>\n<\/ul>\n<h5>2. switch \u8868\u8fbe\u5f0f&#xff08;\u6b63\u5f0f&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u7b80\u5316 switch \u8bed\u6cd5&#xff0c;\u652f\u6301\u8fd4\u56de\u503c\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token class-name\">String<\/span> dayType <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>day<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#034;Mon&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Tue&#034;<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;Weekday&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token string\">&#034;Sat&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;Sun&#034;<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;Weekend&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token keyword\">throw<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">IllegalArgumentException<\/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>\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u516d\u3001Java 15&#xff08;2020&#xff09;\u2014\u2014 \u5bc6\u5c01\u7c7b\u4e0e\u9690\u85cf\u7c7b<\/h4>\n<h5>1. \u5bc6\u5c01\u7c7b&#xff08;Sealed Classes&#xff0c;\u9884\u89c8&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u9650\u5236\u7c7b\u7684\u7ee7\u627f\u5173\u7cfb\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">sealed<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Shape<\/span> <span class=\"token keyword\">permits<\/span> <span class=\"token class-name\">Circle<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">Square<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Circle<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Shape<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Square<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Shape<\/span> <span class=\"token punctuation\">{<\/span><span class=\"token punctuation\">}<\/span>\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u4e03\u3001Java 16&#xff08;2021&#xff09;\u2014\u2014 \u6a21\u5f0f\u5339\u914d\u4e0e\u5411\u91cfAPI<\/h4>\n<h5>1. \u6a21\u5f0f\u5339\u914d instanceof&#xff08;\u6b63\u5f0f&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u7b80\u5316\u7c7b\u578b\u68c0\u67e5\u548c\u8f6c\u6362\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>obj <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">String<\/span> s<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>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><br \/>\n<span class=\"token punctuation\">}<\/span>\n <\/li>\n<\/ul>\n<h5>2. Stream.toList() \u65b9\u6cd5<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u7b80\u5316\u6d41\u5230\u5217\u8868\u7684\u8f6c\u6362\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<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\">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 punctuation\">.<\/span><span class=\"token function\">toList<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u516b\u3001Java 17&#xff08;2021&#xff09;\u2014\u2014 LTS \u957f\u671f\u652f\u6301\u7248\u672c<\/h4>\n<h5>1. \u5bc6\u5c01\u7c7b&#xff08;\u6b63\u5f0f&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u540c Java 15&#xff0c;\u7ed3\u675f\u9884\u89c8\u72b6\u6001\u3002<\/li>\n<\/ul>\n<h5>2. switch \u6a21\u5f0f\u5339\u914d&#xff08;\u9884\u89c8&#xff09;<\/h5>\n<ul>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token class-name\">Object<\/span> obj <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">String<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>obj<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token class-name\">Integer<\/span> i <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;Integer: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token class-name\">String<\/span> s <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;String: &#034;<\/span> <span class=\"token operator\">&#043;<\/span> s<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;Unknown&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span>\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u4e5d\u3001Java 21&#xff08;2023&#xff09;\u2014\u2014 \u865a\u62df\u7ebf\u7a0b\u4e0e\u7ed3\u6784\u5316\u5e76\u53d1<\/h4>\n<h5>1. \u865a\u62df\u7ebf\u7a0b&#xff08;Virtual Threads&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u8f7b\u91cf\u7ea7\u7ebf\u7a0b&#xff0c;\u63d0\u5347\u9ad8\u5e76\u53d1\u6027\u80fd\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token class-name\">Runnable<\/span> task <span class=\"token operator\">&#061;<\/span> <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 class-name\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">currentThread<\/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\">Thread<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">startVirtualThread<\/span><span class=\"token punctuation\">(<\/span>task<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4f7f\u7528\u865a\u62df\u7ebf\u7a0b<\/span>\n <\/li>\n<\/ul>\n<h5>2. \u5b57\u7b26\u4e32\u6a21\u677f&#xff08;\u9884\u89c8&#xff09;<\/h5>\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u7b80\u5316\u5b57\u7b26\u4e32\u62fc\u63a5\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Java&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token class-name\">String<\/span> message <span class=\"token operator\">&#061;<\/span> <span class=\"token constant\">STR<\/span><span class=\"token punctuation\">.<\/span><span class=\"token string\">&#034;Hello \\\\{name}!&#034;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ Hello Java!<\/span>\n <\/li>\n<\/ul>\n<hr \/>\n<h4>\u603b\u7ed3&#xff1a;\u5404\u7248\u672c\u6838\u5fc3\u7279\u6027\u901f\u67e5\u8868<\/h4>\n<table>\n<tr>\u7248\u672c\u6838\u5fc3\u7279\u6027\u5e94\u7528\u573a\u666f<\/tr>\n<tbody>\n<tr>\n<td>Java 8<\/td>\n<td>Lambda\u3001Stream API\u3001\u65b9\u6cd5\u5f15\u7528<\/td>\n<td>\u96c6\u5408\u5904\u7406\u3001\u51fd\u6570\u5f0f\u7f16\u7a0b<\/td>\n<\/tr>\n<tr>\n<td>Java 9<\/td>\n<td>\u6a21\u5757\u7cfb\u7edf\u3001\u5de5\u5382\u65b9\u6cd5\u96c6\u5408<\/td>\n<td>\u6a21\u5757\u5316\u5f00\u53d1\u3001\u4e0d\u53ef\u53d8\u96c6\u5408<\/td>\n<\/tr>\n<tr>\n<td>Java 10<\/td>\n<td>var \u7c7b\u578b\u63a8\u65ad<\/td>\n<td>\u7b80\u5316\u5c40\u90e8\u53d8\u91cf\u58f0\u660e<\/td>\n<\/tr>\n<tr>\n<td>Java 11<\/td>\n<td>HTTP Client\u3001\u5355\u6587\u4ef6\u8fd0\u884c<\/td>\n<td>\u7f51\u7edc\u8bf7\u6c42\u3001\u5feb\u901f\u6d4b\u8bd5<\/td>\n<\/tr>\n<tr>\n<td>Java 14<\/td>\n<td>record\u3001switch \u8868\u8fbe\u5f0f<\/td>\n<td>\u6570\u636e\u7c7b\u3001\u7b80\u5316\u5206\u652f\u903b\u8f91<\/td>\n<\/tr>\n<tr>\n<td>Java 16<\/td>\n<td>\u6a21\u5f0f\u5339\u914d instanceof\u3001Stream.toList()<\/td>\n<td>\u7c7b\u578b\u68c0\u67e5\u3001\u6d41\u64cd\u4f5c\u4f18\u5316<\/td>\n<\/tr>\n<tr>\n<td>Java 17<\/td>\n<td>\u5bc6\u5c01\u7c7b\u6b63\u5f0f\u7248\u3001switch \u6a21\u5f0f\u5339\u914d<\/td>\n<td>\u7ee7\u627f\u63a7\u5236\u3001\u6a21\u5f0f\u5339\u914d<\/td>\n<\/tr>\n<tr>\n<td>Java 21<\/td>\n<td>\u865a\u62df\u7ebf\u7a0b\u3001\u5b57\u7b26\u4e32\u6a21\u677f<\/td>\n<td>\u9ad8\u5e76\u53d1\u3001\u5b57\u7b26\u4e32\u5904\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h4>\u5347\u7ea7\u5efa\u8bae<\/h4>\n<ul>\n<li>\u751f\u4ea7\u73af\u5883&#xff1a;\u4f18\u5148\u9009\u62e9 LTS \u7248\u672c&#xff08;\u5982 Java 11\u300117\u300121&#xff09;&#xff0c;\u83b7\u5f97\u957f\u671f\u652f\u6301\u3002<\/li>\n<li>\u65b0\u9879\u76ee&#xff1a;\u63a8\u8350\u4f7f\u7528 Java 17 \u6216 21&#xff0c;\u4eab\u53d7\u73b0\u4ee3\u8bed\u6cd5\u548c\u9ad8\u6027\u80fd\u7279\u6027\u3002<\/li>\n<li>\u5b66\u4e60\u65b9\u5411&#xff1a;\u638c\u63e1 Lambda\u3001Stream API\u3001\u6a21\u5f0f\u5339\u914d\u3001\u8bb0\u5f55\u7c7b \u7b49\u6838\u5fc3\u8bed\u6cd5\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb658\u6b21\uff0c\u70b9\u8d5e14\u6b21\uff0c\u6536\u85cf4\u6b21\u3002\u4f18\u5148\u9009\u62e9 LTS \u7248\u672c\uff08\u5982 Java 11\u300117\u300121\uff09\uff0c\u83b7\u5f97\u957f\u671f\u652f\u6301\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,149,190],"topic":[],"class_list":["post-40489","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-windows","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Java \u5404\u7248\u672c\u6838\u5fc3\u65b0\u7279\u6027\u7684\u8be6\u7ec6\u8bf4\u660e - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/40489.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Java \u5404\u7248\u672c\u6838\u5fc3\u65b0\u7279\u6027\u7684\u8be6\u7ec6\u8bf4\u660e - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb658\u6b21\uff0c\u70b9\u8d5e14\u6b21\uff0c\u6536\u85cf4\u6b21\u3002\u4f18\u5148\u9009\u62e9 LTS \u7248\u672c\uff08\u5982 Java 11\u300117\u300121\uff09\uff0c\u83b7\u5f97\u957f\u671f\u652f\u6301\u3002\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/40489.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2025-05-29T01:37:45+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/40489.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/40489.html\",\"name\":\"Java \u5404\u7248\u672c\u6838\u5fc3\u65b0\u7279\u6027\u7684\u8be6\u7ec6\u8bf4\u660e - 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