{"id":91897,"date":"2026-08-08T18:10:16","date_gmt":"2026-08-08T10:10:16","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/91897.html"},"modified":"2026-08-08T18:10:16","modified_gmt":"2026-08-08T10:10:16","slug":"%e3%80%90java%e5%85%a5%e9%97%a8%e5%88%b0%e7%b2%be%e9%80%9a%e3%80%91%e5%9f%ba%e7%a1%80%e7%af%87","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/91897.html","title":{"rendered":"\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7"},"content":{"rendered":"<h3><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808101014-6a77008620f51.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/h3>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 1-10 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u7cfb\u5217\u6559\u7a0b\u4ece\u96f6\u5f00\u59cb&#xff0c;\u5e26\u4f60\u4e86\u89e3 Java \u5386\u53f2\u3001\u6838\u5fc3\u7279\u6027\u3001\u73af\u5883\u914d\u7f6e\u53ca\u7b2c\u4e00\u4e2a\u7a0b\u5e8f\u7f16\u5199\u3002\u4e3b\u8981\u57fa\u4e8e Java 8 LTS \u7248\u672c\u8bb2\u89e3\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 1 \u671f&#xff1a;Java \u8bed\u8a00\u53d1\u5c55\u5386\u53f2\u4e0e\u6838\u5fc3\u7279\u6027\u4ecb\u7ecd<\/h3>\n<p>\u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230 Java \u5165\u95e8\u5230\u7cbe\u901a\u7cfb\u5217\u6559\u7a0b\u7684\u7b2c\u4e00\u671f\u3002\u6211\u662f\u4f60\u4eec\u7684\u8001\u5e08&#xff0c;\u4eca\u5929\u54b1\u4eec\u4ece\u96f6\u5f00\u59cb&#xff0c;\u804a\u804a Java \u8fd9\u95e8\u8bed\u8a00\u5230\u5e95\u662f\u600e\u4e48\u6765\u7684&#xff0c;\u5b83\u6709\u4ec0\u4e48\u725b\u903c\u7684\u5730\u65b9&#xff0c;\u4ee5\u53ca\u5b66\u4e86 Java \u80fd\u5e72\u5565\u3002<\/p>\n<h4>1. Java \u7684\u5386\u53f2<\/h4>\n<ul>\n<li>\u53d1\u5e03\u65f6\u95f4&#xff1a;1995 \u5e74&#xff0c;\u7531 Sun \u516c\u53f8\u53d1\u5e03\u3002<\/li>\n<li>\u521b\u59cb\u4eba&#xff1a;James Gosling&#xff08;\u8a79\u59c6\u65af\u00b7\u9ad8\u65af\u6797&#xff09;&#xff0c;\u88ab\u79f0\u4e3a\u201cJava \u754c\u7684\u7956\u5e08\u7237\u201d\u3002<\/li>\n<li>\u8d77\u6e90\u6545\u4e8b&#xff1a;\u6700\u521d\u662f Sun \u516c\u53f8\u7684\u5185\u90e8\u9879\u76ee\u201cGreen \u8ba1\u5212\u201d&#xff0c;\u65e8\u5728\u5f00\u53d1\u667a\u80fd\u5bb6\u7535\u7684\u7f16\u7a0b\u8bed\u8a00\u3002\u968f\u7740\u4e92\u8054\u7f51\u65f6\u4ee3\u7684\u5230\u6765&#xff0c;Java \u8fc5\u901f\u8d70\u7ea2\u3002<\/li>\n<li>\u547d\u540d\u7531\u6765&#xff1a;\u53d6\u81ea\u5370\u5ea6\u5c3c\u897f\u4e9a\u722a\u54c7\u5c9b&#xff08;Java Island&#xff09;\u7684\u82f1\u6587\u540d&#xff0c;\u90a3\u91cc\u76db\u4ea7\u5496\u5561\u3002\u56e0\u6b64&#xff0c;Java \u7684 Logo \u662f\u4e00\u676f\u5192\u7740\u70ed\u6c14\u7684\u5496\u5561\u3002<\/li>\n<\/ul>\n<h4>2. \u7248\u672c\u8bf4\u660e<\/h4>\n<ul>\n<li>\u5f53\u524d\u7248\u672c&#xff1a;\u5df2\u66f4\u65b0\u81f3 Java 21&#043;\u3002<\/li>\n<li>LTS \u7248\u672c&#xff1a;\u4f01\u4e1a\u4e2d\u6700\u5e38\u7528\u7684\u662f\u957f\u671f\u652f\u6301\u7248\u672c&#xff08;LTS&#xff09;&#xff0c;\u5982 Java 8\u3001Java 11\u3001Java 17 \u7b49\u3002<\/li>\n<li>\u672c\u6559\u7a0b\u57fa\u7840&#xff1a;Java 8\u3002\u56e0\u4e3a\u5b83\u6700\u7ecf\u5178\u3001\u6700\u7a33\u5b9a\u3001\u4f01\u4e1a\u5e94\u7528\u6700\u5e7f\u3002<\/li>\n<\/ul>\n<h4>3. Java \u7684\u6838\u5fc3\u7279\u6027<\/h4>\n<p>Java \u4e4b\u6240\u4ee5\u957f\u76db\u4e0d\u8870&#xff0c;\u4e3b\u8981\u5f52\u529f\u4e8e\u4ee5\u4e0b\u4e94\u5927\u7279\u6027&#xff1a;<\/p>\n<li>\u9762\u5411\u5bf9\u8c61 (OOP)\n<ul>\n<li>\u6838\u5fc3\u601d\u60f3&#xff1a;\u5c06\u73b0\u5b9e\u4e16\u754c\u62bd\u8c61\u4e3a\u4ee3\u7801\u4e2d\u7684\u201c\u5bf9\u8c61\u201d&#xff08;\u5982\u4eba\u3001\u8f66\u3001\u732b&#xff09;\u3002<\/li>\n<li>\u4e09\u5927\u7279\u5f81&#xff1a;\u5c01\u88c5\u3001\u7ee7\u627f\u3001\u591a\u6001&#xff08;\u540e\u7eed\u7ae0\u8282\u8be6\u7ec6\u8bb2\u89e3&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8de8\u5e73\u53f0\u6027 (\u201c\u4e00\u6b21\u7f16\u5199&#xff0c;\u5230\u5904\u8fd0\u884c\u201d)\n<ul>\n<li>\u539f\u7406&#xff1a;\u4f9d\u9760 JVM (Java Virtual Machine)\u3002<\/li>\n<li>\u4f18\u52bf&#xff1a;Windows \u4e0a\u5199\u7684\u4ee3\u7801\u65e0\u9700\u4fee\u6539&#xff0c;\u53ef\u76f4\u63a5\u5728 Linux\/Mac \u4e0a\u8fd0\u884c\u3002C \u8bed\u8a00\u5219\u9700\u9488\u5bf9\u4e0d\u540c\u7cfb\u7edf\u91cd\u65b0\u7f16\u8bd1\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u7b80\u5355\u6613\u5b66\n<ul>\n<li>\u8bed\u6cd5\u7c7b\u4f3c C&#043;&#043;&#xff0c;\u4f46\u53bb\u9664\u4e86\u6307\u9488\u3001\u624b\u52a8\u5185\u5b58\u7ba1\u7406\u3001\u591a\u7ee7\u627f\u7b49\u590d\u6742\u6982\u5ff5\u3002<\/li>\n<li>\u81ea\u52a8\u5783\u573e\u56de\u6536 (GC)&#xff1a;\u65e0\u9700\u624b\u52a8\u91ca\u653e\u5185\u5b58&#xff0c;\u964d\u4f4e\u5165\u95e8\u95e8\u69db\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5b89\u5168\u6027\n<ul>\n<li>\u62e5\u6709\u6c99\u7bb1\u5b89\u5168\u6a21\u578b\u7b49\u673a\u5236&#xff0c;\u9632\u6b62\u6076\u610f\u4ee3\u7801\u7834\u574f\u7cfb\u7edf\u3002\u65e9\u671f\u5e7f\u6cdb\u7528\u4e8e\u6d4f\u89c8\u5668\u7aef\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u591a\u7ebf\u7a0b\u652f\u6301\n<ul>\n<li>\u5185\u7f6e\u591a\u7ebf\u7a0b\u652f\u6301&#xff0c;\u5141\u8bb8\u7a0b\u5e8f\u540c\u65f6\u6267\u884c\u591a\u4e2a\u4efb\u52a1&#xff0c;\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<\/ul>\n<\/li>\n<h4>4. Java \u7684\u5e94\u7528\u9886\u57df<\/h4>\n<ul>\n<li>\u540e\u7aef\u5f00\u53d1&#xff1a;\u7f51\u7ad9\/App \u540e\u53f0\u670d\u52a1&#xff08;\u4e3b\u6d41\u65b9\u5411&#xff09;\u3002<\/li>\n<li>\u5b89\u5353\u5f00\u53d1&#xff1a;\u539f\u751f App \u5f00\u53d1\u8bed\u8a00\u3002<\/li>\n<li>\u5927\u6570\u636e&#xff1a;Hadoop\u3001Spark \u7b49\u6846\u67b6\u5e95\u5c42\u591a\u7528 Java\/Scala\u3002<\/li>\n<li>\u6e38\u620f\u5f00\u53d1&#xff1a;\u4f8b\u5982\u300a\u6211\u7684\u4e16\u754c\u300b(Minecraft)\u3002<\/li>\n<li>\u4f01\u4e1a\u7ea7\u5e94\u7528&#xff1a;\u94f6\u884c\u3001\u91d1\u878d\u3001\u7535\u5546\u7b49\u5927\u578b\u7cfb\u7edf\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 2 \u671f&#xff1a;\u8de8\u5e73\u53f0\u539f\u7406\u4e0e JVM \u865a\u62df\u673a\u8be6\u89e3<\/h3>\n<p>\u4e0a\u671f\u63d0\u5230 Java \u6700\u725b\u7684\u7279\u6027\u662f\u8de8\u5e73\u53f0&#xff0c;\u6838\u5fc3\u5728\u4e8e JVM (Java \u865a\u62df\u673a)\u3002<\/p>\n<h4>1. \u8de8\u5e73\u53f0\u539f\u7406\u7c7b\u6bd4<\/h4>\n<ul>\n<li>\u4f20\u7edf\u65b9\u5f0f (\u5982 C)&#xff1a;\u50cf\u4f5c\u5bb6\u5199\u4e66&#xff0c;\u9700\u8981\u7ffb\u8bd1\u6210\u5404\u79cd\u8bed\u8a00&#xff08;\u4e2d\u6587\u3001\u82f1\u6587\u3001\u65e5\u6587&#xff09;\u624d\u80fd\u7ed9\u4e0d\u540c\u56fd\u5bb6\u7684\u4eba\u770b\u3002\u5bf9\u5e94\u4ee3\u7801&#xff1a;Windows \u7f16\u8bd1\u7684 exe \u53ea\u80fd\u5728 Windows \u8dd1&#xff0c;Linux \u9700\u91cd\u65b0\u7f16\u8bd1\u3002<\/li>\n<li>Java \u65b9\u5f0f&#xff1a;\n<li>\u5148\u7ffb\u8bd1\u6210\u4e00\u79cd\u201c\u4e2d\u95f4\u8bed\u8a00\u201d\u2014\u2014\u5b57\u8282\u7801 (Bytecode)\u3002<\/li>\n<li>\u6bcf\u4e2a\u5e73\u53f0\u90fd\u6709\u4e00\u4e2a\u201c\u7ffb\u8bd1\u5b98\u201d\u2014\u2014JVM&#xff0c;\u5c06\u7edf\u4e00\u7684\u5b57\u8282\u7801\u7ffb\u8bd1\u6210\u8be5\u5e73\u53f0\u80fd\u61c2\u7684\u673a\u5668\u7801\u3002<\/li>\n<\/li>\n<\/ul>\n<h4>2. Java \u6267\u884c\u6d41\u7a0b<\/h4>\n<li>\u6e90\u4ee3\u7801&#xff1a;.java \u6587\u4ef6\u3002<\/li>\n<li>\u7f16\u8bd1&#xff1a;\u4f7f\u7528 javac \u547d\u4ee4&#xff0c;\u751f\u6210 .class \u5b57\u8282\u7801\u6587\u4ef6&#xff08;\u5e73\u53f0\u65e0\u5173&#xff09;\u3002<\/li>\n<li>\u8fd0\u884c&#xff1a;\u4f7f\u7528 java \u547d\u4ee4&#xff0c;JVM \u5c06\u5b57\u8282\u7801\u7ffb\u8bd1\u4e3a\u5f53\u524d\u5e73\u53f0\u7684\u673a\u5668\u7801\u6267\u884c\u3002<\/li>\n<p>\u5173\u952e\u70b9&#xff1a;.class \u5b57\u8282\u7801\u662f\u5e73\u53f0\u65e0\u5173\u7684&#xff1b;JVM \u662f\u5e73\u53f0\u76f8\u5173\u7684&#xff08;Windows\/Mac\/Linux \u5404\u6709\u4e13\u5c5e JVM&#xff09;\u3002<\/p>\n<h4>3. JVM \u7684\u4e3b\u8981\u529f\u80fd<\/h4>\n<p>JVM \u662f\u4e00\u4e2a\u865a\u62df\u8ba1\u7b97\u673a&#xff0c;\u5305\u542b\u6808\u3001\u5806\u3001\u65b9\u6cd5\u533a\u7b49\u5185\u5b58\u7ed3\u6784\u3002\u4e3b\u8981\u804c\u8d23\u5305\u62ec&#xff1a;<\/p>\n<ul>\n<li>\u7c7b\u52a0\u8f7d&#xff1a;\u52a0\u8f7d .class \u6587\u4ef6\u5230\u5185\u5b58\u3002<\/li>\n<li>\u5b57\u8282\u7801\u9a8c\u8bc1&#xff1a;\u68c0\u67e5\u5408\u6cd5\u6027\u4e0e\u5b89\u5168\u6027\u3002<\/li>\n<li>\u89e3\u91ca\u6267\u884c&#xff1a;\u9010\u6761\u7ffb\u8bd1\u5b57\u8282\u7801\u4e3a\u673a\u5668\u7801\u3002<\/li>\n<li>\u5373\u65f6\u7f16\u8bd1 (JIT)&#xff1a;\u5c06\u70ed\u70b9\u4ee3\u7801\u76f4\u63a5\u7f16\u8bd1\u6210\u672c\u5730\u673a\u5668\u7801&#xff0c;\u63d0\u5347\u6548\u7387&#xff08;Java \u5e76\u975e\u7eaf\u89e3\u91ca\u578b\u8bed\u8a00&#xff0c;\u6548\u7387\u63a5\u8fd1 C&#043;&#043;&#xff09;\u3002<\/li>\n<li>\u5783\u573e\u56de\u6536 (GC)&#xff1a;\u81ea\u52a8\u7ba1\u7406\u5185\u5b58\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 3 \u671f&#xff1a;JDK\u3001JRE \u4e0e JVM \u7684\u5173\u7cfb\u56fe\u89e3<\/h3>\n<p>\u521d\u5b66\u8005\u5e38\u6df7\u6dc6 JDK\u3001JRE\u3001JVM&#xff0c;\u4e09\u8005\u5173\u7cfb\u5982\u4e0b&#xff1a;<\/p>\n<h4>1. \u6982\u5ff5\u5b9a\u4e49<\/h4>\n<table>\n<tr>\u7ec4\u4ef6\u5168\u79f0\u5b9a\u4e49\u7528\u9014<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">JVM<\/td>\n<td align=\"left\">Java Virtual Machine<\/td>\n<td align=\"left\">Java \u865a\u62df\u673a<\/td>\n<td align=\"left\">\u8fd0\u884c\u5b57\u8282\u7801\u7684\u6838\u5fc3\u5f15\u64ce\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">JRE<\/td>\n<td align=\"left\">Java Runtime Environment<\/td>\n<td align=\"left\">Java \u8fd0\u884c\u73af\u5883<\/td>\n<td align=\"left\">JVM &#043; \u6838\u5fc3\u7c7b\u5e93\u3002\u7528\u4e8e\u8fd0\u884c Java \u7a0b\u5e8f&#xff0c;\u4e0d\u80fd\u5f00\u53d1\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">JDK<\/td>\n<td align=\"left\">Java Development Kit<\/td>\n<td align=\"left\">Java \u5f00\u53d1\u5de5\u5177\u5305<\/td>\n<td align=\"left\">JRE &#043; \u5f00\u53d1\u5de5\u5177 (javac, java, javadoc \u7b49)\u3002\u7528\u4e8e\u5f00\u53d1 Java \u7a0b\u5e8f\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2. \u5305\u542b\u5173\u7cfb\u56fe<\/h4>\n<p>\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502             JDK             \u2502<br \/>\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u2502<br \/>\n\u2502  \u2502          JRE          \u2502  \u2502<br \/>\n\u2502  \u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510  \u2502  \u2502<br \/>\n\u2502  \u2502  \u2502       JVM       \u2502  \u2502  \u2502<br \/>\n\u2502  \u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502  \u2502<br \/>\n\u2502  \u2502    &#043; \u6838\u5fc3\u7c7b\u5e93          \u2502  \u2502<br \/>\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518  \u2502<br \/>\n\u2502    &#043; \u5f00\u53d1\u5de5\u5177&#xff08;javac\u7b49&#xff09;    \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n<ul>\n<li>\u5173\u7cfb&#xff1a;JDK \u2283 JRE \u2283 JVM<\/li>\n<\/ul>\n<h4>3. \u751f\u6d3b\u5316\u6bd4\u55bb<\/h4>\n<ul>\n<li>JVM &#061; \u6c7d\u8f66\u53d1\u52a8\u673a&#xff08;\u6838\u5fc3\u52a8\u529b&#xff0c;\u4f46\u65e0\u6cd5\u5355\u72ec\u9a7e\u9a76&#xff09;\u3002<\/li>\n<li>JRE &#061; \u5b8c\u6574\u7684\u6c7d\u8f66&#xff08;\u6709\u53d1\u52a8\u673a&#043;\u5ea7\u6905\u8f6e\u80ce&#xff0c;\u53ef\u9a7e\u9a76\/\u8fd0\u884c&#xff0c;\u4f46\u4e0d\u80fd\u9020\u8f66\/\u5f00\u53d1&#xff09;\u3002<\/li>\n<li>JDK &#061; \u8f66\u5e93&#043;\u8f66\u95f4&#xff08;\u6709\u4e00\u8f86\u5b8c\u6574\u6c7d\u8f66&#043;\u5de5\u5177&#xff0c;\u53ef\u9020\u8f66\/\u5f00\u53d1&#xff09;\u3002<\/li>\n<\/ul>\n<h4>4. \u5b89\u88c5\u5efa\u8bae<\/h4>\n<ul>\n<li>\u4ec5\u8fd0\u884c\u7a0b\u5e8f&#xff1a;\u88c5 JRE\u3002<\/li>\n<li>\u5f00\u53d1 Java \u7a0b\u5e8f&#xff1a;\u5fc5\u987b\u88c5 JDK&#xff08;\u5185\u542b JRE&#xff0c;\u65e0\u9700\u5355\u72ec\u88c5 JRE&#xff09;\u3002<\/li>\n<li>JVM&#xff1a;\u65e0\u9700\u5355\u72ec\u5b89\u88c5&#xff0c;\u5305\u542b\u5728 JRE\/JDK \u4e2d\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 4 \u671f&#xff1a;\u4e0b\u8f7d\u4e0e\u5b89\u88c5 JDK \u73af\u5883&#xff08;Windows\/Mac&#xff09;<\/h3>\n<h4>1. \u4e0b\u8f7d\u6e20\u9053<\/h4>\n<ul>\n<li>Oracle JDK&#xff1a;\u5b98\u65b9\u539f\u7248\u3002Java 8&#043; \u5546\u4e1a\u7528\u9014\u9700\u4ed8\u8d39&#xff0c;\u4e2a\u4eba\u5b66\u4e60\u514d\u8d39\u3002<\/li>\n<li>OpenJDK&#xff1a;\u5f00\u6e90\u514d\u8d39&#xff0c;\u4f01\u4e1a\u5e38\u7528\u3002<\/li>\n<li>\u5176\u4ed6\u53d1\u884c\u7248&#xff1a;Amazon Corretto, \u963f\u91cc Dragonwell, \u534e\u4e3a OpenJDK \u7b49\u3002<\/li>\n<li>\u63a8\u8350&#xff1a;\u521d\u5b66\u8005\u4f7f\u7528 Oracle JDK 8 \u6216 OpenJDK 8\u3002\u52a1\u5fc5\u9009\u62e9 LTS \u7248\u672c\u3002<\/li>\n<\/ul>\n<h4>2. Windows \u5b89\u88c5\u6b65\u9aa4<\/h4>\n<li>\u4e0b\u8f7d\u5b89\u88c5\u5305 (.exe)\u3002<\/li>\n<li>\u53cc\u51fb\u8fd0\u884c&#xff0c;\u4e00\u8def\u4e0b\u4e00\u6b65\u3002<\/li>\n<li>\u8def\u5f84\u5efa\u8bae&#xff1a;\u907f\u514d\u4e2d\u6587\u548c\u7a7a\u683c\u3002\u63a8\u8350 C:\\\\Java\\\\jdk1.8.0_xxx\u3002<\/li>\n<li>JRE \u53ef\u9009\u5b89\u88c5&#xff08;JDK \u5df2\u81ea\u5e26&#xff09;\u3002<\/li>\n<h4>3. Mac \u5b89\u88c5\u6b65\u9aa4<\/h4>\n<li>\u4e0b\u8f7d\u5b89\u88c5\u5305 (.dmg)\u3002<\/li>\n<li>\u53cc\u51fb\u6253\u5f00&#xff0c;\u6309\u63d0\u793a\u5b89\u88c5\u3002<\/li>\n<li>\u9ed8\u8ba4\u8def\u5f84&#xff1a;\/Library\/Java\/JavaVirtualMachines\/<\/li>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u5b89\u88c5\u8def\u5f84\u4e0d\u8981\u5305\u542b\u4e2d\u6587\u3001\u7a7a\u683c\u6216\u7279\u6b8a\u5b57\u7b26\u3002<\/li>\n<li>\u4e0b\u8f7d\u5bf9\u5e94\u7cfb\u7edf\u4f4d\u6570\u7684\u7248\u672c&#xff08;\u901a\u5e38\u9009 x64&#xff09;\u3002<\/li>\n<li>\u8bb0\u4f4f\u5b89\u88c5\u8def\u5f84&#xff0c;\u540e\u7eed\u914d\u7f6e\u73af\u5883\u53d8\u91cf\u9700\u7528\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 5 \u671f&#xff1a;\u914d\u7f6e\u73af\u5883\u53d8\u91cf&#xff08;JAVA_HOME \u4e0e Path&#xff09;<\/h3>\n<p>\u5b89\u88c5\u540e\u76f4\u63a5\u5728\u547d\u4ee4\u884c\u8f93\u5165 java \u62a5\u9519&#xff0c;\u662f\u56e0\u4e3a\u7cfb\u7edf\u627e\u4e0d\u5230\u547d\u4ee4\u8def\u5f84\u3002\u9700\u914d\u7f6e\u73af\u5883\u53d8\u91cf\u3002<\/p>\n<h4>1. \u5173\u952e\u53d8\u91cf<\/h4>\n<ul>\n<li>JAVA_HOME&#xff1a;\u6307\u5411 JDK \u5b89\u88c5\u6839\u76ee\u5f55&#xff08;\u4e0d\u542b bin&#xff09;\u3002\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u65b9\u4fbf\u5176\u4ed6\u8f6f\u4ef6&#xff08;Tomcat, Maven, IDEA \u7b49&#xff09;\u7edf\u4e00\u8bfb\u53d6 JDK \u4f4d\u7f6e\u3002<\/li>\n<\/ul>\n<\/li>\n<li>Path&#xff1a;\u6307\u5411 JDK \u7684 bin \u76ee\u5f55\u3002\n<ul>\n<li>\u4f5c\u7528&#xff1a;\u8ba9\u7cfb\u7edf\u5728\u4efb\u610f\u76ee\u5f55\u4e0b\u90fd\u80fd\u627e\u5230 java, javac \u7b49\u547d\u4ee4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2. Windows \u914d\u7f6e\u6b65\u9aa4<\/h4>\n<li>\u65b0\u5efa JAVA_HOME&#xff1a;\n<ul>\n<li>\u53f3\u952e\u201c\u6b64\u7535\u8111\u201d \u2192 \u5c5e\u6027 \u2192 \u9ad8\u7ea7\u7cfb\u7edf\u8bbe\u7f6e \u2192 \u73af\u5883\u53d8\u91cf\u3002<\/li>\n<li>\u7cfb\u7edf\u53d8\u91cf \u2192 \u65b0\u5efa&#xff1a;\u53d8\u91cf\u540d JAVA_HOME&#xff0c;\u53d8\u91cf\u503c C:\\\\Java\\\\jdk1.8.0_202 (\u793a\u4f8b\u8def\u5f84)\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u7f16\u8f91 Path&#xff1a;\n<ul>\n<li>\u7cfb\u7edf\u53d8\u91cf \u2192 \u627e\u5230 Path \u2192 \u7f16\u8f91\u3002<\/li>\n<li>\u65b0\u5efa\u6761\u76ee&#xff1a;%JAVA_HOME%\\\\bin\u3002<\/li>\n<li>\u91cd\u8981&#xff1a;\u5c06\u6b64\u6761\u76ee\u79fb\u52a8\u5230\u5217\u8868\u6700\u4e0a\u65b9&#xff0c;\u786e\u4fdd\u4f18\u5148\u4f7f\u7528\u81ea\u5df1\u5b89\u88c5\u7684 JDK\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u4fdd\u5b58\u9000\u51fa\u3002<\/li>\n<h4>3. Mac \u914d\u7f6e\u6b65\u9aa4<\/h4>\n<li>\u6253\u5f00\u7ec8\u7aef&#xff0c;\u7f16\u8f91\u914d\u7f6e\u6587\u4ef6 (~\/.zshrc \u6216 ~\/.bash_profile)\u3002<\/li>\n<li>\u6dfb\u52a0\u4ee5\u4e0b\u5185\u5bb9&#xff1a;<span class=\"token builtin class-name\">export<\/span> <span class=\"token assign-left variable\">JAVA_HOME<\/span><span class=\"token operator\">&#061;<\/span>\/Library\/Java\/JavaVirtualMachines\/jdk1.8.0_202.jdk\/Contents\/Home<br \/>\n<span class=\"token builtin class-name\">export<\/span> <span class=\"token assign-left variable\"><span class=\"token environment constant\">PATH<\/span><\/span><span class=\"token operator\">&#061;<\/span><span class=\"token variable\">$JAVA_HOME<\/span>\/bin:<span class=\"token environment constant\">$PATH<\/span><\/p>\n<\/li>\n<li>\u4f7f\u914d\u7f6e\u751f\u6548&#xff1a;source ~\/.zshrc<\/li>\n<hr \/>\n<h3>\u7b2c 6 \u671f&#xff1a;\u9a8c\u8bc1\u5b89\u88c5\u4e0e\u547d\u4ee4\u884c\u5e38\u7528\u6307\u4ee4<\/h3>\n<h4>1. \u9a8c\u8bc1\u5b89\u88c5<\/h4>\n<p>\u6253\u5f00\u547d\u4ee4\u884c (Win: cmd, Mac: Terminal)&#xff0c;\u8f93\u5165\u4ee5\u4e0b\u547d\u4ee4&#xff1a;<\/p>\n<p><span class=\"token comment\"># \u67e5\u770b Java \u7248\u672c<\/span><br \/>\n<span class=\"token function\">java<\/span> <span class=\"token parameter variable\">-version<\/span><\/p>\n<p><span class=\"token comment\"># \u67e5\u770b\u7f16\u8bd1\u5668\u7248\u672c<\/span><br \/>\njavac <span class=\"token parameter variable\">-version<\/span><\/p>\n<ul>\n<li>\u6210\u529f\u6807\u5fd7&#xff1a;\u663e\u793a\u7248\u672c\u53f7 (\u5982 1.8.0_202)\u3002<\/li>\n<li>\u5931\u8d25\u5904\u7406&#xff1a;\u82e5\u63d0\u793a\u201c\u4e0d\u662f\u5185\u90e8\u6216\u5916\u90e8\u547d\u4ee4\u201d&#xff0c;\u8bf7\u68c0\u67e5\u73af\u5883\u53d8\u91cf\u914d\u7f6e\u3002<\/li>\n<\/ul>\n<h4>2. \u5e38\u7528\u547d\u4ee4\u884c\u6307\u4ee4<\/h4>\n<table>\n<tr>\u4f5c\u7528WindowsMac \/ Linux<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u67e5\u770b\u5f53\u524d\u76ee\u5f55<\/td>\n<td align=\"left\">cd (\u65e0\u53c2)<\/td>\n<td align=\"left\">pwd<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5207\u6362\u76ee\u5f55<\/td>\n<td align=\"left\">cd \u8def\u5f84<\/td>\n<td align=\"left\">cd \u8def\u5f84<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u8fd4\u56de\u4e0a\u4e00\u7ea7<\/td>\n<td align=\"left\">cd ..<\/td>\n<td align=\"left\">cd ..<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5217\u51fa\u6587\u4ef6<\/td>\n<td align=\"left\">dir<\/td>\n<td align=\"left\">ls<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u521b\u5efa\u6587\u4ef6\u5939<\/td>\n<td align=\"left\">mkdir \u540d<\/td>\n<td align=\"left\">mkdir \u540d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5220\u9664\u6587\u4ef6<\/td>\n<td align=\"left\">del \u6587\u4ef6\u540d<\/td>\n<td align=\"left\">rm \u6587\u4ef6\u540d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6e05\u5c4f<\/td>\n<td align=\"left\">cls<\/td>\n<td align=\"left\">clear<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u6280\u5de7&#xff1a;\u4f7f\u7528 Tab \u952e\u53ef\u8fdb\u884c\u6587\u4ef6\u540d\/\u76ee\u5f55\u540d\u81ea\u52a8\u8865\u5168\u3002<\/li>\n<li>\u8def\u5f84\u6982\u5ff5&#xff1a;\n<ul>\n<li>\u7edd\u5bf9\u8def\u5f84&#xff1a;\u4ece\u6839\u76ee\u5f55\u5f00\u59cb\u7684\u5b8c\u6574\u8def\u5f84 (\u5982 C:\\\\Java\\\\&#8230;)\u3002<\/li>\n<li>\u76f8\u5bf9\u8def\u5f84&#xff1a;\u76f8\u5bf9\u4e8e\u5f53\u524d\u76ee\u5f55\u7684\u8def\u5f84 (\u5982 .\/src)\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 7 \u671f&#xff1a;\u7f16\u5199\u7b2c\u4e00\u4e2a HelloWorld \u7a0b\u5e8f<\/h3>\n<h4>1. \u521b\u5efa\u6587\u4ef6<\/h4>\n<ul>\n<li>\u65b0\u5efa\u6587\u672c\u6587\u4ef6&#xff0c;\u547d\u540d\u4e3a HelloWorld.java\u3002<\/li>\n<li>\u6ce8\u610f&#xff1a;\u5fc5\u987b\u663e\u793a\u6587\u4ef6\u6269\u5c55\u540d\u3002Windows \u9700\u5728\u201c\u67e5\u770b\u201d\u4e2d\u52fe\u9009\u201c\u6587\u4ef6\u6269\u5c55\u540d\u201d\u3002<\/li>\n<li>\u4e25\u7981&#xff1a;\u6587\u4ef6\u540d\u4e3a HelloWorld.java.txt\u3002<\/li>\n<\/ul>\n<h4>2. \u7f16\u5199\u4ee3\u7801<\/h4>\n<p>\u4f7f\u7528\u8bb0\u4e8b\u672c\u6216\u7f16\u8f91\u5668\u6253\u5f00&#xff0c;\u8f93\u5165&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HelloWorld<\/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\">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 World!&#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><\/p>\n<h4>3. \u5173\u952e\u89c4\u8303<\/h4>\n<li>\u6587\u4ef6\u540d\u4e0e\u7c7b\u540d\u4e00\u81f4&#xff1a;public class \u540e\u7684\u540d\u79f0\u5fc5\u987b\u4e0e\u6587\u4ef6\u540d\u5b8c\u5168\u5339\u914d&#xff08;\u533a\u5206\u5927\u5c0f\u5199&#xff09;\u3002<\/li>\n<li>\u7b26\u53f7\u89c4\u8303&#xff1a;\u6240\u6709\u62ec\u53f7\u3001\u5206\u53f7\u3001\u5f15\u53f7\u5fc5\u987b\u4e3a\u82f1\u6587\u534a\u89d2\u3002<\/li>\n<li>\u5927\u5c0f\u5199\u654f\u611f&#xff1a;System !&#061; system, String !&#061; string\u3002<\/li>\n<li>\u8bed\u53e5\u7ed3\u675f&#xff1a;\u6bcf\u884c\u8bed\u53e5\u5fc5\u987b\u4ee5\u5206\u53f7 ; \u7ed3\u5c3e\u3002<\/li>\n<hr \/>\n<h3>\u7b2c 8 \u671f&#xff1a;\u7f16\u8bd1\u4e0e\u8fd0\u884c Java \u7a0b\u5e8f (javac \u4e0e java)<\/h3>\n<h4>1. \u64cd\u4f5c\u6d41\u7a0b<\/h4>\n<li>\u5207\u6362\u76ee\u5f55&#xff1a;\u8fdb\u5165 .java \u6587\u4ef6\u6240\u5728\u76ee\u5f55\u3002<span class=\"token builtin class-name\">cd<\/span> D:<span class=\"token punctuation\">\\\\<\/span>code<span class=\"token punctuation\">\\\\<\/span>java_project\n<\/li>\n<li>\u7f16\u8bd1&#xff1a;\u4f7f\u7528 javac \u751f\u6210\u5b57\u8282\u7801\u3002javac HelloWorld.java\n<ul>\n<li>\u6210\u529f&#xff1a;\u65e0\u8f93\u51fa&#xff0c;\u76ee\u5f55\u4e0b\u751f\u6210 HelloWorld.class\u3002<\/li>\n<li>\u5931\u8d25&#xff1a;\u6839\u636e\u9519\u8bef\u4fe1\u606f\u4fee\u6b63\u62fc\u5199\u3001\u7b26\u53f7\u6216\u6587\u4ef6\u540d\u95ee\u9898\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8fd0\u884c&#xff1a;\u4f7f\u7528 java \u547d\u4ee4\u6267\u884c\u7c7b\u540d\u3002<span class=\"token function\">java<\/span> HelloWorld\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u53ea\u5199\u7c7b\u540d&#xff0c;\u4e0d\u8981\u52a0 .java \u6216 .class\u3002<\/li>\n<li>\u7ed3\u679c&#xff1a;\u63a7\u5236\u53f0\u8f93\u51fa Hello World!\u3002<\/li>\n<\/ul>\n<\/li>\n<h4>2. \u5e38\u89c1\u9519\u8bef<\/h4>\n<ul>\n<li>java HelloWorld.class&#xff1a;\u62a5\u9519&#xff0c;\u56e0\u4e3a JVM \u5bfb\u627e\u7684\u662f\u7c7b\u540d\u800c\u975e\u6587\u4ef6\u540d\u3002<\/li>\n<li>\u4e2d\u6587\u4e71\u7801&#xff1a;\u7f16\u8bd1\u65f6\u6307\u5b9a\u7f16\u7801 javac -encoding UTF-8 HelloWorld.java\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 9 \u671f&#xff1a;HelloWorld \u7a0b\u5e8f\u9010\u884c\u4ee3\u7801\u5256\u6790<\/h3>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HelloWorld<\/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\">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 World!&#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><\/p>\n<h4>1. \u7b2c\u4e00\u884c&#xff1a;\u7c7b\u7684\u5b9a\u4e49<\/h4>\n<p>public class HelloWorld {<\/p>\n<ul>\n<li>public&#xff1a;\u8bbf\u95ee\u4fee\u9970\u7b26&#xff0c;\u8868\u793a\u516c\u5f00\u53ef\u89c1\u3002<\/li>\n<li>class&#xff1a;\u5173\u952e\u5b57&#xff0c;\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u3002<\/li>\n<li>HelloWorld&#xff1a;\u7c7b\u540d\u3002<\/li>\n<li>{&#xff1a;\u7c7b\u4f53\u5f00\u59cb\u3002<\/li>\n<\/ul>\n<h4>2. \u7b2c\u4e8c\u884c&#xff1a;\u4e3b\u65b9\u6cd5 (\u5165\u53e3)<\/h4>\n<p>public static void main(String[] args) {<\/p>\n<ul>\n<li>public&#xff1a;\u516c\u5171\u6743\u9650&#xff0c;\u4f9b JVM \u8c03\u7528\u3002<\/li>\n<li>static&#xff1a;\u9759\u6001\u65b9\u6cd5&#xff0c;\u65e0\u9700\u5b9e\u4f8b\u5316\u5bf9\u8c61\u5373\u53ef\u8c03\u7528\u3002<\/li>\n<li>void&#xff1a;\u65e0\u8fd4\u56de\u503c\u3002<\/li>\n<li>main&#xff1a;\u65b9\u6cd5\u540d&#xff0c;\u56fa\u5b9a\u5199\u6cd5&#xff0c;JVM \u8bc6\u522b\u7684\u5165\u53e3\u3002<\/li>\n<li>(String[] args)&#xff1a;\u53c2\u6570\u5217\u8868&#xff0c;\u63a5\u6536\u547d\u4ee4\u884c\u5b57\u7b26\u4e32\u6570\u7ec4&#xff08;\u521d\u5b66\u8005\u6682\u5ffd\u7565&#xff09;\u3002<\/li>\n<\/ul>\n<h4>3. \u7b2c\u4e09\u884c&#xff1a;\u8f93\u51fa\u8bed\u53e5<\/h4>\n<p>System.out.println(&#034;Hello World!&#034;);<\/p>\n<ul>\n<li>System&#xff1a;\u7cfb\u7edf\u7c7b\u3002<\/li>\n<li>out&#xff1a;\u6807\u51c6\u8f93\u51fa\u6d41\u5bf9\u8c61\u3002<\/li>\n<li>println()&#xff1a;\u6253\u5370\u5e76\u6362\u884c\u65b9\u6cd5\u3002<\/li>\n<li>&#034;Hello World!&#034;&#xff1a;\u5b57\u7b26\u4e32\u5e38\u91cf\u3002<\/li>\n<li>;&#xff1a;\u8bed\u53e5\u7ed3\u675f\u7b26\u3002<\/li>\n<\/ul>\n<h4>4. \u603b\u7ed3<\/h4>\n<ul>\n<li>Java \u57fa\u672c\u5355\u4f4d\u662f\u7c7b\u3002<\/li>\n<li>\u7a0b\u5e8f\u5165\u53e3\u662f\u56fa\u5b9a\u7684 main \u65b9\u6cd5\u3002<\/li>\n<li>\u8f93\u51fa\u4f7f\u7528 System.out.println\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 10 \u671f&#xff1a;\u5f00\u53d1\u5de5\u5177 IDEA \u7684\u5b89\u88c5\u4e0e\u57fa\u7840\u914d\u7f6e<\/h3>\n<p>\u4e3a\u4e86\u63d0\u5347\u5f00\u53d1\u6548\u7387&#xff0c;\u5efa\u8bae\u4f7f\u7528\u96c6\u6210\u5f00\u53d1\u73af\u5883 (IDE)&#xff0c;\u9996\u9009 IntelliJ IDEA\u3002<\/p>\n<h4>1. \u7248\u672c\u9009\u62e9<\/h4>\n<ul>\n<li>Community (\u793e\u533a\u7248)&#xff1a;\u514d\u8d39&#xff0c;\u652f\u6301 Java SE&#xff0c;\u9002\u5408\u521d\u5b66\u8005\u3002<\/li>\n<li>Ultimate (\u65d7\u8230\u7248)&#xff1a;\u6536\u8d39&#xff0c;\u652f\u6301 Web\/EE \u7b49\u4f01\u4e1a\u7ea7\u5f00\u53d1\u3002<\/li>\n<\/ul>\n<h4>2. \u5b89\u88c5\u6b65\u9aa4<\/h4>\n<li>\u5b98\u7f51\u4e0b\u8f7d Community \u7248\u5b89\u88c5\u5305\u3002<\/li>\n<li>\u5b89\u88c5\u8def\u5f84\u907f\u514d\u4e2d\u6587\/\u7a7a\u683c\u3002<\/li>\n<li>\u63a8\u8350\u52fe\u9009\u9009\u9879&#xff1a;\n<ul>\n<li>Create Desktop Shortcut (\u684c\u9762\u5feb\u6377\u65b9\u5f0f)<\/li>\n<li>Update PATH Variable (\u547d\u4ee4\u884c\u53ef\u7528 idea \u547d\u4ee4)<\/li>\n<li>Update Context Menu (\u53f3\u952e\u83dc\u5355\u96c6\u6210)<\/li>\n<li>.java \u5173\u8054 (\u9ed8\u8ba4\u7528 IDEA \u6253\u5f00)<\/li>\n<\/ul>\n<\/li>\n<h4>3. \u9996\u6b21\u542f\u52a8\u4e0e\u754c\u9762<\/h4>\n<ul>\n<li>\u65b0\u5efa\u9879\u76ee (New Project)&#xff1a;\u9009\u62e9 Java \u8bed\u8a00&#xff0c;\u6307\u5b9a JDK 8\u3002<\/li>\n<li>\u754c\u9762\u533a\u57df&#xff1a;\n<ul>\n<li>\u5de6\u4fa7&#xff1a;\u9879\u76ee\u7ed3\u6784\u3002<\/li>\n<li>\u4e2d\u95f4&#xff1a;\u4ee3\u7801\u7f16\u8f91\u533a\u3002<\/li>\n<li>\u4e0b\u65b9&#xff1a;\u63a7\u5236\u53f0\/\u7ec8\u7aef\u3002<\/li>\n<li>\u9876\u90e8&#xff1a;\u83dc\u5355\u680f\/\u5de5\u5177\u680f\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>4. \u63a8\u8350\u57fa\u7840\u914d\u7f6e (File \u2192 Settings)<\/h4>\n<li>\u5b57\u4f53\u5927\u5c0f&#xff1a;Editor \u2192 Font&#xff0c;Size \u8bbe\u4e3a 16-18\u3002<\/li>\n<li>\u81ea\u52a8\u5bfc\u5305&#xff1a;Editor \u2192 General \u2192 Auto Import&#xff0c;\u52fe\u9009\u76f8\u5173\u9009\u9879\u3002<\/li>\n<li>\u6eda\u8f6e\u7f29\u653e\u5b57\u4f53&#xff1a;Editor \u2192 General&#xff0c;\u52fe\u9009 Change font size with Ctrl&#043;Mouse Wheel\u3002<\/li>\n<li>\u663e\u793a\u884c\u53f7&#xff1a;Editor \u2192 General \u2192 Appearance \u2192 Show line numbers\u3002<\/li>\n<li>\u6587\u4ef6\u7f16\u7801&#xff1a;Editor \u2192 File Encodings&#xff0c;\u5168\u5c40\u548c\u9879\u76ee\u7f16\u7801\u5747\u8bbe\u4e3a UTF-8 (\u9632\u6b62\u4e2d\u6587\u4e71\u7801)\u3002<\/li>\n<hr \/>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 11-20 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u4ece IDE \u5b9e\u64cd\u5165\u624b&#xff0c;\u6df1\u5165\u8bb2\u89e3 Java \u57fa\u7840\u8bed\u6cd5\u6838\u5fc3\u6982\u5ff5&#xff0c;\u5305\u62ec\u5173\u952e\u5b57\u3001\u6807\u8bc6\u7b26\u3001\u6ce8\u91ca\u3001\u5e38\u91cf\u3001\u57fa\u672c\u6570\u636e\u7c7b\u578b&#xff08;\u6574\u6570\u3001\u6d6e\u70b9\u3001\u5b57\u7b26\u3001\u5e03\u5c14&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 11 \u671f&#xff1a;IDEA \u4e2d\u521b\u5efa\u9879\u76ee\u4e0e\u8fd0\u884c\u7a0b\u5e8f<\/h3>\n<h4>1. \u521b\u5efa\u65b0\u9879\u76ee<\/h4>\n<p>\u6253\u5f00 IntelliJ IDEA&#xff0c;\u70b9\u51fb New Project&#xff0c;\u914d\u7f6e\u5982\u4e0b&#xff1a;<\/p>\n<ul>\n<li>Name&#xff1a;\u9879\u76ee\u540d\u79f0&#xff0c;\u5982 JavaStudy\u3002<\/li>\n<li>Location&#xff1a;\u9879\u76ee\u8def\u5f84&#xff0c;\u907f\u514d\u4e2d\u6587\u548c\u7a7a\u683c\u3002<\/li>\n<li>Language&#xff1a;\u9009\u62e9 Java\u3002<\/li>\n<li>JDK&#xff1a;\u9009\u62e9\u5df2\u5b89\u88c5\u7684 JDK 8&#xff08;\u82e5\u672a\u68c0\u6d4b\u5230\u9700\u624b\u52a8\u6dfb\u52a0&#xff09;\u3002<\/li>\n<li>Build system&#xff1a;\u9009\u62e9 IntelliJ&#xff08;\u521d\u5b66\u8005\u6682\u4e0d\u4f7f\u7528 Maven\/Gradle&#xff09;\u3002<\/li>\n<\/ul>\n<h4>2. \u521b\u5efa\u7c7b<\/h4>\n<ul>\n<li>\u5728\u5de6\u4fa7\u9879\u76ee\u7ed3\u6784\u7684 src \u6587\u4ef6\u5939\u4e0a\u53f3\u952e \u2192 New \u2192 Java Class\u3002<\/li>\n<li>\u8f93\u5165\u7c7b\u540d&#xff08;\u5982 HelloWorld&#xff09;&#xff0c;\u56de\u8f66\u3002<\/li>\n<li>IDEA \u4f1a\u81ea\u52a8\u751f\u6210\u7c7b\u7ed3\u6784&#xff1a;<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HelloWorld<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>3. \u7f16\u5199\u4ee3\u7801\u4e0e\u5feb\u6377\u952e<\/h4>\n<ul>\n<li>\u751f\u6210 main \u65b9\u6cd5&#xff1a;\u8f93\u5165 psvm \u7136\u540e\u6309 Tab \u952e\u3002<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 punctuation\">}<\/span><\/p>\n<\/li>\n<li>\u751f\u6210\u8f93\u51fa\u8bed\u53e5&#xff1a;\u5728 main \u65b9\u6cd5\u4e2d\u8f93\u5165 sout \u7136\u540e\u6309 Tab \u952e\u3002<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>\n<\/li>\n<li>\u5b8c\u6574\u793a\u4f8b&#xff1a;<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HelloWorld<\/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\">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 IDEA!&#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><\/p>\n<\/li>\n<\/ul>\n<h4>4. \u8fd0\u884c\u7a0b\u5e8f<\/h4>\n<p>\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u8fd0\u884c&#xff1a;<\/p>\n<li>\u70b9\u51fb main \u65b9\u6cd5\u5de6\u4fa7\u7684\u7eff\u8272\u5c0f\u4e09\u89d2\u3002<\/li>\n<li>\u53f3\u952e\u4ee3\u7801\u7f16\u8f91\u533a \u2192 Run \u2018HelloWorld.main()\u2019\u3002<\/li>\n<li>\u5feb\u6377\u952e&#xff1a;Ctrl&#043;Shift&#043;F10 (Windows) \/ Control&#043;Shift&#043;R (Mac)\u3002<\/li>\n<li>\u70b9\u51fb\u53f3\u4e0a\u89d2\u7eff\u8272\u64ad\u653e\u6309\u94ae\u3002<\/li>\n<ul>\n<li>\u7ed3\u679c\u67e5\u770b&#xff1a;\u4e0b\u65b9\u63a7\u5236\u53f0\u8f93\u51fa Hello IDEA! \u53ca Process finished with exit code 0&#xff08;0 \u8868\u793a\u6b63\u5e38\u9000\u51fa&#xff09;\u3002<\/li>\n<li>\u4f18\u52bf&#xff1a;IDEA \u81ea\u52a8\u5b8c\u6210\u7f16\u8bd1\u548c\u8fd0\u884c&#xff0c;\u65e0\u9700\u624b\u52a8\u6572\u547d\u4ee4\u3002<\/li>\n<\/ul>\n<h4>5. \u5e38\u7528\u64cd\u4f5c<\/h4>\n<ul>\n<li>\u65b0\u5efa\u5305&#xff1a;src \u53f3\u952e \u2192 New \u2192 Package&#xff08;\u7528\u4e8e\u5206\u7c7b\u7ba1\u7406\u4ee3\u7801&#xff09;\u3002<\/li>\n<li>\u91cd\u547d\u540d&#xff1a;\u9009\u4e2d\u6587\u4ef6 \u2192 Shift&#043;F6&#xff08;IDEA \u4f1a\u81ea\u52a8\u66f4\u65b0\u6240\u6709\u5f15\u7528&#xff09;\u3002<\/li>\n<li>\u4ee3\u7801\u63d0\u793a&#xff1a;\u8f93\u5165\u90e8\u5206\u5b57\u6bcd\u540e&#xff0c;IDEA \u4f1a\u81ea\u52a8\u8865\u5168&#xff0c;\u5584\u7528\u6b64\u529f\u80fd\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 12 \u671f&#xff1a;IDEA \u5e38\u7528\u5feb\u6377\u952e\u4e0e\u8c03\u8bd5\u6280\u5de7\u5165\u95e8<\/h3>\n<p>\u719f\u7ec3\u638c\u63e1\u5feb\u6377\u952e\u53ef\u5927\u5e45\u63d0\u5347\u5f00\u53d1\u6548\u7387\u3002<\/p>\n<h4>1. \u6838\u5fc3\u5feb\u6377\u952e\u901f\u67e5\u8868<\/h4>\n<table>\n<tr>\u7c7b\u522bWindows \u5feb\u6377\u952eMac \u5feb\u6377\u952e\u4f5c\u7528<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u751f\u6210\u4ee3\u7801<\/td>\n<td align=\"left\">psvm &#043; Tab<\/td>\n<td align=\"left\">psvm &#043; Tab<\/td>\n<td align=\"left\">\u751f\u6210 main \u65b9\u6cd5<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">sout &#043; Tab<\/td>\n<td align=\"left\">sout &#043; Tab<\/td>\n<td align=\"left\">\u751f\u6210 System.out.println()<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u7f16\u8f91<\/td>\n<td align=\"left\">Ctrl &#043; D<\/td>\n<td align=\"left\">Cmd &#043; D<\/td>\n<td align=\"left\">\u590d\u5236\u5f53\u524d\u884c\u5230\u4e0b\u4e00\u884c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Ctrl &#043; Y<\/td>\n<td align=\"left\">Cmd &#043; Backspace<\/td>\n<td align=\"left\">\u5220\u9664\u5f53\u524d\u884c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Ctrl &#043; \/<\/td>\n<td align=\"left\">Cmd &#043; \/<\/td>\n<td align=\"left\">\u5355\u884c\u6ce8\u91ca\/\u53d6\u6d88\u6ce8\u91ca<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Ctrl &#043; Shift &#043; \/<\/td>\n<td align=\"left\">Cmd &#043; Shift &#043; \/<\/td>\n<td align=\"left\">\u591a\u884c\u6ce8\u91ca\/\u53d6\u6d88\u6ce8\u91ca<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Ctrl &#043; Alt &#043; L<\/td>\n<td align=\"left\">Option &#043; Cmd &#043; L<\/td>\n<td align=\"left\">\u683c\u5f0f\u5316\u4ee3\u7801&#xff08;\u81ea\u52a8\u5bf9\u9f50&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Alt &#043; Enter<\/td>\n<td align=\"left\">Option &#043; Enter<\/td>\n<td align=\"left\">\u4e07\u80fd\u4fee\u590d\u952e&#xff08;\u5bfc\u5305\u3001\u4fee\u9519\u3001\u63d0\u53d6\u65b9\u6cd5\u7b49&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Ctrl &#043; Alt &#043; V<\/td>\n<td align=\"left\">Option &#043; Cmd &#043; V<\/td>\n<td align=\"left\">\u81ea\u52a8\u751f\u6210\u53d8\u91cf<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u67e5\u627e<\/td>\n<td align=\"left\">Ctrl &#043; F<\/td>\n<td align=\"left\">Cmd &#043; F<\/td>\n<td align=\"left\">\u5f53\u524d\u6587\u4ef6\u67e5\u627e<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Ctrl &#043; Shift &#043; F<\/td>\n<td align=\"left\">Cmd &#043; Shift &#043; F<\/td>\n<td align=\"left\">\u5168\u5c40\u67e5\u627e<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">\u53cc\u51fb Shift<\/td>\n<td align=\"left\">\u53cc\u51fb Shift<\/td>\n<td align=\"left\">\u4e07\u80fd\u641c\u7d22&#xff08;\u641c\u7c7b\u3001\u6587\u4ef6\u3001\u8bbe\u7f6e\u7b49&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u8fd0\u884c\/\u8c03\u8bd5<\/td>\n<td align=\"left\">Ctrl &#043; Shift &#043; F10<\/td>\n<td align=\"left\">Control &#043; R<\/td>\n<td align=\"left\">\u8fd0\u884c\u5f53\u524d\u7a0b\u5e8f<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Ctrl &#043; Shift &#043; F9<\/td>\n<td align=\"left\">Control &#043; D<\/td>\n<td align=\"left\">\u8c03\u8bd5\u8fd0\u884c\u5f53\u524d\u7a0b\u5e8f<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">F8<\/td>\n<td align=\"left\">F8<\/td>\n<td align=\"left\">\u5355\u6b65\u6267\u884c&#xff08;\u4e0d\u8fdb\u5165\u65b9\u6cd5\u5185\u90e8&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">F7<\/td>\n<td align=\"left\">F7<\/td>\n<td align=\"left\">\u5355\u6b65\u6267\u884c&#xff08;\u8fdb\u5165\u65b9\u6cd5\u5185\u90e8&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">F9<\/td>\n<td align=\"left\">F9<\/td>\n<td align=\"left\">\u7ee7\u7eed\u6267\u884c&#xff08;\u81f3\u4e0b\u4e00\u4e2a\u65ad\u70b9&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\"><\/td>\n<td align=\"left\">Ctrl &#043; F2<\/td>\n<td align=\"left\">Cmd &#043; F2<\/td>\n<td align=\"left\">\u505c\u6b62\u7a0b\u5e8f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2. \u8c03\u8bd5 (Debug) \u6280\u5de7\u5165\u95e8<\/h4>\n<p>\u8c03\u8bd5\u662f\u5b9a\u4f4d Bug \u7684\u6838\u5fc3\u624b\u6bb5&#xff0c;\u8ba9\u7a0b\u5e8f\u4e00\u6b65\u6b65\u6267\u884c\u5e76\u89c2\u5bdf\u53d8\u91cf\u503c\u3002<\/p>\n<li>\u8bbe\u7f6e\u65ad\u70b9&#xff1a;\u5728\u4ee3\u7801\u884c\u53f7\u5de6\u4fa7\u70b9\u51fb&#xff0c;\u51fa\u73b0\u7ea2\u8272\u5706\u70b9\u3002<\/li>\n<li>\u542f\u52a8\u8c03\u8bd5&#xff1a;\u70b9\u51fb Debug \u56fe\u6807&#xff08;\u866b\u5b50\u5f62\u72b6&#xff09;\u6216\u6309\u8c03\u8bd5\u5feb\u6377\u952e\u3002<\/li>\n<li>\u6682\u505c\u89c2\u5bdf&#xff1a;\u7a0b\u5e8f\u8fd0\u884c\u81f3\u65ad\u70b9\u5904\u6682\u505c&#xff0c;\u67e5\u770b\u4e0b\u65b9 Debug \u9762\u677f\u4e2d\u7684\u53d8\u91cf\u503c\u3002<\/li>\n<li>\u9010\u6b65\u6267\u884c&#xff1a;\n<ul>\n<li>F7&#xff1a;Step Into&#xff08;\u8fdb\u5165\u65b9\u6cd5&#xff09;\u3002<\/li>\n<li>F8&#xff1a;Step Over&#xff08;\u8df3\u8fc7\u65b9\u6cd5&#xff0c;\u4e0d\u8fdb\u5165&#xff09;\u3002<\/li>\n<li>F9&#xff1a;Resume Program&#xff08;\u7ee7\u7eed\u8fd0\u884c\u76f4\u5230\u4e0b\u4e00\u4e2a\u65ad\u70b9&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u7ed3\u675f\u8c03\u8bd5&#xff1a;\u627e\u5230\u95ee\u9898\u540e&#xff0c;\u4fee\u6539\u4ee3\u7801\u5e76\u91cd\u65b0\u8fd0\u884c\u3002<\/li>\n<hr \/>\n<h3>\u7b2c 13 \u671f&#xff1a;\u5173\u952e\u5b57\u4e0e\u4fdd\u7559\u5b57\u7684\u533a\u522b<\/h3>\n<h4>1. \u5173\u952e\u5b57 (Keyword)<\/h4>\n<ul>\n<li>\u5b9a\u4e49&#xff1a;Java \u8bed\u8a00\u4e2d\u88ab\u8d4b\u4e88\u7279\u6b8a\u542b\u4e49\u7684\u5355\u8bcd\u3002<\/li>\n<li>\u7279\u70b9&#xff1a;\n<ul>\n<li>\u5168\u90e8\u4e3a\u5c0f\u5199\u3002<\/li>\n<li>\u5177\u6709\u7279\u5b9a\u7528\u9014&#xff08;\u5982\u5b9a\u4e49\u7c7b\u3001\u53d8\u91cf\u3001\u6d41\u7a0b\u63a7\u5236\u7b49&#xff09;\u3002<\/li>\n<li>\u5728 IDEA \u4e2d\u901a\u5e38\u663e\u793a\u4e3a\u84dd\u8272\u6216\u7d2b\u8272\u9ad8\u4eae\u3002<\/li>\n<li>\u4e0d\u80fd\u7528\u4f5c\u7c7b\u540d\u3001\u65b9\u6cd5\u540d\u3001\u53d8\u91cf\u540d\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5e38\u89c1\u5206\u7c7b&#xff1a;\n<ul>\n<li>\u4fee\u9970\u7b26&#xff1a;public, private, protected, static, final, abstract<\/li>\n<li>\u6d41\u7a0b\u63a7\u5236&#xff1a;if, else, switch, case, while, for, break, continue, return<\/li>\n<li>\u6570\u636e\u7c7b\u578b&#xff1a;int, long, double, char, boolean, true, false, null<\/li>\n<li>\u9762\u5411\u5bf9\u8c61&#xff1a;class, interface, extends, implements, new, this, super<\/li>\n<li>\u5f02\u5e38\u5904\u7406&#xff1a;try, catch, finally, throw, throws<\/li>\n<li>\u5176\u4ed6&#xff1a;package, import, synchronized, volatile, enum<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2. \u4fdd\u7559\u5b57 (Reserved Word)<\/h4>\n<ul>\n<li>\u5b9a\u4e49&#xff1a;Java \u76ee\u524d\u672a\u4f7f\u7528&#xff0c;\u4f46\u9884\u7559\u4f9b\u672a\u6765\u7248\u672c\u53ef\u80fd\u4f7f\u7528\u7684\u5173\u952e\u5b57\u3002<\/li>\n<li>\u6570\u91cf&#xff1a;\u4ec5\u4e24\u4e2a \u2014\u2014 const \u548c goto\u3002<\/li>\n<li>\u539f\u56e0&#xff1a;\n<ul>\n<li>const&#xff1a;Java \u4f7f\u7528 final \u5b9a\u4e49\u5e38\u91cf&#xff0c;\u6545\u4fdd\u7559 const\u3002<\/li>\n<li>goto&#xff1a;Java \u8ba4\u4e3a goto \u5bb9\u6613\u5bfc\u81f4\u4ee3\u7801\u903b\u8f91\u6df7\u4e71&#xff0c;\u6545\u5e9f\u5f03&#xff0c;\u4f46\u4ecd\u4fdd\u7559\u8be5\u8bcd\u7981\u6b62\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>3. \u603b\u7ed3<\/h4>\n<ul>\n<li>\u5171\u540c\u70b9&#xff1a;\u90fd\u4e0d\u80fd\u4f5c\u4e3a\u6807\u8bc6\u7b26&#xff08;\u540d\u5b57&#xff09;\u4f7f\u7528\u3002<\/li>\n<li>\u5224\u65ad\u65b9\u6cd5&#xff1a;\u5728 IDEA \u4e2d\u8f93\u5165&#xff0c;\u82e5\u53d8\u8272\u5219\u4e3a\u5173\u952e\u5b57\/\u4fdd\u7559\u5b57&#xff1b;\u82e5\u4e3a\u9ed1\u8272\u5219\u4e0d\u662f\u3002<\/li>\n<li>\u6ce8\u610f&#xff1a;true, false, null \u867d\u5e38\u88ab\u89c6\u4e3a\u5b57\u9762\u91cf&#xff0c;\u4f46\u5728\u6807\u8bc6\u7b26\u89c4\u5219\u4e2d\u540c\u6837\u4e0d\u53ef\u7528\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 14 \u671f&#xff1a;\u6807\u8bc6\u7b26\u7684\u547d\u540d\u89c4\u5219\u4e0e\u89c4\u8303<\/h3>\n<p>\u6807\u8bc6\u7b26\u662f\u7ed9\u7c7b\u3001\u65b9\u6cd5\u3001\u53d8\u91cf\u7b49\u8d77\u7684\u540d\u5b57\u3002<\/p>\n<h4>1. \u547d\u540d\u89c4\u5219&#xff08;\u5fc5\u987b\u9075\u5b88&#xff0c;\u5426\u5219\u62a5\u9519&#xff09;<\/h4>\n<li>\u7ec4\u6210\u5b57\u7b26&#xff1a;\u5b57\u6bcd\u3001\u6570\u5b57\u3001\u4e0b\u5212\u7ebf _\u3001\u7f8e\u5143\u7b26\u53f7 $\u3002<\/li>\n<li>\u5f00\u5934\u9650\u5236&#xff1a;\u4e0d\u80fd\u4ee5\u6570\u5b57\u5f00\u5934\u3002<\/li>\n<li>\u5173\u952e\u5b57\u9650\u5236&#xff1a;\u4e0d\u80fd\u662f\u5173\u952e\u5b57\u6216\u4fdd\u7559\u5b57\u3002<\/li>\n<li>\u5927\u5c0f\u5199\u654f\u611f&#xff1a;Age \u548c age \u662f\u4e0d\u540c\u7684\u6807\u8bc6\u7b26\u3002<\/li>\n<li>\u957f\u5ea6&#xff1a;\u7406\u8bba\u4e0a\u65e0\u9650\u5236\u3002<\/li>\n<p>\u793a\u4f8b&#xff1a;<\/p>\n<ul>\n<li>\u2705 age, studentName, _hello, $money, abc123<\/li>\n<li>\u274c 123abc (\u6570\u5b57\u5f00\u5934), class (\u5173\u952e\u5b57), my-name (\u542b\u51cf\u53f7)<\/li>\n<li>\u26a0\ufe0f \u6211\u7684\u540d\u5b57 (\u5408\u6cd5\u4f46\u4e0d\u63a8\u8350&#xff0c;\u6613\u5bfc\u81f4\u7f16\u7801\u95ee\u9898\u548c\u53ef\u8bfb\u6027\u5dee)<\/li>\n<\/ul>\n<h4>2. \u547d\u540d\u89c4\u8303&#xff08;\u5efa\u8bae\u9075\u5b88&#xff0c;\u4f53\u73b0\u4e13\u4e1a\u6027&#xff09;<\/h4>\n<table>\n<tr>\u7c7b\u578b\u89c4\u8303\u540d\u79f0\u89c4\u5219\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u7c7b\u540d\/\u63a5\u53e3\u540d<\/td>\n<td align=\"left\">\u5927\u9a7c\u5cf0 (UpperCamelCase)<\/td>\n<td align=\"left\">\u6bcf\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199<\/td>\n<td align=\"left\">HelloWorld, UserService<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u65b9\u6cd5\u540d\/\u53d8\u91cf\u540d<\/td>\n<td align=\"left\">\u5c0f\u9a7c\u5cf0 (lowerCamelCase)<\/td>\n<td align=\"left\">\u7b2c\u4e00\u4e2a\u5355\u8bcd\u5c0f\u5199&#xff0c;\u540e\u7eed\u5355\u8bcd\u9996\u5b57\u6bcd\u5927\u5199<\/td>\n<td align=\"left\">main, userName, getInfo<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5e38\u91cf\u540d<\/td>\n<td align=\"left\">\u5168\u5927\u5199<\/td>\n<td align=\"left\">\u5168\u90e8\u5927\u5199&#xff0c;\u5355\u8bcd\u95f4\u7528\u4e0b\u5212\u7ebf\u5206\u9694<\/td>\n<td align=\"left\">MAX_SIZE, PI, DEFAULT_VALUE<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5305\u540d<\/td>\n<td align=\"left\">\u5168\u5c0f\u5199<\/td>\n<td align=\"left\">\u5168\u90e8\u5c0f\u5199&#xff0c;\u7528\u70b9\u5206\u9694\u5c42\u7ea7<\/td>\n<td align=\"left\">com.example.demo, java.util<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3. \u6838\u5fc3\u539f\u5219&#xff1a;\u89c1\u540d\u77e5\u610f<\/h4>\n<ul>\n<li>\u597d\u4f8b\u5b50&#xff1a;age, studentName, calculateSum<\/li>\n<li>\u574f\u4f8b\u5b50&#xff1a;a, b, test, helloworld (\u7c7b\u540d\u672a\u5927\u5199)<\/li>\n<li>\u7406\u7531&#xff1a;\u4ee3\u7801\u662f\u7ed9\u4eba\u770b\u7684&#xff0c;\u6e05\u6670\u7684\u540d\u5b57\u80fd\u50cf\u6587\u7ae0\u4e00\u6837\u987a\u7545\u9605\u8bfb&#xff0c;\u51cf\u5c11\u7ef4\u62a4\u6210\u672c\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 15 \u671f&#xff1a;\u6ce8\u91ca\u7684\u4e09\u79cd\u65b9\u5f0f<\/h3>\n<p>\u6ce8\u91ca\u662f\u5199\u7ed9\u7a0b\u5e8f\u5458\u770b\u7684\u8bf4\u660e&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u5ffd\u7565\u3002<\/p>\n<h4>1. \u5355\u884c\u6ce8\u91ca<\/h4>\n<ul>\n<li>\u8bed\u6cd5&#xff1a;\/\/ \u6ce8\u91ca\u5185\u5bb9<\/li>\n<li>\u7528\u6cd5&#xff1a;\u89e3\u91ca\u5355\u884c\u4ee3\u7801\u6216\u884c\u5c3e\u8865\u5145\u8bf4\u660e\u3002<\/li>\n<li>\u5feb\u6377\u952e&#xff1a;Ctrl &#043; \/ (Win) \/ Cmd &#043; \/ (Mac)<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/ \u8fd9\u662f\u4e00\u4e2a\u5355\u884c\u6ce8\u91ca<\/span><br \/>\n<span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5b9a\u4e49\u5e74\u9f84\u53d8\u91cf<\/span><\/p>\n<h4>2. \u591a\u884c\u6ce8\u91ca<\/h4>\n<ul>\n<li>\u8bed\u6cd5&#xff1a;\/* \u6ce8\u91ca\u5185\u5bb9 *\/<\/li>\n<li>\u7528\u6cd5&#xff1a;\u6ce8\u91ca\u5927\u5757\u4ee3\u7801\u6216\u591a\u884c\u8bf4\u660e\u3002\u6ce8\u610f&#xff1a;\u4e0d\u80fd\u5d4c\u5957\u4f7f\u7528\u3002<\/li>\n<li>\u5feb\u6377\u952e&#xff1a;Ctrl &#043; Shift &#043; \/ (Win) \/ Cmd &#043; Shift &#043; \/ (Mac)<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/*<br \/>\n \u8fd9\u662f\u4e00\u4e2a\u591a\u884c\u6ce8\u91ca<br \/>\n \u53ef\u4ee5\u5305\u542b\u591a\u884c\u6587\u5b57<br \/>\n*\/<\/span><\/p>\n<h4>3. \u6587\u6863\u6ce8\u91ca (Javadoc)<\/h4>\n<ul>\n<li>\u8bed\u6cd5&#xff1a;\/** \u6ce8\u91ca\u5185\u5bb9 *\/<\/li>\n<li>\u7528\u6cd5&#xff1a;\u4e13\u95e8\u7528\u4e8e\u751f\u6210 API \u6587\u6863&#xff0c;\u5199\u5728\u7c7b\u3001\u65b9\u6cd5\u3001\u5b57\u6bb5\u4e0a\u65b9\u3002<\/li>\n<li>\u5e38\u7528\u6807\u7b7e&#xff1a;\n<ul>\n<li>&#064;author&#xff1a;\u4f5c\u8005<\/li>\n<li>&#064;version&#xff1a;\u7248\u672c\u53f7<\/li>\n<li>&#064;param&#xff1a;\u53c2\u6570\u8bf4\u660e<\/li>\n<li>&#064;return&#xff1a;\u8fd4\u56de\u503c\u8bf4\u660e<\/li>\n<li>&#064;deprecated&#xff1a;\u5df2\u5e9f\u5f03<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/**<br \/>\n * \u8ba1\u7b97\u5706\u7684\u9762\u79ef<br \/>\n * &#064;param radius \u534a\u5f84<br \/>\n * &#064;return \u9762\u79ef<br \/>\n *\/<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token function\">calculateArea<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span> radius<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><\/p>\n<h4>4. \u6ce8\u91ca\u539f\u5219<\/h4>\n<ul>\n<li>\u8981\u5199&#xff1a;\u7c7b\u548c\u65b9\u6cd5\u7684\u6587\u6863\u6ce8\u91ca\u3001\u590d\u6742\u4e1a\u52a1\u903b\u8f91\u7684\u89e3\u91ca\u3001\u7279\u6b8a\u5904\u7406\u7684\u201c\u5751\u201d\u3002<\/li>\n<li>\u4e0d\u8981\u5199&#xff1a;\u5e9f\u8bdd\u6ce8\u91ca&#xff08;\u5982 int a &#061; 1; \/\/ a\u7b49\u4e8e1&#xff09;\u3001\u8fc7\u65f6\u6ce8\u91ca&#xff08;\u4ee3\u7801\u6539\u4e86\u6ce8\u91ca\u6ca1\u6539\u6bd4\u6ca1\u6ce8\u91ca\u66f4\u5751&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 16 \u671f&#xff1a;\u5e38\u91cf\u7684\u5b9a\u4e49\u4e0e final \u5173\u952e\u5b57<\/h3>\n<h4>1. \u5e38\u91cf\u5206\u7c7b<\/h4>\n<ul>\n<li>\u5b57\u9762\u5e38\u91cf&#xff1a;\u76f4\u63a5\u5199\u51fa\u7684\u56fa\u5b9a\u503c&#xff0c;\u5982 123, &#034;Hello&#034;, true, null\u3002<\/li>\n<li>\u81ea\u5b9a\u4e49\u5e38\u91cf&#xff1a;\u4f7f\u7528 final \u5173\u952e\u5b57\u4fee\u9970\u7684\u53d8\u91cf&#xff0c;\u503c\u4e00\u65e6\u786e\u5b9a\u4e0d\u53ef\u66f4\u6539\u3002<\/li>\n<\/ul>\n<h4>2. final \u5173\u952e\u5b57<\/h4>\n<ul>\n<li>\u4fee\u9970\u53d8\u91cf&#xff1a;\u53d8\u4e3a\u5e38\u91cf&#xff0c;\u521d\u59cb\u5316\u540e\u4e0d\u53ef\u91cd\u65b0\u8d4b\u503c\u3002<\/li>\n<li>\u4fee\u9970\u65b9\u6cd5&#xff1a;\u4e0d\u80fd\u88ab\u91cd\u5199&#xff08;Override&#xff09;\u3002<\/li>\n<li>\u4fee\u9970\u7c7b&#xff1a;\u4e0d\u80fd\u88ab\u7ee7\u627f&#xff08;Extend&#xff09;\u3002<\/li>\n<\/ul>\n<h4>3. \u5b9a\u4e49\u4e0e\u4f7f\u7528<\/h4>\n<p><span class=\"token comment\">\/\/ \u8bed\u6cd5&#xff1a;final \u6570\u636e\u7c7b\u578b \u5e38\u91cf\u540d &#061; \u503c;<\/span><br \/>\n<span class=\"token keyword\">final<\/span> <span class=\"token keyword\">double<\/span> <span class=\"token constant\">PI<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.1415926<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token constant\">MAX_SIZE<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef\u793a\u8303<\/span><br \/>\n<span class=\"token keyword\">final<\/span> <span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span><br \/>\nage <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7f16\u8bd1\u62a5\u9519&#xff01;Cannot assign a value to final variable &#039;age&#039;<\/span><\/p>\n<h4>4. \u4f7f\u7528\u573a\u666f<\/h4>\n<li>\u56fa\u5b9a\u4e0d\u53d8\u7684\u503c&#xff1a;\u5982\u5706\u5468\u7387 PI\u3002<\/li>\n<li>\u66ff\u4ee3\u9b54\u6cd5\u503c&#xff1a;\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002\n<ul>\n<li>Bad: if (age &gt; 18)<\/li>\n<li>Good: final int ADULT_AGE &#061; 18; if (age &gt; ADULT_AGE)<\/li>\n<\/ul>\n<\/li>\n<li>\u4fbf\u4e8e\u7ef4\u62a4&#xff1a;\u591a\u5904\u5f15\u7528\u7684\u503c&#xff0c;\u53ea\u9700\u4fee\u6539\u5e38\u91cf\u5b9a\u4e49\u4e00\u5904\u5373\u53ef\u3002<\/li>\n<h4>5. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u5c40\u90e8\u5e38\u91cf\u5fc5\u987b\u5728\u5b9a\u4e49\u65f6\u521d\u59cb\u5316\u3002<\/li>\n<li>\u5e38\u91cf\u540d\u89c4\u8303&#xff1a;\u5168\u5927\u5199 &#043; \u4e0b\u5212\u7ebf\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 17 \u671f&#xff1a;\u57fa\u672c\u6570\u636e\u7c7b\u578b\u5206\u7c7b&#xff08;8 \u5927\u57fa\u672c\u7c7b\u578b&#xff09;<\/h3>\n<p>Java \u6570\u636e\u7c7b\u578b\u5206\u4e3a\u57fa\u672c\u7c7b\u578b\u548c\u5f15\u7528\u7c7b\u578b\u3002\u672c\u671f\u91cd\u70b9\u8bb2\u89e3 8 \u5927\u57fa\u672c\u6570\u636e\u7c7b\u578b&#xff0c;\u53e3\u8bc0&#xff1a;\u201c\u56db\u7c7b\u516b\u79cd\u201d\u3002<\/p>\n<h4>1. \u6574\u6570\u7c7b\u578b (4 \u79cd)<\/h4>\n<table>\n<tr>\u7c7b\u578b\u5b57\u8282\u8303\u56f4\u9ed8\u8ba4\u503c\u5907\u6ce8<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">byte<\/td>\n<td align=\"left\">1<\/td>\n<td align=\"left\">-128 ~ 127<\/td>\n<td align=\"left\">0<\/td>\n<td align=\"left\">\u6781\u5c11\u7528&#xff0c;\u8282\u7701\u7a7a\u95f4\u573a\u666f<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">short<\/td>\n<td align=\"left\">2<\/td>\n<td align=\"left\">-32768 ~ 32767<\/td>\n<td align=\"left\">0<\/td>\n<td align=\"left\">\u6781\u5c11\u7528<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">int<\/td>\n<td align=\"left\">4<\/td>\n<td align=\"left\">\u00b121\u4ebf<\/td>\n<td align=\"left\">0<\/td>\n<td align=\"left\">\u6700\u5e38\u7528<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">long<\/td>\n<td align=\"left\">8<\/td>\n<td align=\"left\">\u00b1900\u4ebf\u4ebf<\/td>\n<td align=\"left\">0L<\/td>\n<td align=\"left\">\u5927\u6570\u3001\u65f6\u95f4\u6233<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u6574\u6570\u9ed8\u8ba4\u7c7b\u578b\u4e3a int\u3002\u5b9a\u4e49 long \u9700\u52a0\u540e\u7f00 L\u3002<\/li>\n<\/ul>\n<h4>2. \u6d6e\u70b9\u7c7b\u578b (2 \u79cd)<\/h4>\n<table>\n<tr>\u7c7b\u578b\u5b57\u8282\u7cbe\u5ea6\u9ed8\u8ba4\u503c\u5907\u6ce8<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">float<\/td>\n<td align=\"left\">4<\/td>\n<td align=\"left\">6-7\u4f4d\u6709\u6548\u6570\u5b57<\/td>\n<td align=\"left\">0.0f<\/td>\n<td align=\"left\">\u9700\u52a0\u540e\u7f00 f<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">double<\/td>\n<td align=\"left\">8<\/td>\n<td align=\"left\">15-16\u4f4d\u6709\u6548\u6570\u5b57<\/td>\n<td align=\"left\">0.0<\/td>\n<td align=\"left\">\u6700\u5e38\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u5c0f\u6570\u9ed8\u8ba4\u7c7b\u578b\u4e3a double\u3002\u5b9a\u4e49 float \u9700\u52a0\u540e\u7f00 f\u3002<\/li>\n<li>\u8b66\u544a&#xff1a;\u6d6e\u70b9\u6570\u8fd0\u7b97\u5b58\u5728\u7cbe\u5ea6\u8bef\u5dee&#xff0c;\u4e25\u7981\u7528\u4e8e\u91d1\u989d\u8ba1\u7b97&#xff08;\u9700\u7528 BigDecimal&#xff09;\u3002<\/li>\n<\/ul>\n<h4>3. \u5b57\u7b26\u7c7b\u578b (1 \u79cd)<\/h4>\n<ul>\n<li>char: 2 \u5b57\u8282&#xff0c;Unicode \u7f16\u7801&#xff0c;\u53d6\u503c 0~65535\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;&#039;a&#039;, &#039;\u4e2d&#039;, &#039;\\\\n&#039;<\/li>\n<\/ul>\n<h4>4. \u5e03\u5c14\u7c7b\u578b (1 \u79cd)<\/h4>\n<ul>\n<li>boolean: 1 \u5b57\u8282&#xff08;\u89c4\u8303\u672a\u4e25\u683c\u89c4\u5b9a&#xff09;&#xff0c;\u53ea\u6709 true \u6216 false\u3002<\/li>\n<li>\u7528\u4e8e\u6761\u4ef6\u5224\u65ad\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 18 \u671f&#xff1a;\u6574\u6570\u7c7b\u578b\u8be6\u89e3 (byte, short, int, long)<\/h3>\n<h4>1. \u5404\u7c7b\u578b\u8be6\u89e3<\/h4>\n<ul>\n<li>byte: \u6700\u5c0f\u5355\u4f4d&#xff0c;\u5e38\u7528\u4e8e\u7f51\u7edc\u4f20\u8f93\u3001\u6587\u4ef6\u8bfb\u5199\u5e95\u5c42\u6570\u636e\u3002<\/li>\n<li>short: \u4ecb\u4e8e byte \u548c int \u4e4b\u95f4&#xff0c;\u73b0\u4ee3\u5f00\u53d1\u4e2d\u5f88\u5c11\u4f7f\u7528\u3002<\/li>\n<li>int: \u4e3b\u529b\u519b\u3002\u7edd\u5927\u591a\u6570\u8ba1\u6570\u3001\u7d22\u5f15\u3001ID \u90fd\u4f7f\u7528 int\u3002<\/li>\n<li>long: \u5f53\u6570\u503c\u8d85\u8fc7 int \u8303\u56f4\u65f6\u4f7f\u7528\u3002\n<ul>\n<li>\u5178\u578b\u573a\u666f&#xff1a;System.currentTimeMillis() \u8fd4\u56de\u7684\u65f6\u95f4\u6233\u3002<\/li>\n<li>\u5199\u6cd5&#xff1a;long num &#061; 10000000000L; (\u52a1\u5fc5\u52a0 L&#xff0c;\u9632\u6b62\u6ea2\u51fa)\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>2. \u8fdb\u5236\u8868\u793a<\/h4>\n<p>Java \u652f\u6301\u591a\u79cd\u8fdb\u5236\u7684\u5b57\u9762\u91cf\u8868\u793a&#xff0c;\u6253\u5370\u65f6\u9ed8\u8ba4\u8f6c\u4e3a\u5341\u8fdb\u5236&#xff1a;<\/p>\n<ul>\n<li>\u5341\u8fdb\u5236&#xff1a;123<\/li>\n<li>\u4e8c\u8fdb\u5236&#xff1a;0b1010 (\u4ee5 0b \u5f00\u5934)<\/li>\n<li>\u516b\u8fdb\u5236&#xff1a;012 (\u4ee5 0 \u5f00\u5934)<\/li>\n<li>\u5341\u516d\u8fdb\u5236&#xff1a;0xA (\u4ee5 0x \u5f00\u5934)<\/li>\n<\/ul>\n<h4>3. \u6570\u5b57\u53ef\u89c6\u5316\u589e\u5f3a (Java 7&#043;)<\/h4>\n<p>\u53ef\u4ee5\u5728\u6570\u5b57\u4e2d\u95f4\u52a0\u4e0b\u5212\u7ebf _ \u63d0\u9ad8\u53ef\u8bfb\u6027&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5ffd\u7565&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> million <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1_000_000<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ 100\u4e07<\/span><br \/>\n<span class=\"token keyword\">long<\/span> billion <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1_000_000_000L<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 10\u4ebf<\/span><\/p>\n<h4>4. \u7ecf\u9a8c\u603b\u7ed3<\/h4>\n<li>\u65e5\u5e38\u5f00\u53d1\u9996\u9009 int\u3002<\/li>\n<li>\u8d85\u5927\u6570\u9009 long&#xff0c;\u8bb0\u5f97\u52a0 L\u3002<\/li>\n<li>\u6ce8\u610f\u6ea2\u51fa\u95ee\u9898&#xff0c;\u786e\u4fdd\u6570\u636e\u5728\u7c7b\u578b\u8303\u56f4\u5185\u3002<\/li>\n<hr \/>\n<h3>\u7b2c 19 \u671f&#xff1a;\u6d6e\u70b9\u7c7b\u578b\u8be6\u89e3 (float vs double)<\/h3>\n<h4>1. \u6838\u5fc3\u533a\u522b<\/h4>\n<ul>\n<li>precision (\u7cbe\u5ea6): double &gt; float\u3002<\/li>\n<li>memory (\u5185\u5b58): double \u5360\u7528\u66f4\u591a\u5185\u5b58\u3002<\/li>\n<li>\u9ed8\u8ba4\u7c7b\u578b: \u4ee3\u7801\u4e2d\u5199\u7684\u5c0f\u6570\u9ed8\u8ba4\u662f double\u3002<\/li>\n<\/ul>\n<h4>2. \u5b9a\u4e49\u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">float<\/span> f <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.14f<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5fc5\u987b\u52a0 f\/F<\/span><br \/>\n<span class=\"token keyword\">double<\/span> d <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.14<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u9ed8\u8ba4\u5c31\u662f double&#xff0c;d\/D \u53ef\u9009<\/span><br \/>\n<span class=\"token keyword\">double<\/span> d2 <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.14d<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>3. \u7cbe\u5ea6\u9677\u9631 (\u91cd\u8981!)<\/h4>\n<p>\u8ba1\u7b97\u673a\u4f7f\u7528\u4e8c\u8fdb\u5236\u5b58\u50a8\u5c0f\u6570&#xff0c;\u90e8\u5206\u5341\u8fdb\u5236\u5c0f\u6570\u65e0\u6cd5\u7cbe\u786e\u8868\u793a&#xff08;\u7c7b\u4f3c 1\/3 &#061; 0.333\u2026&#xff09;\u3002<\/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 number\">0.1<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">0.2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa: 0.30000000000000004<\/span><\/p>\n<ul>\n<li>\u7ed3\u8bba&#xff1a;\u6d89\u53ca\u91d1\u94b1\u3001\u7cbe\u786e\u8ba1\u7b97\u7684\u573a\u666f&#xff0c;\u7edd\u5bf9\u7981\u6b62\u4f7f\u7528 float\/double&#xff0c;\u5fc5\u987b\u4f7f\u7528 java.math.BigDecimal\u3002<\/li>\n<\/ul>\n<h4>4. \u7279\u6b8a\u503c<\/h4>\n<ul>\n<li>Infinity: \u6b63\u65e0\u7a77 (1.0 \/ 0)<\/li>\n<li>-Infinity: \u8d1f\u65e0\u7a77 (-1.0 \/ 0)<\/li>\n<li>NaN: \u975e\u6570\u5b57 (0.0 \/ 0.0)\u3002\u6ce8\u610f&#xff1a;NaN &#061;&#061; NaN \u7ed3\u679c\u4e3a false&#xff0c;\u5224\u65ad\u9700\u7528 Double.isNaN()\u3002<\/li>\n<\/ul>\n<h4>5. \u79d1\u5b66\u8ba1\u6570\u6cd5<\/h4>\n<p><span class=\"token keyword\">double<\/span> e2 <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.14e2<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ 314.0<\/span><br \/>\n<span class=\"token keyword\">double<\/span> eNeg3 <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.14e-3<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 0.00314<\/span><\/p>\n<hr \/>\n<h3>\u7b2c 20 \u671f&#xff1a;\u5b57\u7b26\u7c7b\u578b char \u4e0e Unicode \u7f16\u7801<\/h3>\n<h4>1. char \u57fa\u7840<\/h4>\n<ul>\n<li>\u5360\u4f4d&#xff1a;2 \u5b57\u8282 (16 bit)&#xff0c;\u8303\u56f4 0~65535\u3002<\/li>\n<li>\u8bed\u6cd5&#xff1a;\u5355\u5f15\u53f7 &#039; &#039;&#xff0c;\u53ea\u80fd\u5b58\u4e00\u4e2a\u5b57\u7b26\u3002<span class=\"token keyword\">char<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">char<\/span> c2 <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;\u4e2d&#039;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ char c3 &#061; &#034;ab&#034;; \/\/ \u9519\u8bef&#xff0c;\u8fd9\u662f\u5b57\u7b26\u4e32<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>2. char \u7684\u672c\u8d28&#xff1a;\u6570\u5b57<\/h4>\n<p>char \u5728\u5e95\u5c42\u5b58\u50a8\u7684\u662f\u5b57\u7b26\u5bf9\u5e94\u7684 Unicode \u7f16\u7801\u503c\u3002<\/p>\n<ul>\n<li>\u9690\u5f0f\u8f6c\u6362&#xff1a;char \u53c2\u4e0e\u7b97\u672f\u8fd0\u7b97\u65f6&#xff0c;\u81ea\u52a8\u63d0\u5347\u4e3a int\u3002<span class=\"token keyword\">char<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;a&#039;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ ASCII 97<\/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>c <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 comment\">\/\/ \u8f93\u51fa 98<\/span><\/p>\n<\/li>\n<li>\u5f3a\u5236\u8f6c\u6362&#xff1a;\u53ef\u4ee5\u5c06\u6570\u5b57\u8d4b\u7ed9 char&#xff0c;\u663e\u793a\u5bf9\u5e94\u5b57\u7b26\u3002<span class=\"token keyword\">char<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">97<\/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>c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa a<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>3. \u5173\u952e\u7f16\u7801\u503c (ASCII)<\/h4>\n<p>\u8bb0\u4f4f\u4ee5\u4e0b\u5e38\u7528\u5b57\u7b26\u7684\u7f16\u7801&#xff0c;\u6709\u52a9\u4e8e\u7406\u89e3\u5b57\u7b26\u8fd0\u7b97&#xff1a;<\/p>\n<ul>\n<li>&#039;0&#039; &#061; 48<\/li>\n<li>&#039;A&#039; &#061; 65<\/li>\n<li>&#039;a&#039; &#061; 97<\/li>\n<li>\u5927\u5c0f\u5199\u5dee\u503c&#xff1a;32 (&#039;a&#039; &#8211; &#039;A&#039; &#061; 32)<\/li>\n<\/ul>\n<h4>4. \u8f6c\u4e49\u5b57\u7b26 ($<\/h4>\n<p>\u7528\u4e8e\u8868\u793a\u7279\u6b8a\u63a7\u5236\u5b57\u7b26&#xff1a;<\/p>\n<table>\n<tr>\u8f6c\u4e49\u7b26\u542b\u4e49\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\\\\n<\/td>\n<td align=\"left\">\u6362\u884c<\/td>\n<td align=\"left\">&#034;Line1\\\\nLine2&#034;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\\\\t<\/td>\n<td align=\"left\">\u5236\u8868\u7b26<\/td>\n<td align=\"left\">&#034;Name\\\\tAge&#034;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\\\\\\\\<\/td>\n<td align=\"left\">\u53cd\u659c\u6760<\/td>\n<td align=\"left\">&#034;C:\\\\\\\\Path&#034;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\\\\&#039;<\/td>\n<td align=\"left\">\u5355\u5f15\u53f7<\/td>\n<td align=\"left\">char c &#061; &#039;\\\\&#039;&#039;;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\\\\&#034;<\/td>\n<td align=\"left\">\u53cc\u5f15\u53f7<\/td>\n<td align=\"left\">String s &#061; &#034;\\\\&#034;Hello\\\\&#034;&#034;;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\\\\uXXXX<\/td>\n<td align=\"left\">Unicode \u5b57\u7b26<\/td>\n<td align=\"left\">&#039;\\\\u4e2d&#039; (\u4e2d)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>5. \u5e38\u89c1\u5e94\u7528<\/h4>\n<ul>\n<li>\u5927\u5c0f\u5199\u8f6c\u6362&#xff1a;\u5229\u7528 ASCII \u5dee\u503c 32\u3002<span class=\"token keyword\">char<\/span> upper <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span>c <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5c0f\u8f6c\u5927<\/span><br \/>\n<span class=\"token keyword\">char<\/span> lower <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">char<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span>c <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">32<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5927\u8f6c\u5c0f<\/span><\/p>\n<\/li>\n<li>\u7c7b\u578b\u5224\u65ad&#xff1a;\u901a\u8fc7\u8303\u56f4\u5224\u65ad\u5b57\u7b26\u7c7b\u578b\u3002<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>c <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token char\">&#039;0&#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> c <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token char\">&#039;9&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u6570\u5b57 *\/<\/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>c <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token char\">&#039;a&#039;<\/span> <span class=\"token operator\">&amp;&amp;<\/span> c <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token char\">&#039;z&#039;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/* \u5c0f\u5199\u5b57\u6bcd *\/<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 21-30 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u6df1\u5165\u8bb2\u89e3\u57fa\u672c\u6570\u636e\u7c7b\u578b\u7684\u7ec6\u8282\u3001\u53d8\u91cf\u7ba1\u7406\u3001\u7c7b\u578b\u8f6c\u6362\u3001\u5b57\u7b26\u4e32\u64cd\u4f5c\u3001Scanner \u8f93\u5165\u5904\u7406\u4ee5\u53ca\u683c\u5f0f\u5316\u8f93\u51fa&#xff0c;\u5e76\u901a\u8fc7\u7efc\u5408\u6848\u4f8b\u5de9\u56fa\u57fa\u7840\u8bed\u6cd5\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 21 \u671f&#xff1a;\u5e03\u5c14\u7c7b\u578b boolean \u7684\u7279\u6b8a\u6027<\/h3>\n<h4>1. \u57fa\u672c\u7528\u6cd5<\/h4>\n<p>boolean \u7c7b\u578b\u53ea\u6709\u4e24\u4e2a\u503c&#xff1a;true \u548c false\u3002<\/p>\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u5fc5\u987b\u5c0f\u5199&#xff0c;\u5b83\u4eec\u662f\u5173\u952e\u5b57&#xff0c;\u4e0d\u80fd\u4f5c\u4e3a\u6807\u8bc6\u7b26\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">boolean<\/span> flag <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/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>flag<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa true<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>2. \u7279\u6b8a\u6027<\/h4>\n<p>\u4e0e\u5176\u4ed6\u57fa\u672c\u7c7b\u578b\u76f8\u6bd4&#xff0c;boolean \u6709\u4ee5\u4e0b\u7279\u70b9&#xff1a;<\/p>\n<li>\u53d6\u503c\u552f\u4e00&#xff1a;\u4ec5 true \/ false\u3002<\/li>\n<li>\u4e0d\u53ef\u8f6c\u6362&#xff1a;\u4e0d\u80fd\u4e0e\u6574\u6570\u3001\u6d6e\u70b9\u6570\u7b49\u76f8\u4e92\u8f6c\u6362\u3002&#xff08;\u4e0d\u540c\u4e8e C \u8bed\u8a00\u4e2d 0 \u4e3a\u5047\u3001\u975e 0 \u4e3a\u771f&#xff09;\u3002\n<ul>\n<li>\u274c int a &#061; true; (\u7f16\u8bd1\u62a5\u9519)<\/li>\n<li>\u274c boolean b &#061; 1; (\u7f16\u8bd1\u62a5\u9519)<\/li>\n<\/ul>\n<\/li>\n<li>\u5185\u5b58\u5360\u7528\u672a\u660e\u786e\u89c4\u5b9a&#xff1a;\u89c4\u8303\u672a\u89c4\u5b9a\u5177\u4f53\u5b57\u8282\u6570&#xff0c;\u901a\u5e38\u5355\u72ec\u53d8\u91cf\u5360 4 \u5b57\u8282&#xff08;\u7c7b\u4f3c int&#xff09;&#xff0c;\u6570\u7ec4\u4e2d\u5360 1 \u5b57\u8282\u3002<\/li>\n<h4>3. \u4f7f\u7528\u573a\u666f<\/h4>\n<ul>\n<li>\u6761\u4ef6\u5224\u65ad&#xff1a;if, while, for \u7684\u6761\u4ef6\u8868\u8fbe\u5f0f\u5fc5\u987b\u662f boolean \u7c7b\u578b\u3002<\/li>\n<li>\u65b9\u6cd5\u8fd4\u56de\u503c&#xff1a;\u7528\u4e8e\u8fd4\u56de\u903b\u8f91\u5224\u65ad\u7ed3\u679c&#xff08;\u5982 isEven(), isValid()&#xff09;\u3002<\/li>\n<li>\u6807\u5fd7\u4f4d&#xff1a;\u8bb0\u5f55\u72b6\u6001&#xff08;\u5982 isFinished, isVisible&#xff09;\u3002<\/li>\n<\/ul>\n<h4>4. \u547d\u540d\u5efa\u8bae<\/h4>\n<p>\u53d8\u91cf\u540d\u5efa\u8bae\u4ee5 is, has, can, should \u5f00\u5934&#xff0c;\u89c1\u540d\u77e5\u610f\u3002<\/p>\n<ul>\n<li>\u2705 isAdult, hasNext, canRun<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 22 \u671f&#xff1a;\u53d8\u91cf\u7684\u58f0\u660e\u4e0e\u521d\u59cb\u5316<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<p>\u53d8\u91cf\u662f\u5185\u5b58\u4e2d\u7684\u4e00\u5757\u5b58\u50a8\u7a7a\u95f4&#xff0c;\u5177\u6709\u7c7b\u578b\u3001\u540d\u5b57\u548c\u503c\u3002<\/p>\n<h4>2. \u8bed\u6cd5\u6b65\u9aa4<\/h4>\n<li>\u58f0\u660e&#xff1a;\u544a\u8bc9\u7f16\u8bd1\u5668\u53d8\u91cf\u7684\u7c7b\u578b\u548c\u540d\u5b57\u3002<span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">double<\/span> salary<span class=\"token punctuation\">;<\/span><\/p>\n<\/li>\n<li>\u521d\u59cb\u5316&#xff08;\u8d4b\u503c&#xff09;&#xff1a;\u7ed9\u53d8\u91cf\u8d4b\u4e88\u521d\u59cb\u503c\u3002age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span>\n<\/li>\n<li>\u58f0\u660e\u5e76\u521d\u59cb\u5316&#xff08;\u63a8\u8350&#xff09;&#xff1a;<span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span>\n<\/li>\n<h4>3. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<li>\u5148\u58f0\u660e\u540e\u4f7f\u7528&#xff1a;\u672a\u58f0\u660e\u7684\u53d8\u91cf\u65e0\u6cd5\u8bbf\u95ee\u3002<\/li>\n<li>\u5c40\u90e8\u53d8\u91cf\u5fc5\u987b\u5148\u521d\u59cb\u5316&#xff1a;\u5728\u65b9\u6cd5\u5185\u5b9a\u4e49\u7684\u53d8\u91cf&#xff0c;\u82e5\u672a\u8d4b\u503c&#xff0c;Java \u4e0d\u5141\u8bb8\u8bfb\u53d6&#xff08;\u56e0\u4e3a\u6808\u5185\u5b58\u4e2d\u7684\u503c\u662f\u968f\u673a\u7684\u5783\u573e\u503c&#xff09;\u3002<\/li>\n<li>\u4f5c\u7528\u57df\u5185\u4e0d\u53ef\u91cd\u540d&#xff1a;\u540c\u4e00\u4f5c\u7528\u57df\u5185\u4e0d\u80fd\u6709\u540c\u540d\u53d8\u91cf\u3002<\/li>\n<li>\u5f3a\u7c7b\u578b\u8bed\u8a00&#xff1a;\u53d8\u91cf\u7c7b\u578b\u786e\u5b9a\u540e\u4e0d\u53ef\u66f4\u6539&#xff08;\u5982 int \u53ea\u80fd\u5b58\u6574\u6570&#xff09;\u3002<\/li>\n<hr \/>\n<h3>\u7b2c 23 \u671f&#xff1a;\u53d8\u91cf\u7684\u4f5c\u7528\u57df\u4e0e\u751f\u547d\u5468\u671f<\/h3>\n<h4>1. \u4f5c\u7528\u57df (Scope)<\/h4>\n<p>\u53d8\u91cf\u80fd\u8d77\u4f5c\u7528\u7684\u8303\u56f4&#xff0c;\u5373\u4ee3\u7801\u4e2d\u53ef\u4ee5\u8bbf\u95ee\u8be5\u53d8\u91cf\u7684\u533a\u57df\u3002<\/p>\n<ul>\n<li>\u89c4\u5219&#xff1a;\n<ul>\n<li>\u53d8\u91cf\u5728\u5176\u6240\u5728\u7684\u5927\u62ec\u53f7 {} \u5185\u6709\u6548\u3002<\/li>\n<li>\u5185\u90e8\u53ef\u4ee5\u8bbf\u95ee\u5916\u90e8\u53d8\u91cf\u3002<\/li>\n<li>\u5916\u90e8\u4e0d\u80fd\u8bbf\u95ee\u5185\u90e8\u53d8\u91cf\u3002<\/li>\n<li>\u4e0d\u540c\u4f5c\u7528\u57df\u53ef\u4ee5\u6709\u540c\u540d\u53d8\u91cf&#xff08;\u4f46\u4e0d\u5efa\u8bae&#xff0c;\u6613\u6df7\u6dc6&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ScopeTest<\/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 keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&gt;<\/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> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/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>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5408\u6cd5&#xff0c;\u8bbf\u95ee\u5916\u90e8\u53d8\u91cf<\/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>b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5408\u6cd5&#xff0c;\u8bbf\u95ee\u5185\u90e8\u53d8\u91cf<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token comment\">\/\/ System.out.println(b); \/\/ \u62a5\u9519&#xff01;b \u5df2\u8d85\u51fa\u4f5c\u7528\u57df<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2. \u751f\u547d\u5468\u671f (Life Cycle)<\/h4>\n<p>\u53d8\u91cf\u4ece\u521b\u5efa\u5230\u9500\u6bc1\u7684\u65f6\u95f4\u6bb5\u3002<\/p>\n<ul>\n<li>\u5c40\u90e8\u53d8\u91cf&#xff1a;\n<ul>\n<li>\u521b\u5efa&#xff1a;\u6267\u884c\u5230\u58f0\u660e\u884c\u65f6\u5206\u914d\u5185\u5b58\u3002<\/li>\n<li>\u9500\u6bc1&#xff1a;\u79bb\u5f00\u4f5c\u7528\u57df&#xff08;\u5982\u65b9\u6cd5\u7ed3\u675f&#xff09;\u65f6\u5185\u5b58\u88ab\u56de\u6536\u3002<\/li>\n<li>\u6bcf\u6b21\u8c03\u7528\u65b9\u6cd5\u90fd\u4f1a\u91cd\u65b0\u521b\u5efa\u65b0\u7684\u5c40\u90e8\u53d8\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 24 \u671f&#xff1a;\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362&#xff08;\u9690\u5f0f\u8f6c\u6362&#xff09;<\/h3>\n<h4>1. \u5b9a\u4e49<\/h4>\n<p>\u5f53\u5c0f\u8303\u56f4\u7c7b\u578b\u7684\u6570\u636e\u8d4b\u503c\u7ed9\u5927\u8303\u56f4\u7c7b\u578b\u7684\u53d8\u91cf\u65f6&#xff0c;Java \u81ea\u52a8\u5b8c\u6210\u8f6c\u6362&#xff0c;\u65e0\u9700\u4eba\u5de5\u5e72\u9884\u3002<\/p>\n<h4>2. \u8f6c\u6362\u987a\u5e8f&#xff08;\u7531\u5c0f\u5230\u5927&#xff09;<\/h4>\n<p>byte \u2192 short \u2192 int \u2192 long \u2192 float \u2192 double<br \/>\n                \u2191<br \/>\n               char<\/p>\n<ul>\n<li>\u6ce8\u610f&#xff1a;\n<ul>\n<li>boolean \u4e0d\u53c2\u4e0e\u4efb\u4f55\u7c7b\u578b\u8f6c\u6362\u3002<\/li>\n<li>float \u867d\u7136\u53ea\u6709 4 \u5b57\u8282&#xff0c;\u4f46\u8868\u793a\u8303\u56f4\u6bd4 long (8 \u5b57\u8282) \u5927&#xff0c;\u6240\u4ee5 long \u53ef\u81ea\u52a8\u8f6c\u4e3a float\u3002<\/li>\n<li>char \u53ef\u81ea\u52a8\u8f6c\u4e3a int \u53ca\u4ee5\u4e0a\u7c7b\u578b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>3. \u8868\u8fbe\u5f0f\u4e2d\u7684\u7c7b\u578b\u63d0\u5347<\/h4>\n<ul>\n<li>\u89c4\u5219 1&#xff1a;byte, short, char \u53c2\u4e0e\u8fd0\u7b97\u65f6&#xff0c;\u81ea\u52a8\u63d0\u5347\u4e3a int\u3002<span class=\"token keyword\">byte<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ byte c &#061; a &#043; b; \/\/ \u62a5\u9519&#xff01;\u7ed3\u679c\u662f int<\/span><br \/>\n<span class=\"token keyword\">int<\/span> c <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">;<\/span>     <span class=\"token comment\">\/\/ \u6b63\u786e<\/span><\/p>\n<\/li>\n<li>\u89c4\u5219 2&#xff1a;\u6df7\u5408\u8fd0\u7b97\u4e2d&#xff0c;\u6574\u4e2a\u8868\u8fbe\u5f0f\u63d0\u5347\u4e3a\u7cbe\u5ea6\/\u8303\u56f4\u6700\u5927\u7684\u7c7b\u578b\u3002<span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">double<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.14<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">double<\/span> c <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ a \u81ea\u52a8\u8f6c\u4e3a double&#xff0c;\u7ed3\u679c\u4e3a double<\/span><\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 25 \u671f&#xff1a;\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362&#xff08;\u663e\u5f0f\u8f6c\u6362&#xff09;\u4e0e\u7cbe\u5ea6\u4e22\u5931<\/h3>\n<h4>1. \u5b9a\u4e49<\/h4>\n<p>\u5c06\u5927\u8303\u56f4\u7c7b\u578b\u8f6c\u6362\u4e3a\u5c0f\u8303\u56f4\u7c7b\u578b\u65f6&#xff0c;\u5fc5\u987b\u624b\u52a8\u6307\u5b9a&#xff0c;\u79f0\u4e3a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u3002<\/p>\n<ul>\n<li>\u8bed\u6cd5&#xff1a;(\u76ee\u6807\u7c7b\u578b) \u503c<\/li>\n<\/ul>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">)<\/span> a<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5f3a\u5236\u8f6c\u6362<\/span><\/p>\n<h4>2. \u98ce\u9669&#xff1a;\u7cbe\u5ea6\u4e22\u5931\u4e0e\u6ea2\u51fa<\/h4>\n<ul>\n<li>\u6570\u503c\u6ea2\u51fa&#xff1a;\u5982\u679c\u503c\u8d85\u51fa\u76ee\u6807\u7c7b\u578b\u8303\u56f4&#xff0c;\u4f1a\u53d1\u751f\u622a\u65ad&#xff0c;\u5bfc\u81f4\u7ed3\u679c\u9519\u8bef\u3002<span class=\"token keyword\">int<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">200<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">byte<\/span> d <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">)<\/span> c<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa -56 (\u6ea2\u51fa)<\/span><\/p>\n<\/li>\n<li>\u5c0f\u6570\u622a\u65ad&#xff1a;\u6d6e\u70b9\u8f6c\u6574\u6570\u65f6&#xff0c;\u76f4\u63a5\u4e22\u5f03\u5c0f\u6570\u90e8\u5206&#xff0c;\u4e0d\u662f\u56db\u820d\u4e94\u5165\u3002<span class=\"token keyword\">double<\/span> d <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3.99<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">)<\/span> d<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ed3\u679c\u4e3a 3<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>3. \u7279\u6b8a\u573a\u666f<\/h4>\n<ul>\n<li>byte\/short \u8fd0\u7b97&#xff1a;\u7ed3\u679c\u9ed8\u8ba4\u4e3a int&#xff0c;\u8d4b\u503c\u56de\u539f\u7c7b\u578b\u9700\u5f3a\u8f6c\u3002<span class=\"token keyword\">byte<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">byte<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5fc5\u987b\u52a0\u62ec\u53f7\u6574\u4f53\u5f3a\u8f6c<\/span>\n<\/li>\n<li>\u5e38\u91cf\u4f18\u5316&#xff1a;\u5982\u679c\u8d4b\u503c\u7684\u662f\u5e38\u91cf\u4e14\u503c\u5728\u8303\u56f4\u5185&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u5904\u7406&#xff0c;\u65e0\u9700\u5f3a\u8f6c\u3002<span class=\"token keyword\">byte<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5408\u6cd5&#xff0c;100 \u5728 byte \u8303\u56f4\u5185<\/span><br \/>\n<span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ byte b2 &#061; a; \/\/ \u62a5\u9519&#xff0c;\u53d8\u91cf a \u7684\u503c\u4e0d\u786e\u5b9a<\/span><\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 26 \u671f&#xff1a;\u5b57\u7b26\u4e32 String \u7684\u57fa\u7840\u5165\u95e8<\/h3>\n<h4>1. \u57fa\u672c\u6982\u5ff5<\/h4>\n<ul>\n<li>String \u662f\u5f15\u7528\u7c7b\u578b&#xff08;\u7c7b&#xff09;&#xff0c;\u4e0d\u662f\u57fa\u672c\u7c7b\u578b\u3002<\/li>\n<li>\u7528\u53cc\u5f15\u53f7 &#034;&#034; \u8868\u793a\u3002<\/li>\n<li>\u4e0d\u53ef\u53d8\u6027&#xff1a;\u5b57\u7b26\u4e32\u5bf9\u8c61\u4e00\u65e6\u521b\u5efa&#xff0c;\u5185\u5bb9\u4e0d\u53ef\u6539\u53d8\u3002\u4fee\u6539\u64cd\u4f5c&#xff08;\u5982 toUpperCase&#xff09;\u8fd4\u56de\u7684\u662f\u65b0\u5b57\u7b26\u4e32\u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<h4>2. \u5b9a\u4e49\u65b9\u5f0f<\/h4>\n<p><span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ \u63a8\u8350&#xff1a;\u76f4\u63a5\u91cf<\/span><br \/>\n<span class=\"token class-name\">String<\/span> s2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;Hello&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f83\u5c11\u7528<\/span><\/p>\n<h4>3. \u5e38\u7528\u65b9\u6cd5<\/h4>\n<table>\n<tr>\u65b9\u6cd5\u8bf4\u660e\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">length()<\/td>\n<td align=\"left\">\u83b7\u53d6\u957f\u5ea6<\/td>\n<td align=\"left\">&#034;abc&#034;.length() -&gt; 3<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">charAt(index)<\/td>\n<td align=\"left\">\u83b7\u53d6\u6307\u5b9a\u4f4d\u7f6e\u5b57\u7b26<\/td>\n<td align=\"left\">&#034;abc&#034;.charAt(0) -&gt; \u2018a\u2019<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">equals(obj)<\/td>\n<td align=\"left\">\u6bd4\u8f83\u5185\u5bb9\u662f\u5426\u76f8\u7b49<\/td>\n<td align=\"left\">&#034;abc&#034;.equals(&#034;abc&#034;) -&gt; true<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">toUpperCase()<\/td>\n<td align=\"left\">\u8f6c\u5927\u5199<\/td>\n<td align=\"left\">&#034;abc&#034;.toUpperCase() -&gt; \u201cABC\u201d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">toLowerCase()<\/td>\n<td align=\"left\">\u8f6c\u5c0f\u5199<\/td>\n<td align=\"left\">&#034;ABC&#034;.toLowerCase() -&gt; \u201cabc\u201d<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">contains(s)<\/td>\n<td align=\"left\">\u662f\u5426\u5305\u542b\u5b50\u4e32<\/td>\n<td align=\"left\">&#034;hello&#034;.contains(&#034;ell&#034;) -&gt; true<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">trim()<\/td>\n<td align=\"left\">\u53bb\u9664\u9996\u5c3e\u7a7a\u683c<\/td>\n<td align=\"left\">&#034; ab &#034;.trim() -&gt; \u201cab\u201d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>4. \u91cd\u8981\u63d0\u9192<\/h4>\n<ul>\n<li>\u6bd4\u8f83\u5185\u5bb9&#xff1a;\u52a1\u5fc5\u4f7f\u7528 .equals()&#xff0c;\u4e0d\u8981\u4f7f\u7528 &#061;&#061;&#xff08;&#061;&#061; \u6bd4\u8f83\u7684\u662f\u5185\u5b58\u5730\u5740&#xff09;\u3002<\/li>\n<li>\u62fc\u63a5&#xff1a;&#043; \u53f7\u53ef\u7528\u4e8e\u62fc\u63a5&#xff0c;\u5176\u4ed6\u7c7b\u578b\u4f1a\u81ea\u52a8\u8f6c\u4e3a\u5b57\u7b26\u4e32\u3002\n<ul>\n<li>\u6ce8\u610f\u8fd0\u7b97\u987a\u5e8f&#xff1a;1 &#043; 2 &#043; &#034;abc&#034; -&gt; &#034;3abc&#034;&#xff1b;&#034;abc&#034; &#043; 1 &#043; 2 -&gt; &#034;abc12&#034;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 27 \u671f&#xff1a;Scanner \u7c7b\u5b9e\u73b0\u952e\u76d8\u5f55\u5165<\/h3>\n<h4>1. \u4f7f\u7528\u6b65\u9aa4<\/h4>\n<li>\u5bfc\u5305&#xff1a;import java.util.Scanner;<\/li>\n<li>\u521b\u5efa\u5bf9\u8c61&#xff1a;Scanner sc &#061; new Scanner(System.in);<\/li>\n<li>\u8c03\u7528\u65b9\u6cd5&#xff1a;\u6839\u636e\u6570\u636e\u7c7b\u578b\u9009\u62e9\u65b9\u6cd5\u3002<\/li>\n<h4>2. \u5e38\u7528\u8bfb\u53d6\u65b9\u6cd5<\/h4>\n<ul>\n<li>nextInt(): \u8bfb\u53d6\u6574\u6570\u3002<\/li>\n<li>nextDouble(): \u8bfb\u53d6\u5c0f\u6570\u3002<\/li>\n<li>nextBoolean(): \u8bfb\u53d6\u5e03\u5c14\u503c (true\/false)\u3002<\/li>\n<li>next(): \u8bfb\u53d6\u4e00\u4e2a\u5355\u8bcd&#xff08;\u9047\u5230\u7a7a\u683c\u505c\u6b62&#xff09;\u3002<\/li>\n<li>nextLine(): \u8bfb\u53d6\u4e00\u6574\u884c&#xff08;\u9047\u5230\u56de\u8f66\u505c\u6b62&#xff09;\u3002<\/li>\n<\/ul>\n<h4>3. \u5e38\u89c1\u5751&#xff1a;nextInt \u4e0e nextLine \u6df7\u7528<\/h4>\n<ul>\n<li>\u95ee\u9898&#xff1a;nextInt() \u53ea\u8bfb\u53d6\u6570\u5b57&#xff0c;\u4e0d\u8bfb\u53d6\u672b\u5c3e\u7684\u6362\u884c\u7b26 \\\\n\u3002\u7d27\u63a5\u7740\u8c03\u7528 nextLine() \u4f1a\u8bfb\u5230\u7a7a\u5b57\u7b26\u4e32\u3002<\/li>\n<li>\u89e3\u51b3\u65b9\u6848&#xff1a;\n<li>\u5728 nextInt() \u540e\u989d\u5916\u8c03\u7528\u4e00\u6b21 sc.nextLine() \u6d88\u8017\u6389\u6362\u884c\u7b26\u3002<\/li>\n<li>\u5168\u90e8\u4f7f\u7528 nextLine() \u8bfb\u53d6&#xff0c;\u518d\u901a\u8fc7 Integer.parseInt() \u8f6c\u6362\u3002<\/li>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 28 \u671f&#xff1a;Scanner \u7efc\u5408\u7ec3\u4e60<\/h3>\n<h4>\u6848\u4f8b 1&#xff1a;\u7528\u6237\u4fe1\u606f\u5f55\u5165<\/h4>\n<p>\u7ed3\u5408 nextLine, nextInt, nextDouble \u5f55\u5165\u59d3\u540d\u3001\u5e74\u9f84\u3001\u8eab\u9ad8\u3002<\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Scanner<\/span><\/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\">UserInfo<\/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\">Scanner<\/span> sc <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u59d3\u540d&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextLine<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u59d3\u540d\u53ef\u80fd\u542b\u7a7a\u683c&#xff0c;\u7528 nextLine<\/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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u5e74\u9f84&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u5e74\u9f84\u662f\u6574\u6570<\/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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u8eab\u9ad8&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">double<\/span> height <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8eab\u9ad8\u662f\u5c0f\u6570<\/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;\u4fe1\u606f&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;, &#034;<\/span> <span class=\"token operator\">&#043;<\/span> age <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u5c81, &#034;<\/span> <span class=\"token operator\">&#043;<\/span> height <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u7c73&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/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<h4>\u6848\u4f8b 2&#xff1a;\u7b80\u6613\u52a0\u6cd5\u8ba1\u7b97\u5668<\/h4>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Scanner<\/span><\/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\">SimpleCalculator<\/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\">Scanner<\/span> sc <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> num1 <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> num2 <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/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;\u7ed3\u679c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span>num1 <span class=\"token operator\">&#043;<\/span> num2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/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<hr \/>\n<h3>\u7b2c 29 \u671f&#xff1a;System.out.printf \u683c\u5f0f\u5316\u8f93\u51fa<\/h3>\n<h4>1. \u57fa\u672c\u8bed\u6cd5<\/h4>\n<p><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;\u683c\u5f0f\u5b57\u7b26\u4e32&#034;<\/span><span class=\"token punctuation\">,<\/span> \u53c2\u6570<span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> \u53c2\u6570<span class=\"token number\">2.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>2. \u5e38\u7528\u5360\u4f4d\u7b26<\/h4>\n<table>\n<tr>\u5360\u4f4d\u7b26\u7c7b\u578b\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">%d<\/td>\n<td align=\"left\">\u6574\u6570<\/td>\n<td align=\"left\">\u5341\u8fdb\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">%f<\/td>\n<td align=\"left\">\u6d6e\u70b9<\/td>\n<td align=\"left\">\u9ed8\u8ba4 6 \u4f4d\u5c0f\u6570<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">%s<\/td>\n<td align=\"left\">\u5b57\u7b26\u4e32<\/td>\n<td align=\"left\"><\/td>\n<\/tr>\n<tr>\n<td align=\"left\">%c<\/td>\n<td align=\"left\">\u5b57\u7b26<\/td>\n<td align=\"left\"><\/td>\n<\/tr>\n<tr>\n<td align=\"left\">%b<\/td>\n<td align=\"left\">\u5e03\u5c14<\/td>\n<td align=\"left\"><\/td>\n<\/tr>\n<tr>\n<td align=\"left\">%x<\/td>\n<td align=\"left\">\u6574\u6570<\/td>\n<td align=\"left\">\u5341\u516d\u8fdb\u5236<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">%n<\/td>\n<td align=\"left\">&#8211;<\/td>\n<td align=\"left\">\u6362\u884c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">%%<\/td>\n<td align=\"left\">&#8211;<\/td>\n<td align=\"left\">\u767e\u5206\u53f7\u672c\u8eab<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3. \u9ad8\u7ea7\u63a7\u5236<\/h4>\n<ul>\n<li>\u4fdd\u7559\u5c0f\u6570&#xff1a;%.2f (\u4fdd\u7559\u4e24\u4f4d&#xff0c;\u56db\u820d\u4e94\u5165)\u3002<\/li>\n<li>\u5bbd\u5ea6\u5bf9\u9f50&#xff1a;\n<ul>\n<li>%10d: \u53f3\u5bf9\u9f50&#xff0c;\u5bbd\u5ea6 10\u3002<\/li>\n<li>%-10d: \u5de6\u5bf9\u9f50&#xff0c;\u5bbd\u5ea6 10\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u8865\u96f6&#xff1a;%04d (\u4e0d\u8db3 4 \u4f4d\u524d\u9762\u8865 0&#xff0c;\u5982 0005)\u3002<\/li>\n<li>\u5343\u5206\u4f4d&#xff1a;%,d (\u5982 1,234,567)\u3002<\/li>\n<\/ul>\n<h4>4. \u5b57\u7b26\u4e32\u683c\u5f0f\u5316<\/h4>\n<p>String.format(&#034;\u683c\u5f0f&#034;, \u53c2\u6570) \u8fd4\u56de\u683c\u5f0f\u5316\u540e\u7684\u5b57\u7b26\u4e32&#xff0c;\u4e0d\u76f4\u63a5\u6253\u5370\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 30 \u671f&#xff1a;\u57fa\u7840\u8bed\u6cd5\u7efc\u5408\u7ec3\u4e60&#xff1a;\u7b80\u6613\u8ba1\u7b97\u5668<\/h3>\n<h4>\u9700\u6c42<\/h4>\n<p>\u5b9e\u73b0\u652f\u6301 &#043;, -, *, \/ \u7684\u8ba1\u7b97\u5668&#xff0c;\u8981\u6c42&#xff1a;<\/p>\n<li>\u63a5\u6536\u4e24\u4e2a\u64cd\u4f5c\u6570&#xff08;double&#xff09;\u3002<\/li>\n<li>\u63a5\u6536\u8fd0\u7b97\u7b26&#xff08;String&#xff09;\u3002<\/li>\n<li>\u8ba1\u7b97\u5e76\u8f93\u51fa\u7ed3\u679c&#xff08;\u4fdd\u7559\u4e24\u4f4d\u5c0f\u6570&#xff09;\u3002<\/li>\n<li>\u5904\u7406\u9664\u6570\u4e3a 0 \u548c\u65e0\u6548\u8fd0\u7b97\u7b26\u7684\u60c5\u51b5\u3002<\/li>\n<h4>\u5b8c\u6574\u4ee3\u7801<\/h4>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>util<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Scanner<\/span><\/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\">Calculator<\/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\">Scanner<\/span> sc <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Scanner<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>in<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;&#061;&#061;&#061; \u7b80\u6613\u8ba1\u7b97\u5668 &#061;&#061;&#061;&#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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u7b2c\u4e00\u4e2a\u6570&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">double<\/span> num1 <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextDouble<\/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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u8fd0\u7b97\u7b26 (&#043; &#8211; * \/)&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> op <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">next<\/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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8bf7\u8f93\u5165\u7b2c\u4e8c\u4e2a\u6570&#xff1a;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">double<\/span> num2 <span class=\"token operator\">&#061;<\/span> sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextDouble<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token keyword\">double<\/span> result <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">boolean<\/span> valid <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u5224\u65ad\u8fd0\u7b97\u7b26<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>op<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#043;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            result <span class=\"token operator\">&#061;<\/span> num1 <span class=\"token operator\">&#043;<\/span> num2<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>op<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/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            result <span class=\"token operator\">&#061;<\/span> num1 <span class=\"token operator\">&#8211;<\/span> num2<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>op<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/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            result <span class=\"token operator\">&#061;<\/span> num1 <span class=\"token operator\">*<\/span> num2<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>op<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>num2 <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;\u9519\u8bef&#xff1a;\u9664\u6570\u4e0d\u80fd\u4e3a 0&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n                valid <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                result <span class=\"token operator\">&#061;<\/span> num1 <span class=\"token operator\">\/<\/span> num2<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/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;\u9519\u8bef&#xff1a;\u65e0\u6548\u7684\u8fd0\u7b97\u7b26&#xff01;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            valid <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ \u8f93\u51fa\u7ed3\u679c<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>valid<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\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%.2f %s %.2f &#061; %.2f%n&#034;<\/span><span class=\"token punctuation\">,<\/span> num1<span class=\"token punctuation\">,<\/span> op<span class=\"token punctuation\">,<\/span> num2<span class=\"token punctuation\">,<\/span> result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p>        sc<span class=\"token punctuation\">.<\/span><span class=\"token function\">close<\/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<h4>\u77e5\u8bc6\u70b9\u56de\u987e<\/h4>\n<ul>\n<li>Scanner: \u6570\u636e\u8f93\u5165\u3002<\/li>\n<li>String: equals() \u6bd4\u8f83\u5b57\u7b26\u4e32\u3002<\/li>\n<li>Math: \u7b97\u672f\u8fd0\u7b97\u3002<\/li>\n<li>Control Flow: if-else \u5206\u652f\u5224\u65ad&#xff08;\u867d\u672c\u671f\u672a\u8be6\u7ec6\u8bb2\u8bed\u6cd5&#xff0c;\u4f46\u5df2\u5728\u4ee3\u7801\u4e2d\u4f7f\u7528&#xff09;\u3002<\/li>\n<li>Formatting: printf \u683c\u5f0f\u5316\u8f93\u51fa\u3002<\/li>\n<\/ul>\n<hr \/>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 31-40 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u6df1\u5165\u8bb2\u89e3 Java \u8fd0\u7b97\u7b26\u4f53\u7cfb&#xff0c;\u5305\u62ec\u7b97\u672f\u3001\u5b57\u7b26\u4e32\u62fc\u63a5\u3001\u81ea\u589e\u81ea\u51cf\u3001\u8d4b\u503c\u3001\u5173\u7cfb\u3001\u903b\u8f91&#xff08;\u542b\u77ed\u8def&#xff09;\u3001\u4f4d\u8fd0\u7b97\u3001\u4f4d\u79fb\u4ee5\u53ca\u4e09\u5143\u8fd0\u7b97\u7b26\u3002\u91cd\u70b9\u89e3\u6790\u6613\u9519\u70b9\u548c\u9762\u8bd5\u8003\u70b9\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 31 \u671f&#xff1a;\u7b97\u672f\u8fd0\u7b97\u7b26 (&#043;, -, *, \/, %)<\/h3>\n<h4>1. \u57fa\u672c\u7b97\u672f\u8fd0\u7b97\u7b26<\/h4>\n<table>\n<tr>\u8fd0\u7b97\u7b26\u542b\u4e49\u793a\u4f8b\u7ed3\u679c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">&#043;<\/td>\n<td align=\"left\">\u52a0\u6cd5<\/td>\n<td align=\"left\">5 &#043; 3<\/td>\n<td align=\"left\">8<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">&#8211;<\/td>\n<td align=\"left\">\u51cf\u6cd5<\/td>\n<td align=\"left\">5 &#8211; 3<\/td>\n<td align=\"left\">2<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">*<\/td>\n<td align=\"left\">\u4e58\u6cd5<\/td>\n<td align=\"left\">5 * 3<\/td>\n<td align=\"left\">15<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\/<\/td>\n<td align=\"left\">\u9664\u6cd5<\/td>\n<td align=\"left\">5 \/ 3<\/td>\n<td align=\"left\">1 (\u6574\u6570\u622a\u65ad)<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">%<\/td>\n<td align=\"left\">\u53d6\u6a21(\u4f59\u6570)<\/td>\n<td align=\"left\">5 % 3<\/td>\n<td align=\"left\">2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2. \u6574\u6570\u9664\u6cd5\u9677\u9631<\/h4>\n<ul>\n<li>\u89c4\u5219&#xff1a;\u4e24\u4e2a\u6574\u6570\u76f8\u9664&#xff0c;\u7ed3\u679c\u4ecd\u4e3a\u6574\u6570&#xff0c;\u76f4\u63a5\u622a\u65ad\u5c0f\u6570\u90e8\u5206&#xff08;\u975e\u56db\u820d\u4e94\u5165&#xff09;\u3002<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 number\">5<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa 1<\/span>\n<\/li>\n<li>\u83b7\u53d6\u5c0f\u6570\u7ed3\u679c&#xff1a;\u786e\u4fdd\u81f3\u5c11\u6709\u4e00\u4e2a\u64cd\u4f5c\u6570\u662f\u6d6e\u70b9\u6570\u3002<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 number\">5.0<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>   <span class=\"token comment\">\/\/ 1.666&#8230;<\/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 keyword\">double<\/span><span class=\"token punctuation\">)<\/span><span class=\"token number\">5<\/span> <span class=\"token operator\">\/<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 1.666&#8230;<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>3. \u53d6\u6a21\u8fd0\u7b97 (%) \u7684\u5e94\u7528<\/h4>\n<ul>\n<li>\u5224\u65ad\u5947\u5076&#xff1a;num % 2 &#061;&#061; 0 \u4e3a\u5076\u6570\u3002<\/li>\n<li>\u83b7\u53d6\u4f4e\u4f4d&#xff1a;num % 10 \u83b7\u53d6\u4e2a\u4f4d\u6570\u3002<\/li>\n<li>\u8303\u56f4\u63a7\u5236&#xff1a;\u751f\u6210\u968f\u673a\u6570\u65f6\u5e38\u7528 random() % n\u3002<\/li>\n<\/ul>\n<h4>4. \u5176\u4ed6\u7279\u6027<\/h4>\n<ul>\n<li>\u6b63\u8d1f\u53f7&#xff1a;&#043;5, -3 \u4e3a\u4e00\u5143\u8fd0\u7b97\u7b26\u3002<\/li>\n<li>\u5b57\u7b26\u8fd0\u7b97&#xff1a;char \u53c2\u4e0e\u8fd0\u7b97\u65f6\u81ea\u52a8\u8f6c\u4e3a ASCII\/Unicode \u7801\u503c\u3002<span class=\"token keyword\">char<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token char\">&#039;a&#039;<\/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>c <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 comment\">\/\/ 98 (&#039;b&#039;\u7684\u7f16\u7801)<\/span><\/p>\n<\/li>\n<li>\u5b57\u7b26\u4e32\u62fc\u63a5&#xff1a;&#043; \u53f7\u82e5\u6709\u4e00\u8fb9\u662f\u5b57\u7b26\u4e32&#xff0c;\u5219\u6267\u884c\u62fc\u63a5\u800c\u975e\u52a0\u6cd5\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 32 \u671f&#xff1a;\u5b57\u7b26\u4e32\u62fc\u63a5\u4e0e &#043; \u53f7\u91cd\u8f7d<\/h3>\n<h4>1. \u8fd0\u7b97\u7b26\u91cd\u8f7d<\/h4>\n<p>Java \u4e2d\u53ea\u6709 &#043; \u53f7\u652f\u6301\u91cd\u8f7d&#xff1a;<\/p>\n<ul>\n<li>\u4e24\u8fb9\u90fd\u662f\u6570\u5b57 \u2192 \u52a0\u6cd5\u3002<\/li>\n<li>\u6709\u4e00\u8fb9\u662f\u5b57\u7b26\u4e32 \u2192 \u62fc\u63a5\u3002<\/li>\n<\/ul>\n<h4>2. \u62fc\u63a5\u987a\u5e8f\u4e0e\u62ec\u53f7<\/h4>\n<p>&#043; \u53f7\u4ece\u5de6\u5f80\u53f3\u8ba1\u7b97&#xff0c;\u7c7b\u578b\u51b3\u5b9a\u884c\u4e3a\u3002<\/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 number\">1<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;abc&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ &#034;3abc&#034; (\u5148\u7b97 1&#043;2&#061;3&#xff0c;\u518d\u62fc)<\/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;abc&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ &#034;abc12&#034; (\u5148\u62fc &#034;abc&#034;&#043;1&#061;&#034;abc1&#034;&#xff0c;\u518d\u62fc)<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u4f7f\u7528\u62ec\u53f7\u6539\u53d8\u4f18\u5148\u7ea7<\/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;\u7ed3\u679c&#xff1a;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ &#034;\u7ed3\u679c&#xff1a;3&#034;<\/span><\/p>\n<h4>3. \u5e95\u5c42\u539f\u7406<\/h4>\n<ul>\n<li>\u5e38\u91cf\u62fc\u63a5&#xff1a;\u7f16\u8bd1\u5668\u4f18\u5316\u4e3a\u76f4\u63a5\u62fc\u63a5 &#034;HelloWorld&#034;\u3002<\/li>\n<li>\u53d8\u91cf\u62fc\u63a5&#xff1a;\u5e95\u5c42\u4f7f\u7528 StringBuilder.append()\u3002\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u5728\u5faa\u73af\u4e2d\u5927\u91cf\u4f7f\u7528 &#043; \u62fc\u63a5\u5b57\u7b26\u4e32\u4f1a\u9891\u7e41\u521b\u5efa\u5bf9\u8c61&#xff0c;\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u5efa\u8bae\u6539\u7528 StringBuilder\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>4. \u7279\u6b8a\u503c\u5904\u7406<\/h4>\n<ul>\n<li>\u7a7a\u5b57\u7b26\u4e32 &#034;&#034;&#xff1a;\u62fc\u63a5\u540e\u65e0\u53d8\u5316\u3002<\/li>\n<li>null&#xff1a;\u62fc\u63a5\u65f6\u4f1a\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32 &#034;null&#034;&#xff0c;\u4e0d\u4f1a\u62a5\u7a7a\u6307\u9488\u5f02\u5e38\u3002<span class=\"token class-name\">String<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/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 operator\">&#043;<\/span> <span class=\"token string\">&#034;abc&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa &#034;nullabc&#034;<\/span><\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 33 \u671f&#xff1a;\u81ea\u589e\u81ea\u51cf\u8fd0\u7b97\u7b26 (&#043;&#043; \/ &#8211;)<\/h3>\n<h4>1. \u524d\u7f00\u5f0f vs \u540e\u7f00\u5f0f<\/h4>\n<ul>\n<li>\u524d\u7f00\u5f0f (&#043;&#043;a, &#8211;a)&#xff1a;\u5148\u53d8\u540e\u7528\u3002\u5148\u8ba9\u53d8\u91cf\u52a0\u51cf 1&#xff0c;\u518d\u4f7f\u7528\u65b0\u503c\u3002<\/li>\n<li>\u540e\u7f00\u5f0f (a&#043;&#043;, a&#8211;)&#xff1a;\u5148\u7528\u540e\u53d8\u3002\u5148\u4f7f\u7528\u539f\u503c&#xff0c;\u518d\u8ba9\u53d8\u91cf\u52a0\u51cf 1\u3002<\/li>\n<\/ul>\n<h4>2. \u793a\u4f8b\u5bf9\u6bd4<\/h4>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> a<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ b&#061;10, a&#061;11 (\u540e\u7f00&#xff1a;\u5148\u752810\u8d4b\u503c\u7ed9b&#xff0c;a\u518d\u53d811)<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> c <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> d <span class=\"token operator\">&#061;<\/span> <span class=\"token operator\">&#043;&#043;<\/span>c<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ d&#061;11, c&#061;11 (\u524d\u7f00&#xff1a;c\u5148\u53d811&#xff0c;\u518d\u752811\u8d4b\u503c\u7ed9d)<\/span><\/p>\n<h4>3. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u5355\u72ec\u4f7f\u7528\u65e0\u533a\u522b&#xff1a;a&#043;&#043;; \u548c &#043;&#043;a; \u6548\u679c\u76f8\u540c\u3002<\/li>\n<li>\u4ec5\u4f5c\u7528\u4e8e\u53d8\u91cf&#xff1a;5&#043;&#043; \u6216 (a&#043;b)&#043;&#043; \u975e\u6cd5\u3002<\/li>\n<li>\u9762\u8bd5\u9898\u9677\u9631&#xff1a;<span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> a<span class=\"token operator\">&#043;&#043;<\/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>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8f93\u51fa 10<\/span><br \/>\n<span class=\"token comment\">\/\/ \u89e3\u6790&#xff1a;\u540e\u7f00\u5f0f\u5148\u7528\u539f\u503c10&#xff0c;a\u53d8\u4e3a11&#xff0c;\u6700\u540e\u628a\u539f\u503c10\u8d4b\u56de\u7ed9a&#xff0c;\u6240\u4ee5a\u8fd8\u662f10\u3002<\/span><\/p>\n<\/li>\n<li>\u5f00\u53d1\u5efa\u8bae&#xff1a;\u907f\u514d\u5728\u590d\u6742\u8868\u8fbe\u5f0f\u4e2d\u6df7\u7528\u81ea\u589e\u81ea\u51cf&#xff0c;\u4fdd\u6301\u4ee3\u7801\u53ef\u8bfb\u6027\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 34 \u671f&#xff1a;\u8d4b\u503c\u4e0e\u6269\u5c55\u8d4b\u503c\u8fd0\u7b97\u7b26<\/h3>\n<h4>1. \u57fa\u672c\u8d4b\u503c<\/h4>\n<p>&#061; &#xff1a;\u5c06\u53f3\u4fa7\u503c\u8d4b\u7ed9\u5de6\u4fa7\u53d8\u91cf\u3002\u5de6\u4fa7\u5fc5\u987b\u662f\u53d8\u91cf\u3002<\/p>\n<h4>2. \u6269\u5c55\u8d4b\u503c\u8fd0\u7b97\u7b26<\/h4>\n<p>\u5305\u62ec &#043;&#061;, -&#061;, *&#061;, \/&#061;, %&#061; \u7b49\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\na <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8e a &#061; a &#043; 5;<\/span><\/p>\n<h4>3. \u9690\u85cf\u7684\u7c7b\u578b\u8f6c\u6362 (\u91cd\u8981!)<\/h4>\n<p>\u6269\u5c55\u8d4b\u503c\u8fd0\u7b97\u7b26\u4f1a\u81ea\u52a8\u8fdb\u884c\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u3002<\/p>\n<p><span class=\"token keyword\">byte<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ b &#061; b &#043; 1; \/\/ \u62a5\u9519&#xff01;b&#043;1\u7ed3\u679c\u662fint&#xff0c;\u4e0d\u80fd\u76f4\u63a5\u8d4b\u7ed9byte<\/span><br \/>\nb <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span>      <span class=\"token comment\">\/\/ \u6b63\u786e&#xff01;\u7b49\u4ef7\u4e8e b &#061; (byte)(b &#043; 1)<\/span><\/p>\n<ul>\n<li>\u98ce\u9669&#xff1a;\u5982\u679c\u7ed3\u679c\u8d85\u51fa\u76ee\u6807\u7c7b\u578b\u8303\u56f4&#xff0c;\u4f1a\u53d1\u751f\u6ea2\u51fa&#xff0c;\u4f46\u7f16\u8bd1\u5668\u4e0d\u4f1a\u62a5\u9519\u3002<span class=\"token keyword\">byte<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">127<\/span><span class=\"token punctuation\">;<\/span><br \/>\nb <span class=\"token operator\">&#043;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7ed3\u679c\u4e3a -128 (\u6ea2\u51fa)<\/span><\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 35 \u671f&#xff1a;\u5173\u7cfb\u8fd0\u7b97\u7b26<\/h3>\n<h4>1. \u5e38\u7528\u7b26\u53f7<\/h4>\n<p>&#061;&#061; (\u7b49\u4e8e), !&#061; (\u4e0d\u7b49\u4e8e), &gt; (\u5927\u4e8e), &lt; (\u5c0f\u4e8e), &gt;&#061; (\u5927\u4e8e\u7b49\u4e8e), &lt;&#061; (\u5c0f\u4e8e\u7b49\u4e8e)\u3002<\/p>\n<ul>\n<li>\u7ed3\u679c&#xff1a;\u5747\u4e3a boolean \u7c7b\u578b\u3002<\/li>\n<\/ul>\n<h4>2. \u5e38\u89c1\u9519\u8bef&#xff1a;&#061; vs &#061;&#061;<\/h4>\n<ul>\n<li>&#061; \u662f\u8d4b\u503c\u3002<\/li>\n<li>&#061;&#061; \u662f\u6bd4\u8f83\u3002<\/li>\n<li>\u9690\u853d Bug&#xff1a;<span class=\"token keyword\">boolean<\/span> flag <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>flag <span class=\"token operator\">&#061;<\/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 punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> <span class=\"token punctuation\">}<\/span> <span class=\"token comment\">\/\/ \u8fd9\u662f\u8d4b\u503c&#xff0c;\u6c38\u8fdc\u6210\u7acb&#xff01;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u5efa\u8bae\u5199\u6cd5&#xff1a;if (true &#061;&#061; flag) { &#8230; } \/\/ \u5199\u53cd\u4e86\u7f16\u8bd1\u62a5\u9519&#xff0c;\u4fbf\u4e8e\u53d1\u73b0<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>3. \u5b57\u7b26\u4e32\u6bd4\u8f83<\/h4>\n<ul>\n<li>\u4e25\u7981\u4f7f\u7528 &#061;&#061; \u6bd4\u8f83\u5185\u5bb9&#xff1a;&#061;&#061; \u6bd4\u8f83\u7684\u662f\u5185\u5b58\u5730\u5740\u3002<\/li>\n<li>\u5fc5\u987b\u4f7f\u7528 .equals()&#xff1a;<span class=\"token class-name\">String<\/span> s1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/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 class-name\">String<\/span> s2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">String<\/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 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>s1 <span class=\"token operator\">&#061;&#061;<\/span> s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ false (\u5730\u5740\u4e0d\u540c)<\/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>s1<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>s2<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>  <span class=\"token comment\">\/\/ true (\u5185\u5bb9\u76f8\u540c)<\/span><\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 36 \u671f&#xff1a;\u903b\u8f91\u8fd0\u7b97\u7b26 (&amp;, |, ^, !)<\/h3>\n<h4>1. \u57fa\u7840\u903b\u8f91\u8fd0\u7b97<\/h4>\n<table>\n<tr>\u8fd0\u7b97\u7b26\u540d\u79f0\u89c4\u5219\u53e3\u8bc0<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">&amp;<\/td>\n<td align=\"left\">\u4e0e<\/td>\n<td align=\"left\">\u5168\u771f\u624d\u771f<\/td>\n<td align=\"left\">\u6709\u5047\u5219\u5047<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">&#096;<\/td>\n<td align=\"left\">&#096;<\/td>\n<td align=\"left\">\u6216<\/td>\n<td align=\"left\">\u6709\u771f\u5219\u771f<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">^<\/td>\n<td align=\"left\">\u5f02\u6216<\/td>\n<td align=\"left\">\u4e0d\u540c\u4e3a\u771f<\/td>\n<td align=\"left\">\u540c\u5047\u5f02\u771f<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">!<\/td>\n<td align=\"left\">\u975e<\/td>\n<td align=\"left\">\u53d6\u53cd<\/td>\n<td align=\"left\">\u771f\u5047\u4e92\u6362<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2. \u4f18\u5148\u7ea7<\/h4>\n<p>! &gt; &amp; &gt; ^ &gt; |<\/p>\n<h4>3. \u53cc\u91cd\u8eab\u4efd<\/h4>\n<p>&amp; \u548c | \u65e2\u53ef\u7528\u4e8e\u903b\u8f91\u8fd0\u7b97&#xff08;\u64cd\u4f5c\u6570\u4e3a boolean&#xff09;&#xff0c;\u4e5f\u53ef\u7528\u4e8e\u4f4d\u8fd0\u7b97&#xff08;\u64cd\u4f5c\u6570\u4e3a\u6574\u6570&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 37 \u671f&#xff1a;\u77ed\u8def\u903b\u8f91\u8fd0\u7b97\u7b26 (&amp;&amp;, ||)<\/h3>\n<h4>1. \u77ed\u8def\u673a\u5236<\/h4>\n<ul>\n<li>&amp;&amp; (\u77ed\u8def\u4e0e)&#xff1a;\u82e5\u5de6\u8fb9\u4e3a false&#xff0c;\u53f3\u8fb9\u4e0d\u6267\u884c&#xff0c;\u76f4\u63a5\u8fd4\u56de false\u3002<\/li>\n<li>|| (\u77ed\u8def\u6216)&#xff1a;\u82e5\u5de6\u8fb9\u4e3a true&#xff0c;\u53f3\u8fb9\u4e0d\u6267\u884c&#xff0c;\u76f4\u63a5\u8fd4\u56de true\u3002<\/li>\n<li>\u5bf9\u6bd4 &amp; \u548c |&#xff1a;\u65e0\u8bba\u5de6\u8fb9\u7ed3\u679c\u5982\u4f55&#xff0c;\u53f3\u8fb9\u4e00\u5b9a\u6267\u884c\u3002<\/li>\n<\/ul>\n<h4>2. \u4e3a\u4ec0\u4e48\u7528\u77ed\u8def&#xff1f;<\/h4>\n<li>\u6548\u7387&#xff1a;\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8ba1\u7b97\u3002<\/li>\n<li>\u5b89\u5168 (\u9632 NPE)&#xff1a;\u5e38\u7528\u4e8e\u5224\u7a7a\u3002<span class=\"token class-name\">String<\/span> s <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ if (s !&#061; null &amp;&amp; s.length() &gt; 0) \/\/ \u5b89\u5168&#xff1a;s!&#061;null\u4e3afalse&#xff0c;\u8df3\u8fc7length()\u8c03\u7528<\/span><br \/>\n<span class=\"token comment\">\/\/ if (s !&#061; null &amp; s.length() &gt; 0)  \/\/ \u5371\u9669&#xff1a;\u53f3\u8fb9\u4ecd\u6267\u884c&#xff0c;\u629b\u51fa NullPointerException<\/span><\/p>\n<\/li>\n<h4>3. \u5f00\u53d1\u89c4\u8303<\/h4>\n<p>\u5b9e\u9645\u4e1a\u52a1\u5f00\u53d1\u4e2d&#xff0c;\u903b\u8f91\u5224\u65ad\u51e0\u4e4e\u5168\u90e8\u4f7f\u7528 &amp;&amp; \u548c ||\u3002&amp; \u548c | \u4e3b\u8981\u7528\u4e8e\u4f4d\u8fd0\u7b97\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 38 \u671f&#xff1a;\u4f4d\u8fd0\u7b97\u7b26\u57fa\u7840 (&amp;, |, ^, ~)<\/h3>\n<h4>1. \u6309\u4f4d\u4e0e &amp;<\/h4>\n<ul>\n<li>\u89c4\u5219&#xff1a;\u5bf9\u5e94\u4f4d\u90fd\u4e3a 1 \u5219\u4e3a 1\u3002<\/li>\n<li>\u5e94\u7528&#xff1a;\u5224\u65ad\u5947\u5076 (num &amp; 1)\u3001\u6e05\u96f6\u3001\u63d0\u53d6\u6307\u5b9a\u4f4d\u3002<\/li>\n<\/ul>\n<h4>2. \u6309\u4f4d\u6216 |<\/h4>\n<ul>\n<li>\u89c4\u5219&#xff1a;\u5bf9\u5e94\u4f4d\u6709\u4e00\u4e2a\u4e3a 1 \u5219\u4e3a 1\u3002<\/li>\n<li>\u5e94\u7528&#xff1a;\u8bbe\u7f6e\u7279\u5b9a\u4f4d\u4e3a 1\u3002<\/li>\n<\/ul>\n<h4>3. \u6309\u4f4d\u5f02\u6216 ^<\/h4>\n<ul>\n<li>\u89c4\u5219&#xff1a;\u5bf9\u5e94\u4f4d\u4e0d\u540c\u5219\u4e3a 1\u3002<\/li>\n<li>\u7279\u6027&#xff1a;\n<ul>\n<li>a ^ a &#061; 0<\/li>\n<li>a ^ 0 &#061; a<\/li>\n<li>\u6ee1\u8db3\u4ea4\u6362\u5f8b\u548c\u7ed3\u5408\u5f8b\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u7ecf\u5178\u5e94\u7528&#xff1a;\u65e0\u9700\u4e34\u65f6\u53d8\u91cf\u4ea4\u6362\u4e24\u4e2a\u6574\u6570\u3002a <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">^<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\nb <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">^<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\na <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">^<\/span> b<span class=\"token punctuation\">;<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>4. \u6309\u4f4d\u53d6\u53cd ~<\/h4>\n<ul>\n<li>\u89c4\u5219&#xff1a;0 \u53d8 1&#xff0c;1 \u53d8 0\u3002<\/li>\n<li>\u6ce8\u610f&#xff1a;\u6d89\u53ca\u8865\u7801&#xff0c;~x \u901a\u5e38\u7b49\u4e8e -x &#8211; 1\u3002<\/li>\n<\/ul>\n<h4>5. \u9002\u7528\u8303\u56f4<\/h4>\n<p>\u4ec5\u9002\u7528\u4e8e\u6574\u6570\u7c7b\u578b (byte, short, int, long, char)\u3002\u8fd0\u7b97\u65f6\u5c0f\u7c7b\u578b\u81ea\u52a8\u63d0\u5347\u4e3a int\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 39 \u671f&#xff1a;\u4f4d\u79fb\u8fd0\u7b97\u7b26 (&lt;&lt;, &gt;&gt;, &gt;&gt;&gt;)<\/h3>\n<h4>1. \u5de6\u79fb &lt;&lt;<\/h4>\n<ul>\n<li>\u89c4\u5219&#xff1a;\u4f4e\u4f4d\u8865 0&#xff0c;\u9ad8\u4f4d\u6ea2\u51fa\u4e22\u5f03\u3002<\/li>\n<li>\u610f\u4e49&#xff1a;x &lt;&lt; n \u7b49\u4ef7\u4e8e x * 2^n\u3002<\/li>\n<li>\u98ce\u9669&#xff1a;\u5bb9\u6613\u6ea2\u51fa&#xff08;\u7279\u522b\u662f\u7b26\u53f7\u4f4d\u79fb\u5165\u6570\u636e\u4f4d&#xff09;\u3002<\/li>\n<\/ul>\n<h4>2. \u6709\u7b26\u53f7\u53f3\u79fb &gt;&gt;<\/h4>\n<ul>\n<li>\u89c4\u5219&#xff1a;\u9ad8\u4f4d\u8865\u7b26\u53f7\u4f4d&#xff08;\u6b63\u6570\u8865 0&#xff0c;\u8d1f\u6570\u8865 1&#xff09;\u3002<\/li>\n<li>\u610f\u4e49&#xff1a;x &gt;&gt; n \u7b49\u4ef7\u4e8e x \/ 2^n (\u5411\u4e0b\u53d6\u6574)\u3002<\/li>\n<li>\u6ce8\u610f&#xff1a;\u8d1f\u6570\u53f3\u79fb\u7ed3\u679c\u4e0e\u6574\u6570\u9664\u6cd5\u7565\u6709\u4e0d\u540c&#xff08;\u5982 -5 &gt;&gt; 1 \u4e3a -3&#xff0c;\u800c -5 \/ 2 \u4e3a -2&#xff09;\u3002<\/li>\n<\/ul>\n<h4>3. \u65e0\u7b26\u53f7\u53f3\u79fb &gt;&gt;&gt;<\/h4>\n<ul>\n<li>\u89c4\u5219&#xff1a;\u9ad8\u4f4d\u6052\u8865 0\u3002<\/li>\n<li>\u610f\u4e49&#xff1a;\u8d1f\u6570\u65e0\u7b26\u53f7\u53f3\u79fb\u4f1a\u53d8\u6210\u5f88\u5927\u7684\u6b63\u6570\u3002\u5e38\u7528\u4e8e\u5904\u7406\u65e0\u7b26\u53f7\u6570\u636e&#xff08;\u5982 IP \u5730\u5740&#xff09;\u3002<\/li>\n<\/ul>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u4f4d\u79fb\u91cf\u8d85\u8fc7\u7c7b\u578b\u4f4d\u6570\u65f6&#xff0c;\u4f1a\u5bf9\u4f4d\u6570\u53d6\u6a21&#xff08;\u5982 int \u79fb 32 \u4f4d\u76f8\u5f53\u4e8e\u79fb 0 \u4f4d&#xff09;\u3002<\/li>\n<li>\u5b9e\u9645\u4e1a\u52a1\u4e2d\u8f83\u5c11\u4f7f\u7528&#xff0c;\u591a\u89c1\u4e8e\u7b97\u6cd5\u548c\u5e95\u5c42\u4f18\u5316\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 40 \u671f&#xff1a;\u4e09\u5143\u8fd0\u7b97\u7b26 (? &#x1f603;<\/h3>\n<h4>1. \u8bed\u6cd5\u7ed3\u6784<\/h4>\n<p>\u6761\u4ef6\u8868\u8fbe\u5f0f <span class=\"token operator\">?<\/span> \u8868\u8fbe\u5f0f<span class=\"token number\">1<\/span> <span class=\"token operator\">:<\/span> \u8868\u8fbe\u5f0f<span class=\"token number\">2<\/span><\/p>\n<ul>\n<li>\u6761\u4ef6\u4e3a true \u2192 \u7ed3\u679c\u4e3a\u8868\u8fbe\u5f0f 1 \u7684\u503c\u3002<\/li>\n<li>\u6761\u4ef6\u4e3a false \u2192 \u7ed3\u679c\u4e3a\u8868\u8fbe\u5f0f 2 \u7684\u503c\u3002<\/li>\n<\/ul>\n<h4>2. \u7279\u70b9<\/h4>\n<ul>\n<li>\u8868\u8fbe\u5f0f\u800c\u975e\u8bed\u53e5&#xff1a;\u5fc5\u987b\u6709\u8fd4\u56de\u503c&#xff0c;\u4e14\u8be5\u8fd4\u56de\u503c\u5fc5\u987b\u88ab\u4f7f\u7528&#xff08;\u8d4b\u503c\u6216\u6253\u5370&#xff09;\u3002<span class=\"token comment\">\/\/ int a &#061; 10;<\/span><br \/>\n<span class=\"token comment\">\/\/ a &gt; 5 ? a&#043;&#043; : b&#043;&#043;; \/\/ \u62a5\u9519&#xff01;\u7ed3\u679c\u672a\u4f7f\u7528<\/span><\/p>\n<\/li>\n<li>\u7c7b\u578b\u4e00\u81f4\u6027&#xff1a;\u8868\u8fbe\u5f0f 1 \u548c 2 \u7684\u7c7b\u578b\u5e94\u4e00\u81f4&#xff0c;\u5426\u5219\u4f1a\u81ea\u52a8\u7c7b\u578b\u63d0\u5347\u3002<\/li>\n<\/ul>\n<h4>3. \u9002\u7528\u573a\u666f<\/h4>\n<ul>\n<li>\u7b80\u5355\u4e8c\u9009\u4e00\u53d6\u503c\u3002<\/li>\n<li>\u66ff\u4ee3\u7b80\u5355\u7684 if-else\u3002<span class=\"token class-name\">String<\/span> status <span class=\"token operator\">&#061;<\/span> age <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">18<\/span> <span class=\"token operator\">?<\/span> <span class=\"token string\">&#034;\u6210\u5e74&#034;<\/span> <span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;\u672a\u6210\u5e74&#034;<\/span><span class=\"token punctuation\">;<\/span>\n<\/li>\n<li>\u4e0d\u5efa\u8bae&#xff1a;\u5d4c\u5957\u8fc7\u6df1\u6216\u903b\u8f91\u590d\u6742\u65f6\u4f7f\u7528&#xff0c;\u4f1a\u964d\u4f4e\u53ef\u8bfb\u6027&#xff0c;\u6b64\u65f6\u5e94\u4f7f\u7528 if-else\u3002<\/li>\n<\/ul>\n<hr \/>\n<p>\u7ed3\u8bed&#xff1a;\u606d\u559c&#xff01;\u4f60\u5df2\u7ecf\u638c\u63e1\u4e86 Java \u4e2d\u6240\u6709\u7684\u57fa\u7840\u8fd0\u7b97\u7b26\u3002\u4ece\u7b97\u672f\u8fd0\u7b97\u5230\u4f4d\u8fd0\u7b97&#xff0c;\u518d\u5230\u903b\u8f91\u63a7\u5236\u548c\u6761\u4ef6\u9009\u62e9&#xff0c;\u8fd9\u4e9b\u8fd0\u7b97\u7b26\u6784\u6210\u4e86 Java \u7a0b\u5e8f\u903b\u8f91\u7684\u57fa\u77f3\u3002\u4e0b\u4e00\u671f\u6211\u4eec\u5c06\u8fdb\u5165\u6d41\u7a0b\u63a7\u5236\u7684\u6838\u5fc3\u2014\u2014\u5206\u652f\u7ed3\u6784 (if-else, switch)\u3002<\/p>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 41-50 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u6df1\u5165\u8bb2\u89e3\u8fd0\u7b97\u7b26\u7684\u9ad8\u7ea7\u7528\u6cd5&#xff08;\u5d4c\u5957\u3001\u4f18\u5148\u7ea7\u3001\u6c42\u503c\u987a\u5e8f&#xff09;\u3001Java 10&#043; \u65b0\u7279\u6027 var&#xff0c;\u5e76\u6b63\u5f0f\u8fdb\u5165\u6d41\u7a0b\u63a7\u5236\u7684\u6838\u5fc3\u2014\u2014\u9009\u62e9\u7ed3\u6784&#xff08;if \u8bed\u53e5\u7684\u4e09\u79cd\u683c\u5f0f\u3001\u5d4c\u5957\u3001switch \u8bed\u53e5&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 41 \u671f&#xff1a;\u4e09\u5143\u8fd0\u7b97\u7b26\u7684\u5d4c\u5957\u4f7f\u7528<\/h3>\n<h4>1. \u4ec0\u4e48\u662f\u5d4c\u5957<\/h4>\n<p>\u4e09\u5143\u8fd0\u7b97\u7b26\u7684\u8868\u8fbe\u5f0f\u90e8\u5206\u53ef\u4ee5\u518d\u6b21\u5305\u542b\u4e09\u5143\u8fd0\u7b97\u7b26&#xff0c;\u5f62\u6210\u5d4c\u5957\u7ed3\u6784\u3002<\/p>\n<ul>\n<li>\u8bed\u6cd5&#xff1a;\u6761\u4ef6 ? \u8868\u8fbe\u5f0f1 : (\u6761\u4ef62 ? \u8868\u8fbe\u5f0f2 : \u8868\u8fbe\u5f0f3)<\/li>\n<li>\u793a\u4f8b&#xff1a;\u5224\u65ad\u6b63\u6570\u3001\u8d1f\u6570\u6216\u96f6\u3002<span class=\"token class-name\">String<\/span> result <span class=\"token operator\">&#061;<\/span> num <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token string\">&#034;\u6b63\u6570&#034;<\/span> <span class=\"token operator\">:<\/span> <span class=\"token punctuation\">(<\/span>num <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">?<\/span> <span class=\"token string\">&#034;\u8d1f\u6570&#034;<\/span> <span class=\"token operator\">:<\/span> <span class=\"token string\">&#034;\u96f6&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<\/li>\n<\/ul>\n<h4>2. \u7ecf\u5178\u6848\u4f8b&#xff1a;\u4e09\u4e2a\u6570\u6c42\u6700\u5927\u503c<\/h4>\n<p><span class=\"token keyword\">int<\/span> max <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">&gt;<\/span> b <span class=\"token operator\">?<\/span> <span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&gt;<\/span> c <span class=\"token operator\">?<\/span> a <span class=\"token operator\">:<\/span> c<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">:<\/span> <span class=\"token punctuation\">(<\/span>b <span class=\"token operator\">&gt;<\/span> c <span class=\"token operator\">?<\/span> b <span class=\"token operator\">:<\/span> c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ \u903b\u8f91&#xff1a;\u5148\u6bd4 a \u548c b&#xff0c;\u80dc\u8005\u518d\u4e0e c \u6bd4\u8f83<\/span><\/p>\n<h4>3. \u7ed3\u5408\u6027\u4e0e\u53ef\u8bfb\u6027<\/h4>\n<ul>\n<li>\u53f3\u7ed3\u5408\u6027&#xff1a;a &gt; b ? a : b &gt; c ? b : c \u7b49\u4ef7\u4e8e a &gt; b ? a : (b &gt; c ? b : c)\u3002<\/li>\n<li>\u5efa\u8bae&#xff1a;\u867d\u7136\u652f\u6301\u5d4c\u5957&#xff0c;\u4f46\u8d85\u8fc7\u4e00\u5c42\u5d4c\u5957\u540e\u53ef\u8bfb\u6027\u6025\u5267\u4e0b\u964d\u3002\u5f3a\u70c8\u5efa\u8bae\u4f7f\u7528\u62ec\u53f7\u660e\u786e\u610f\u56fe&#xff0c;\u6216\u8005\u76f4\u63a5\u4f7f\u7528 if-else if-else \u7ed3\u6784\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 42 \u671f&#xff1a;\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u4e0e\u7ed3\u5408\u6027<\/h3>\n<h4>1. \u4f18\u5148\u7ea7 (Precedence)<\/h4>\n<p>\u51b3\u5b9a\u4e0d\u540c\u8fd0\u7b97\u7b26\u8c01\u5148\u8ba1\u7b97\u3002<\/p>\n<ul>\n<li>\u6700\u9ad8&#xff1a;. (\u6210\u5458\u8bbf\u95ee), [] (\u6570\u7ec4), () (\u62ec\u53f7\/\u65b9\u6cd5\u8c03\u7528)\u3002<\/li>\n<li>\u9ad8&#xff1a;\u4e00\u5143\u8fd0\u7b97\u7b26 (!, ~, &#043;&#043;, &#8211;, &#043;, -)\u3002<\/li>\n<li>\u4e2d&#xff1a;\u7b97\u672f (*, \/, %) \u2192 \u4f4d\u79fb (&lt;&lt;, &gt;&gt;) \u2192 \u5173\u7cfb (&lt;, &gt;) \u2192 \u76f8\u7b49 (&#061;&#061;, !&#061;) \u2192 \u4f4d\u4e0e (&amp;) \u2192 \u4f4d\u5f02\u6216 (^) \u2192 \u4f4d\u6216 (|) \u2192 \u903b\u8f91\u4e0e (&amp;&amp;) \u2192 \u903b\u8f91\u6216 (||)\u3002<\/li>\n<li>\u4f4e&#xff1a;\u4e09\u5143 (? :)\u3002<\/li>\n<li>\u6700\u4f4e&#xff1a;\u8d4b\u503c (&#061;, &#043;&#061; \u7b49)\u3002<\/li>\n<\/ul>\n<h4>2. \u7ed3\u5408\u6027 (Associativity)<\/h4>\n<p>\u5f53\u4f18\u5148\u7ea7\u76f8\u540c\u65f6&#xff0c;\u51b3\u5b9a\u4ece\u5de6\u5f80\u53f3\u8fd8\u662f\u4ece\u53f3\u5f80\u5de6\u7b97\u3002<\/p>\n<ul>\n<li>\u5de6\u7ed3\u5408&#xff1a;\u5927\u591a\u6570\u8fd0\u7b97\u7b26&#xff08;\u5982 &#043;, *, &#061; \u4ee5\u5916\u7684\u8fd0\u7b97&#xff09;\u3002<\/li>\n<li>\u53f3\u7ed3\u5408&#xff1a;\u4e00\u5143\u8fd0\u7b97\u7b26\u3001\u4e09\u5143\u8fd0\u7b97\u7b26\u3001\u8d4b\u503c\u8fd0\u7b97\u7b26\u3002\n<ul>\n<li>\u4f8b&#xff1a;a &#061; b &#061; c \u7b49\u4ef7\u4e8e a &#061; (b &#061; c)\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>3. \u6838\u5fc3\u539f\u5219<\/h4>\n<ul>\n<li>\u62ec\u53f7\u4f18\u5148\u7ea7\u6700\u9ad8&#xff1a;\u4e0d\u786e\u5b9a\u65f6&#xff0c;\u6c38\u8fdc\u52a0\u62ec\u53f7 ( )\u3002<\/li>\n<li>\u53ef\u8bfb\u6027\u7b2c\u4e00&#xff1a;\u590d\u6742\u8868\u8fbe\u5f0f\u62c6\u5206\u4e3a\u4e2d\u95f4\u53d8\u91cf&#xff0c;\u4e0d\u8981\u8003\u9a8c\u8bfb\u8005\u7684\u8bb0\u5fc6\u529b\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 43 \u671f&#xff1a;\u8868\u8fbe\u5f0f\u6c42\u503c\u987a\u5e8f\u8be6\u89e3<\/h3>\n<h4>1. \u4f18\u5148\u7ea7 vs \u6c42\u503c\u987a\u5e8f<\/h4>\n<ul>\n<li>\u4f18\u5148\u7ea7&#xff1a;\u51b3\u5b9a\u8fd0\u7b97\u7b26\u7684\u7ed3\u5408\u987a\u5e8f&#xff08;\u5148\u4e58\u9664\u540e\u52a0\u51cf&#xff09;\u3002<\/li>\n<li>\u6c42\u503c\u987a\u5e8f&#xff1a;\u51b3\u5b9a\u64cd\u4f5c\u6570\u7684\u8ba1\u7b97\u987a\u5e8f\u3002<\/li>\n<\/ul>\n<h4>2. Java \u7684\u89c4\u5219&#xff1a;\u4ece\u5de6\u5230\u53f3<\/h4>\n<p>Java \u89c4\u5b9a\u64cd\u4f5c\u6570\u7684\u6c42\u503c\u987a\u5e8f\u59cb\u7ec8\u662f\u4ece\u5de6\u5230\u53f3\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token comment\">\/\/ 1. \u8ba1\u7b97\u5de6\u8fb9 a&#043;&#043;&#xff1a;\u53d6\u539f\u503c 10&#xff0c;a \u53d8\u4e3a 11<\/span><br \/>\n<span class=\"token comment\">\/\/ 2. \u8ba1\u7b97\u53f3\u8fb9 a*2&#xff1a;\u6b64\u65f6 a \u5df2\u662f 11&#xff0c;\u7ed3\u679c\u4e3a 22<\/span><br \/>\n<span class=\"token comment\">\/\/ 3. \u76f8\u52a0&#xff1a;10 &#043; 22 &#061; 32<\/span><\/p>\n<h4>3. \u6700\u4f73\u5b9e\u8df5<\/h4>\n<ul>\n<li>\u907f\u514d\u526f\u4f5c\u7528&#xff1a;\u4e0d\u8981\u5728\u8868\u8fbe\u5f0f\u4e2d\u4f9d\u8d56\u6c42\u503c\u987a\u5e8f&#xff08;\u5982\u6df7\u7528\u81ea\u589e\u548c\u4e58\u6cd5&#xff09;\u3002<\/li>\n<li>\u62c6\u5206\u4ee3\u7801&#xff1a;\u6709\u526f\u4f5c\u7528\u7684\u64cd\u4f5c\u5e94\u5355\u72ec\u6210\u884c&#xff0c;\u4f7f\u7528\u4e2d\u95f4\u53d8\u91cf&#xff0c;\u63d0\u9ad8\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 44 \u671f&#xff1a;\u7c7b\u578b\u63a8\u65ad\u4e0e var \u5173\u952e\u5b57 (Java 10&#043;)<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<p>var \u662f Java 10 \u5f15\u5165\u7684\u5173\u952e\u5b57&#xff0c;\u7528\u4e8e\u5c40\u90e8\u53d8\u91cf\u7c7b\u578b\u63a8\u65ad\u3002\u7f16\u8bd1\u5668\u6839\u636e\u53f3\u4fa7\u521d\u59cb\u5316\u503c\u81ea\u52a8\u63a8\u5bfc\u5de6\u4fa7\u53d8\u91cf\u7c7b\u578b\u3002<\/p>\n<p><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\">\/\/ \u7f16\u8bd1\u5668\u63a8\u65ad list \u4e3a ArrayList&lt;String&gt;<\/span><\/p>\n<h4>2. \u672c\u8d28<\/h4>\n<ul>\n<li>\u975e\u52a8\u6001\u7c7b\u578b&#xff1a;\u7f16\u8bd1\u540e\u7c7b\u578b\u4f9d\u7136\u786e\u5b9a&#xff0c;Java \u4ecd\u662f\u5f3a\u7c7b\u578b\u8bed\u8a00\u3002<\/li>\n<li>\u8bed\u6cd5\u7cd6&#xff1a;\u4ec5\u4e3a\u4e86\u51cf\u5c11\u91cd\u590d\u4ee3\u7801&#xff0c;\u4e0d\u6539\u53d8\u8fd0\u884c\u65f6\u884c\u4e3a\u3002<\/li>\n<\/ul>\n<h4>3. \u4f7f\u7528\u89c4\u5219<\/h4>\n<ul>\n<li>\u2705 \u53ef\u7528&#xff1a;\u5c40\u90e8\u53d8\u91cf&#xff0c;\u4e14\u5fc5\u987b\u58f0\u660e\u65f6\u521d\u59cb\u5316\u3002<\/li>\n<li>\u274c \u4e0d\u53ef\u7528&#xff1a;\n<ul>\n<li>\u6210\u5458\u53d8\u91cf&#xff08;\u5b57\u6bb5&#xff09;\u3002<\/li>\n<li>\u65b9\u6cd5\u53c2\u6570\u3002<\/li>\n<li>\u65b9\u6cd5\u8fd4\u56de\u503c\u3002<\/li>\n<li>\u53ea\u58f0\u660e\u4e0d\u521d\u59cb\u5316 (var a;)\u3002<\/li>\n<li>\u521d\u59cb\u503c\u4e3a null\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u89c1\u540d\u77e5\u610f&#xff1a;\u7531\u4e8e\u7c7b\u578b\u9690\u85cf&#xff0c;\u53d8\u91cf\u540d\u5fc5\u987b\u6e05\u6670\u8868\u8fbe\u5176\u542b\u4e49&#xff08;\u5982 var userList \u800c\u975e var a&#xff09;\u3002<\/li>\n<li>\u9002\u5ea6\u4f7f\u7528&#xff1a;\u82e5\u53f3\u4fa7\u7c7b\u578b\u4e0d\u660e\u663e\u6216\u964d\u4f4e\u53ef\u8bfb\u6027&#xff0c;\u4e0d\u5efa\u8bae\u4f7f\u7528\u3002<\/li>\n<li>\u57fa\u672c\u7c7b\u578b\u6ce8\u610f&#xff1a;\u6574\u6570\u9ed8\u8ba4\u63a8\u65ad\u4e3a int&#xff0c;\u5c0f\u6570\u9ed8\u8ba4\u63a8\u65ad\u4e3a double\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 45 \u671f&#xff1a;\u8fd0\u7b97\u7b26\u7efc\u5408\u5b9e\u6218\u7ec3\u4e60<\/h3>\n<p>\u901a\u8fc7\u4ee5\u4e0b\u6848\u4f8b\u5de9\u56fa\u8fd0\u7b97\u7b26\u77e5\u8bc6&#xff1a;<\/p>\n<li>\u6e29\u5ea6\u8f6c\u6362&#xff1a;\u6444\u6c0f\u8f6c\u534e\u6c0f&#xff0c;\u6ce8\u610f\u6d6e\u70b9\u6570\u9664\u6cd5\u3002<\/li>\n<li>\u95f0\u5e74\u5224\u65ad&#xff1a;\u7ed3\u5408\u53d6\u6a21 %\u3001\u903b\u8f91 &amp;&amp;\/|| \u548c\u4e09\u5143\u8fd0\u7b97\u7b26\u3002<span class=\"token keyword\">boolean<\/span> isLeap <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>year <span class=\"token operator\">%<\/span> <span class=\"token number\">4<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> year <span class=\"token operator\">%<\/span> <span class=\"token number\">100<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token punctuation\">(<\/span>year <span class=\"token operator\">%<\/span> <span class=\"token number\">400<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n<\/li>\n<li>\u6570\u5b57\u62c6\u5206&#xff1a;\u5229\u7528 \/ \u548c % \u63d0\u53d6\u767e\u4f4d\u3001\u5341\u4f4d\u3001\u4e2a\u4f4d\u3002<\/li>\n<li>\u53d8\u91cf\u4ea4\u6362&#xff1a;\n<ul>\n<li>\u4e34\u65f6\u53d8\u91cf\u6cd5&#xff08;\u63a8\u8350&#xff09;\u3002<\/li>\n<li>\u52a0\u51cf\u6cd5&#xff08;\u6709\u6ea2\u51fa\u98ce\u9669&#xff09;\u3002<\/li>\n<li>\u5f02\u6216\u6cd5&#xff08;\u9762\u8bd5\u5e38\u89c1&#xff0c;\u5b9e\u9645\u5c11\u7528&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u6c34\u4ed9\u82b1\u6570&#xff1a;\u63d0\u53d6\u5404\u4f4d\u6570\u5b57\u5e76\u8fdb\u884c\u5e42\u8fd0\u7b97\u5224\u65ad\u3002<\/li>\n<hr \/>\n<h3>\u7b2c 46 \u671f&#xff1a;if \u8bed\u53e5\u7684\u7b2c\u4e00\u79cd\u683c\u5f0f<\/h3>\n<h4>1. \u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>\u6761\u4ef6\u8868\u8fbe\u5f0f<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    \u8bed\u53e5\u4f53<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u6267\u884c\u6d41&#xff1a;\u6761\u4ef6\u4e3a true \u6267\u884c\u8bed\u53e5\u4f53&#xff1b;false \u8df3\u8fc7\u3002<\/li>\n<\/ul>\n<h4>2. \u5173\u952e\u6ce8\u610f\u70b9<\/h4>\n<li>\u6761\u4ef6\u5fc5\u987b\u662f boolean&#xff1a;Java \u4e0d\u652f\u6301\u9690\u5f0f\u8f6c\u6362&#xff08;\u5982 if (1) \u975e\u6cd5&#xff09;\u3002<\/li>\n<li>\u5927\u62ec\u53f7\u5efa\u8bae\u4fdd\u7559&#xff1a;\u5373\u4f7f\u53ea\u6709\u4e00\u884c\u4ee3\u7801\u4e5f\u5efa\u8bae\u5199 {}&#xff0c;\u9632\u6b62\u540e\u7eed\u6dfb\u52a0\u4ee3\u7801\u65f6\u4ea7\u751f\u903b\u8f91\u9519\u8bef\u3002<\/li>\n<li>\u4e25\u7981\u5206\u53f7\u8bef\u7528&#xff1a;if (cond); {} \u4f1a\u5bfc\u81f4\u5927\u62ec\u53f7\u5185\u7684\u4ee3\u7801\u65e0\u6761\u4ef6\u6267\u884c\u3002<\/li>\n<hr \/>\n<h3>\u7b2c 47 \u671f&#xff1a;if\u2026else \u8bed\u53e5\u7684\u7b2c\u4e8c\u79cd\u683c\u5f0f<\/h3>\n<h4>1. \u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>\u6761\u4ef6\u8868\u8fbe\u5f0f<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    \u8bed\u53e5\u4f53<span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    \u8bed\u53e5\u4f53<span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u6267\u884c\u6d41&#xff1a;\u4e8c\u9009\u4e00\u3002\u6761\u4ef6\u6210\u7acb\u6267\u884c\u8bed\u53e5\u4f531&#xff0c;\u5426\u5219\u6267\u884c\u8bed\u53e5\u4f532\u3002<\/li>\n<\/ul>\n<h4>2. \u4e0e\u4e09\u5143\u8fd0\u7b97\u7b26\u5bf9\u6bd4<\/h4>\n<ul>\n<li>\u4e09\u5143\u8fd0\u7b97\u7b26&#xff1a;\u9002\u7528\u4e8e\u7b80\u5355\u7684\u53d6\u503c\u64cd\u4f5c&#xff08;\u8868\u8fbe\u5f0f&#xff0c;\u6709\u8fd4\u56de\u503c&#xff09;\u3002<\/li>\n<li>if\u2026else&#xff1a;\u9002\u7528\u4e8e\u590d\u6742\u7684\u903b\u8f91\u6267\u884c&#xff08;\u8bed\u53e5&#xff0c;\u65e0\u8fd4\u56de\u503c&#xff0c;\u53ef\u6267\u884c\u591a\u6761\u8bed\u53e5&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 48 \u671f&#xff1a;if\u2026else if\u2026else \u7b2c\u4e09\u79cd\u683c\u5f0f<\/h3>\n<h4>1. \u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>\u6761\u4ef6<span class=\"token number\">1<\/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><br \/>\n<span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>\u6761\u4ef6<span class=\"token number\">2<\/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><br \/>\n<span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>\u6761\u4ef6<span class=\"token number\">3<\/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><br \/>\n<span class=\"token keyword\">else<\/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><\/p>\n<h4>2. \u6267\u884c\u903b\u8f91<\/h4>\n<ul>\n<li>\u4ece\u4e0a\u5f80\u4e0b\u4f9d\u6b21\u5224\u65ad\u3002<\/li>\n<li>\u77ed\u8def\u7279\u6027&#xff1a;\u4e00\u65e6\u67d0\u4e2a\u6761\u4ef6\u6210\u7acb&#xff0c;\u6267\u884c\u5bf9\u5e94\u8bed\u53e5\u5757\u540e&#xff0c;\u6574\u4e2a\u7ed3\u6784\u7ed3\u675f&#xff0c;\u4e0d\u518d\u5224\u65ad\u540e\u7eed\u6761\u4ef6\u3002<\/li>\n<li>\u6700\u591a\u6267\u884c\u4e00\u4e2a\u5206\u652f\u3002<\/li>\n<\/ul>\n<h4>3. \u91cd\u8981\u539f\u5219<\/h4>\n<ul>\n<li>\u987a\u5e8f\u81f3\u5173\u91cd\u8981&#xff1a;\u8303\u56f4\u5224\u65ad\u5e94\u4ece\u5927\u5230\u5c0f\u6216\u4ece\u5c0f\u5230\u5927\u6392\u5217&#xff0c;\u907f\u514d\u201c\u5927\u533a\u95f4\u201d\u5728\u524d\u5bfc\u81f4\u201c\u5c0f\u533a\u95f4\u201d\u6c38\u8fdc\u65e0\u6cd5\u547d\u4e2d\u3002<\/li>\n<li>\u9002\u7528\u573a\u666f&#xff1a;\u591a\u5206\u652f\u4e92\u65a5\u5224\u65ad&#xff08;\u5982\u6210\u7ee9\u7b49\u7ea7\u3001\u6708\u4efd\u5b63\u8282&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 49 \u671f&#xff1a;if \u8bed\u53e5\u7684\u5d4c\u5957\u4f7f\u7528<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<p>\u5728 if \u6216 else \u7684\u4ee3\u7801\u5757\u5185\u90e8\u518d\u7f16\u5199 if \u8bed\u53e5\u3002<\/p>\n<h4>2. else \u914d\u5bf9\u89c4\u5219<\/h4>\n<ul>\n<li>\u5c31\u8fd1\u539f\u5219&#xff1a;else \u603b\u662f\u4e0e\u6700\u8fd1\u4e14\u672a\u914d\u5bf9\u7684 if \u914d\u5bf9\u3002<\/li>\n<li>\u5efa\u8bae&#xff1a;\u52a1\u5fc5\u4f7f\u7528\u5927\u62ec\u53f7 {} \u660e\u786e\u4f5c\u7528\u57df&#xff0c;\u907f\u514d\u6b67\u4e49\u3002<\/li>\n<\/ul>\n<h4>3. \u8bbe\u8ba1\u5efa\u8bae<\/h4>\n<ul>\n<li>\u5c42\u7ea7\u9650\u5236&#xff1a;\u5d4c\u5957\u5c42\u6570\u5c3d\u91cf\u4e0d\u8d85\u8fc7 3 \u5c42\u3002<\/li>\n<li>\u4f18\u5148\u5408\u5e76&#xff1a;\u80fd\u7528\u903b\u8f91\u8fd0\u7b97\u7b26 (&amp;&amp;, ||) \u5408\u5e76\u6761\u4ef6\u7684&#xff0c;\u5c3d\u91cf\u4e0d\u7528\u5d4c\u5957\u3002<\/li>\n<li>\u4f18\u5148 else-if&#xff1a;\u591a\u4e2a\u5e76\u5217\u6761\u4ef6\u5224\u65ad&#xff0c;\u4f18\u5148\u4f7f\u7528 else if \u94fe&#xff0c;\u800c\u975e\u6df1\u5c42\u5d4c\u5957\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 50 \u671f&#xff1a;switch \u8bed\u53e5\u7684\u57fa\u7840\u8bed\u6cd5<\/h3>\n<h4>1. \u8bed\u6cd5\u7ed3\u6784<\/h4>\n<p><span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>\u8868\u8fbe\u5f0f<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> \u5e38\u91cf<span class=\"token number\">1<\/span><span class=\"token operator\">:<\/span><br \/>\n        \u8bed\u53e5\u4f53<span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8df3\u51fa switch<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> \u5e38\u91cf<span class=\"token number\">2<\/span><span class=\"token operator\">:<\/span><br \/>\n        \u8bed\u53e5\u4f53<span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/span><br \/>\n        \u8bed\u53e5\u4f53n<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2. \u6267\u884c\u6d41\u7a0b<\/h4>\n<li>\u8ba1\u7b97\u8868\u8fbe\u5f0f\u503c\u3002<\/li>\n<li>\u5339\u914d\u5bf9\u5e94\u7684 case \u5e38\u91cf\u3002<\/li>\n<li>\u6267\u884c\u5339\u914d\u5230\u7684\u8bed\u53e5\u4f53\u3002<\/li>\n<li>\u9047\u5230 break \u8df3\u51fa switch&#xff1b;\u82e5\u65e0 break \u5219\u53d1\u751f\u7a7f\u900f&#xff08;Case Fall-through&#xff09;&#xff0c;\u7ee7\u7eed\u6267\u884c\u4e0b\u4e00\u4e2a case\u3002<\/li>\n<h4>3. switch vs if<\/h4>\n<table>\n<tr>\u7279\u6027switchif<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u9002\u7528\u573a\u666f<\/td>\n<td align=\"left\">\u7b49\u503c\u5224\u65ad (\u503c\u4e0d\u591a)<\/td>\n<td align=\"left\">\u8303\u56f4\u5224\u65ad, \u590d\u6742\u5e03\u5c14\u903b\u8f91<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6570\u636e\u7c7b\u578b<\/td>\n<td align=\"left\">byte, short, int, char, String, enum<\/td>\n<td align=\"left\">\u4efb\u610f\u7c7b\u578b<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6027\u80fd<\/td>\n<td align=\"left\">\u5e95\u5c42\u53ef\u80fd\u4f18\u5316\u4e3a\u8df3\u8f6c\u8868&#xff0c;\u6548\u7387\u8f83\u9ad8<\/td>\n<td align=\"left\">\u9010\u6761\u5224\u65ad<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<li>Case \u5fc5\u987b\u662f\u5e38\u91cf&#xff1a;\u4e0d\u80fd\u662f\u53d8\u91cf\u6216\u8303\u56f4\u8868\u8fbe\u5f0f\u3002<\/li>\n<li>Default \u4f4d\u7f6e&#xff1a;\u53ef\u653e\u5728\u4efb\u610f\u4f4d\u7f6e&#xff0c;\u4f46\u901a\u5e38\u653e\u6700\u540e\u3002\u6240\u6709 case \u4e0d\u5339\u914d\u65f6\u6267\u884c\u3002<\/li>\n<li>Break \u7684\u91cd\u8981\u6027&#xff1a;\u9664\u975e\u6545\u610f\u9700\u8981\u7a7f\u900f&#xff0c;\u5426\u5219\u6bcf\u4e2a case \u540e\u90fd\u5e94\u52a0\u4e0a break\u3002<\/li>\n<hr \/>\n<p>\u7ed3\u8bed&#xff1a;\u606d\u559c&#xff01;\u4f60\u5df2\u7ecf\u638c\u63e1\u4e86 Java \u57fa\u7840\u8bed\u6cd5\u7684\u4e24\u5927\u652f\u67f1&#xff1a;\u8fd0\u7b97\u7b26\u548c\u9009\u62e9\u7ed3\u6784\u3002\u73b0\u5728\u4f60\u53ef\u4ee5\u7f16\u5199\u5177\u6709\u903b\u8f91\u5224\u65ad\u80fd\u529b\u7684\u7a0b\u5e8f\u4e86\u3002\u63a5\u4e0b\u6765\u7684\u8bfe\u7a0b\u5c06\u8fdb\u5165\u5faa\u73af\u7ed3\u6784&#xff08;while, for, do-while&#xff09;&#xff0c;\u8ba9\u7a0b\u5e8f\u80fd\u591f\u5904\u7406\u91cd\u590d\u6027\u4efb\u52a1\u3002<\/p>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 51-60 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u6df1\u5165\u8bb2\u89e3 switch \u8bed\u53e5\u7684\u7ec6\u8282&#xff08;break\u3001\u7a7f\u900f\u3001\u6570\u636e\u7c7b\u578b&#xff09;&#xff0c;\u5bf9\u6bd4 if \u4e0e switch \u7684\u4f7f\u7528\u573a\u666f&#xff0c;\u5e76\u7cfb\u7edf\u5b66\u4e60\u5faa\u73af\u7ed3\u6784&#xff08;while, do-while, for&#xff09;&#xff0c;\u5305\u62ec\u5d4c\u5957\u5faa\u73af\u3001\u56fe\u5f62\u6253\u5370\u4ee5\u53ca\u63a7\u5236\u8df3\u8f6c\u8bed\u53e5 break \u548c continue\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 51 \u671f&#xff1a;switch \u8bed\u53e5\u4e2d break \u7684\u4f5c\u7528\u4e0e Case \u7a7f\u900f<\/h3>\n<h4>1. break \u7684\u4f5c\u7528<\/h4>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u8df3\u51fa switch \u8bed\u53e5\u5757&#xff0c;\u7ec8\u6b62\u540e\u7eed\u6267\u884c\u3002<\/li>\n<li>\u7f3a\u5931\u540e\u679c&#xff1a;\u5982\u679c\u6ca1\u6709 break&#xff0c;\u7a0b\u5e8f\u4f1a\u53d1\u751f Case \u7a7f\u900f (Fall-through)\u3002<\/li>\n<\/ul>\n<h4>2. Case \u7a7f\u900f<\/h4>\n<ul>\n<li>\u73b0\u8c61&#xff1a;\u4ece\u5339\u914d\u7684 case \u5f00\u59cb&#xff0c;\u4e00\u76f4\u5411\u4e0b\u6267\u884c\u6240\u6709\u8bed\u53e5&#xff0c;\u76f4\u5230\u9047\u5230 break \u6216 switch \u7ed3\u675f\u3002<\/li>\n<li>\u793a\u4f8b&#xff1a;<span class=\"token keyword\">int<\/span> week <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">switch<\/span> <span class=\"token punctuation\">(<\/span>week<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">1<\/span><span class=\"token operator\">:<\/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;\u5468\u4e00&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4e0d\u6267\u884c<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">2<\/span><span class=\"token operator\">:<\/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;\u5468\u4e8c&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6267\u884c<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">3<\/span><span class=\"token operator\">:<\/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;\u5468\u4e09&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7a7f\u900f\u6267\u884c<\/span><br \/>\n    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/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;\u5176\u4ed6&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7a7f\u900f\u6267\u884c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;\u5468\u4e8c\\\\n\u5468\u4e09\\\\n\u5176\u4ed6<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>3. \u5408\u7406\u5229\u7528\u7a7f\u900f<\/h4>\n<p>\u5f53\u591a\u4e2a case \u9700\u8981\u6267\u884c\u76f8\u540c\u7684\u4ee3\u7801\u903b\u8f91\u65f6&#xff0c;\u53ef\u4ee5\u5229\u7528\u7a7f\u900f\u7b80\u5316\u4ee3\u7801&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> day <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">3<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<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 number\">1<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">2<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">3<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">4<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">5<\/span><span class=\"token operator\">:<\/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;\u5de5\u4f5c\u65e5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">6<\/span><span class=\"token operator\">:<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">7<\/span><span class=\"token operator\">:<\/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;\u4f11\u606f\u65e5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span><span class=\"token operator\">:<\/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;\u65e0\u6548&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u9ed8\u8ba4\u5efa\u8bae\u5199 break&#xff1a;\u9664\u975e\u6709\u610f\u5229\u7528\u7a7f\u900f&#xff0c;\u5426\u5219\u6bcf\u4e2a case \u540e\u90fd\u5e94\u52a0 break\u3002<\/li>\n<li>\u6700\u540e\u4e00\u4e2a break&#xff1a;default \u6216\u6700\u540e\u4e00\u4e2a case \u540e\u7684 break \u53ef\u7701\u7565&#xff08;\u56e0\u4e3a\u540e\u9762\u6ca1\u4ee3\u7801\u4e86&#xff09;&#xff0c;\u4f46\u4e3a\u4e86\u89c4\u8303\u5efa\u8bae\u4fdd\u7559\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 52 \u671f&#xff1a;switch \u652f\u6301\u7684\u6570\u636e\u7c7b\u578b<\/h3>\n<h4>1. \u652f\u6301\u7684\u7c7b\u578b<\/h4>\n<p>Java switch \u8868\u8fbe\u5f0f\u652f\u6301\u4ee5\u4e0b\u7c7b\u578b&#xff1a;<\/p>\n<ul>\n<li>\u57fa\u672c\u7c7b\u578b&#xff1a;byte, short, int, char\u3002\n<ul>\n<li>\u4e0d\u652f\u6301&#xff1a;long (\u592a\u5927), float\/double (\u7cbe\u5ea6\u95ee\u9898), boolean (\u53ea\u6709\u4e24\u4e2a\u503c)\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5f15\u7528\u7c7b\u578b&#xff1a;\n<ul>\n<li>String (Java 7&#043;)\u3002<\/li>\n<li>enum (\u679a\u4e3e, Java 5&#043;)\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5305\u88c5\u7c7b&#xff1a;Byte, Short, Integer, Character (\u81ea\u52a8\u62c6\u7bb1)\u3002<\/li>\n<\/ul>\n<h4>2. \u4e3a\u4ec0\u4e48\u4e0d\u652f\u6301 Long\/Double&#xff1f;<\/h4>\n<ul>\n<li>switch \u5e95\u5c42\u57fa\u4e8e\u6574\u6570\u503c\u6bd4\u8f83\u5b9e\u73b0\u3002<\/li>\n<li>long \u8303\u56f4\u8d85\u51fa int&#xff0c;\u8f6c\u6362\u53ef\u80fd\u4e22\u5931\u7cbe\u5ea6\u3002<\/li>\n<li>float\/double \u5b58\u5728\u7cbe\u5ea6\u8bef\u5dee&#xff0c;\u76f8\u7b49\u6027\u5224\u65ad\u4e0d\u53ef\u9760\u3002<\/li>\n<\/ul>\n<h4>3. String \u7684\u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>case \u4e2d\u7684\u5b57\u7b26\u4e32\u4e0d\u80fd\u4e3a null&#xff0c;\u5426\u5219\u4f1a\u629b\u51fa NullPointerException\u3002<\/li>\n<li>\u4f7f\u7528 equals() \u8fdb\u884c\u5185\u90e8\u6bd4\u8f83&#xff0c;\u6027\u80fd\u4f18\u4e8e\u591a\u6b21 if-else\u3002<\/li>\n<\/ul>\n<h4>4. Java 12&#043; \u65b0\u7279\u6027 (Switch \u8868\u8fbe\u5f0f)<\/h4>\n<p>Java 12 \u5f15\u5165\u7bad\u5934\u8bed\u6cd5 -&gt;&#xff0c;\u65e0\u9700 break&#xff0c;\u907f\u514d\u7a7f\u900f&#xff1a;<\/p>\n<p><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>day<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">case<\/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 operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u5de5\u4f5c\u65e5&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">case<\/span> <span class=\"token number\">6<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">7<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u4f11\u606f\u65e5&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">default<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token string\">&#034;\u65e0\u6548&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<hr \/>\n<h3>\u7b2c 53 \u671f&#xff1a;if \u4e0e switch \u7684\u9009\u62e9\u4e0e\u533a\u522b<\/h3>\n<table>\n<tr>\u7279\u6027if \u2026 elseswitch \u2026 case<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u9002\u7528\u573a\u666f<\/td>\n<td align=\"left\">\u8303\u56f4\u5224\u65ad\u3001\u590d\u6742\u903b\u8f91\u3001\u5e03\u5c14\u5224\u65ad<\/td>\n<td align=\"left\">\u7b49\u503c\u5224\u65ad\u3001\u5206\u652f\u8f83\u591a\u4e14\u56fa\u5b9a<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u652f\u6301\u7c7b\u578b<\/td>\n<td align=\"left\">\u4efb\u610f\u7c7b\u578b (\u7ed3\u679c\u9700\u4e3a boolean)<\/td>\n<td align=\"left\">byte, short, int, char, String, enum<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u7075\u6d3b\u6027<\/td>\n<td align=\"left\">\u9ad8<\/td>\n<td align=\"left\">\u4f4e (\u4ec5\u9650\u7b49\u503c)<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6548\u7387<\/td>\n<td align=\"left\">\u5206\u652f\u591a\u65f6\u9010\u6761\u5224\u65ad<\/td>\n<td align=\"left\">\u5e95\u5c42\u4f18\u5316\u4e3a\u8df3\u8f6c\u8868&#xff0c;\u6548\u7387\u8f83\u9ad8<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u53ef\u8bfb\u6027<\/td>\n<td align=\"left\">\u5206\u652f\u591a\u65f6\u4ee3\u7801\u5197\u957f<\/td>\n<td align=\"left\">\u7ed3\u6784\u6e05\u6670&#xff0c;\u6613\u4e8e\u7ef4\u62a4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>\u9009\u62e9\u5efa\u8bae<\/h4>\n<li>\u7528 switch&#xff1a;\u5224\u65ad\u67d0\u4e2a\u53d8\u91cf\u662f\u5426\u7b49\u4e8e\u51e0\u4e2a\u56fa\u5b9a\u7684\u503c&#xff08;\u5982\u661f\u671f\u51e0\u3001\u83dc\u5355\u9009\u9879\u3001\u72b6\u6001\u7801&#xff09;\u3002<\/li>\n<li>\u7528 if&#xff1a;\n<ul>\n<li>\u8303\u56f4\u5224\u65ad (&gt;, &lt;, &gt;&#061;)\u3002<\/li>\n<li>\u590d\u6742\u6761\u4ef6\u7ec4\u5408 (&amp;&amp;, ||)\u3002<\/li>\n<li>\u5224\u65ad\u7c7b\u578b\u4e0d\u652f\u6301 switch (long, double, boolean)\u3002<\/li>\n<li>\u5b57\u7b26\u4e32\u5305\u542b\u3001\u524d\u7f00\u7b49\u975e\u7cbe\u786e\u5339\u914d\u3002<\/li>\n<\/ul>\n<\/li>\n<hr \/>\n<h3>\u7b2c 54 \u671f&#xff1a;while \u5faa\u73af\u7684\u57fa\u672c\u7ed3\u6784<\/h3>\n<h4>1. \u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>\u6761\u4ef6\u8868\u8fbe\u5f0f<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    \u5faa\u73af\u4f53<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u6d41\u7a0b&#xff1a;\u5148\u5224\u65ad\u6761\u4ef6&#xff0c;\u82e5\u4e3a true \u5219\u6267\u884c\u5faa\u73af\u4f53&#xff0c;\u518d\u56de\u5230\u5224\u65ad\u3002<\/li>\n<\/ul>\n<h4>2. \u5faa\u73af\u4e09\u8981\u7d20<\/h4>\n<li>\u521d\u59cb\u5316&#xff1a;\u5faa\u73af\u5f00\u59cb\u524d\u8bbe\u7f6e\u521d\u59cb\u72b6\u6001\u3002<\/li>\n<li>\u6761\u4ef6\u5224\u65ad&#xff1a;\u51b3\u5b9a\u5faa\u73af\u662f\u5426\u7ee7\u7eed\u3002<\/li>\n<li>\u72b6\u6001\u6539\u53d8&#xff1a;\u6bcf\u6b21\u5faa\u73af\u540e\u4fee\u6539\u6761\u4ef6&#xff0c;\u786e\u4fdd\u6700\u7ec8\u80fd\u9000\u51fa&#xff08;\u5426\u5219\u6b7b\u5faa\u73af&#xff09;\u3002<\/li>\n<h4>3. \u5e38\u89c1\u9519\u8bef<\/h4>\n<ul>\n<li>\u6b7b\u5faa\u73af&#xff1a;\u7f3a\u5c11\u201c\u72b6\u6001\u6539\u53d8\u201d\u6b65\u9aa4\u3002<\/li>\n<li>\u5206\u53f7\u8bef\u7528&#xff1a;while(cond); {} \u4f1a\u5bfc\u81f4\u7a7a\u5faa\u73af&#xff0c;\u5927\u62ec\u53f7\u5185\u4ee3\u7801\u53ea\u6267\u884c\u4e00\u6b21\u6216\u4e0d\u6267\u884c\u3002<\/li>\n<li>\u7701\u7565\u5927\u62ec\u53f7&#xff1a;\u5efa\u8bae\u59cb\u7ec8\u4fdd\u7559 {} \u4ee5\u907f\u514d\u903b\u8f91\u9519\u8bef\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 55 \u671f&#xff1a;do\u2026while \u5faa\u73af\u4e0e while \u7684\u533a\u522b<\/h3>\n<h4>1. \u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">do<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    \u5faa\u73af\u4f53<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>\u6761\u4ef6\u8868\u8fbe\u5f0f<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6ce8\u610f\u672b\u5c3e\u5fc5\u987b\u6709\u5206\u53f7!<\/span><\/p>\n<h4>2. \u6838\u5fc3\u533a\u522b<\/h4>\n<ul>\n<li>while&#xff1a;\u5148\u5224\u65ad&#xff0c;\u540e\u6267\u884c\u3002\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6&#xff0c;\u5faa\u73af\u4f53\u4e00\u6b21\u90fd\u4e0d\u6267\u884c\u3002<\/li>\n<li>do\u2026while&#xff1a;\u5148\u6267\u884c&#xff0c;\u540e\u5224\u65ad\u3002\u65e0\u8bba\u6761\u4ef6\u5982\u4f55&#xff0c;\u5faa\u73af\u4f53\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u3002<\/li>\n<\/ul>\n<h4>3. \u4f7f\u7528\u573a\u666f<\/h4>\n<ul>\n<li>do\u2026while&#xff1a;\u9002\u7528\u4e8e\u5fc5\u987b\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u7684\u573a\u666f&#xff0c;\u5982\u83dc\u5355\u9009\u62e9\u3001\u7528\u6237\u8f93\u5165\u9a8c\u8bc1\u3002<\/li>\n<li>while&#xff1a;\u9002\u7528\u4e8e\u4e0d\u786e\u5b9a\u6b21\u6570&#xff0c;\u4e14\u53ef\u80fd\u4e00\u6b21\u90fd\u4e0d\u6267\u884c\u7684\u573a\u666f\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 56 \u671f&#xff1a;for \u5faa\u73af\u7684\u6807\u51c6\u683c\u5f0f<\/h3>\n<h4>1. \u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>\u521d\u59cb\u5316<span class=\"token punctuation\">;<\/span> \u6761\u4ef6\u5224\u65ad<span class=\"token punctuation\">;<\/span> \u8fed\u4ee3\u66f4\u65b0<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    \u5faa\u73af\u4f53<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>2. \u4f18\u52bf<\/h4>\n<ul>\n<li>\u7ed3\u6784\u6e05\u6670&#xff1a;\u4e09\u8981\u7d20\u96c6\u4e2d\u5728\u4e00\u884c&#xff0c;\u4fbf\u4e8e\u9605\u8bfb\u548c\u7ef4\u62a4\u3002<\/li>\n<li>\u9632\u6b62\u9057\u6f0f&#xff1a;\u4e0d\u6613\u5fd8\u8bb0\u66f4\u65b0\u5faa\u73af\u53d8\u91cf\u3002<\/li>\n<li>\u4f5c\u7528\u57df\u9650\u5236&#xff1a;\u5728\u521d\u59cb\u5316\u90e8\u5206\u5b9a\u4e49\u7684\u53d8\u91cf\u4ec5\u5728\u5faa\u73af\u5185\u6709\u6548\u3002<\/li>\n<\/ul>\n<h4>3. \u6267\u884c\u6d41\u7a0b<\/h4>\n<li>\u6267\u884c\u521d\u59cb\u5316 (\u4ec5\u4e00\u6b21)\u3002<\/li>\n<li>\u5224\u65ad\u6761\u4ef6\u3002<\/li>\n<li>\u82e5 true&#xff0c;\u6267\u884c\u5faa\u73af\u4f53\u3002<\/li>\n<li>\u6267\u884c\u8fed\u4ee3\u66f4\u65b0\u3002<\/li>\n<li>\u56de\u5230\u6b65\u9aa4 2\u3002<\/li>\n<h4>4. \u7701\u7565\u90e8\u5206<\/h4>\n<p>\u4e09\u4e2a\u90e8\u5206\u5747\u53ef\u7701\u7565&#xff0c;\u4f46\u5206\u53f7\u5fc5\u987b\u4fdd\u7559\u3002<\/p>\n<ul>\n<li>for (;;) { &#8230; } \u7b49\u4ef7\u4e8e while(true) \u6b7b\u5faa\u73af\u3002<\/li>\n<li>\u4e0d\u5efa\u8bae\u5b8c\u5168\u7701\u7565&#xff0c;\u4f1a\u964d\u4f4e\u53ef\u8bfb\u6027\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 57 \u671f&#xff1a;for \u5faa\u73af\u7684\u6267\u884c\u6d41\u7a0b\u56fe\u89e3<\/h3>\n<h4>1. \u6d41\u7a0b\u8be6\u89e3<\/h4>\n<ul>\n<li>\u521d\u59cb\u5316&#xff1a;\u53ea\u5728\u5faa\u73af\u5f00\u59cb\u65f6\u6267\u884c\u4e00\u6b21\u3002<\/li>\n<li>\u5224\u65ad&#xff1a;\u6bcf\u6b21\u8fdb\u5165\u5faa\u73af\u4f53\u524d\u68c0\u67e5\u3002<\/li>\n<li>\u5faa\u73af\u4f53&#xff1a;\u6267\u884c\u5177\u4f53\u903b\u8f91\u3002<\/li>\n<li>\u66f4\u65b0&#xff1a;\u5728\u5faa\u73af\u4f53\u6267\u884c\u5b8c\u6bd5\u540e\u6267\u884c&#xff0c;\u7136\u540e\u518d\u6b21\u5224\u65ad\u3002<\/li>\n<\/ul>\n<h4>2. \u5173\u952e\u70b9<\/h4>\n<ul>\n<li>i&#043;&#043; \u7684\u4f4d\u7f6e&#xff1a;\u5728\u5faa\u73af\u4f53\u4e4b\u540e\u6267\u884c\u3002<\/li>\n<li>\u5faa\u73af\u7ed3\u675f\u540e\u7684\u53d8\u91cf\u503c&#xff1a;\u901a\u5e38\u4e3a\u5bfc\u81f4\u6761\u4ef6\u5931\u8d25\u7684\u90a3\u4e2a\u503c\u3002\n<ul>\n<li>\u4f8b&#xff1a;for(int i&#061;1; i&lt;&#061;3; i&#043;&#043;)&#xff0c;\u5faa\u73af\u7ed3\u675f\u540e i \u4e3a 4\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>3. \u4e0e while \u7684\u7b49\u4ef7\u6027<\/h4>\n<p><span class=\"token comment\">\/\/ for \u5faa\u73af<\/span><br \/>\n<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span>init<span class=\"token punctuation\">;<\/span> cond<span class=\"token punctuation\">;<\/span> update<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> body<span class=\"token punctuation\">;<\/span> <span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7b49\u4ef7\u4e8e while \u5faa\u73af<\/span><br \/>\ninit<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>cond<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    body<span class=\"token punctuation\">;<\/span><br \/>\n    update<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>\u7b2c 58 \u671f&#xff1a;\u5faa\u73af\u5d4c\u5957&#xff1a;\u6253\u5370\u4e58\u6cd5\u53e3\u8bc0\u8868<\/h3>\n<h4>1. \u5d4c\u5957\u89c4\u5219<\/h4>\n<ul>\n<li>\u5916\u5c42\u5faa\u73af\u63a7\u5236\u884c\u6570\u3002<\/li>\n<li>\u5185\u5c42\u5faa\u73af\u63a7\u5236\u6bcf\u884c\u7684\u5217\u6570&#xff08;\u5185\u5bb9&#xff09;\u3002<\/li>\n<li>\u6267\u884c\u8282\u594f&#xff1a;\u5916\u5c42\u8d70\u4e00\u6b65&#xff0c;\u5185\u5c42\u8d70\u5b8c\u4e00\u5708\u3002<\/li>\n<\/ul>\n<h4>2. \u4e58\u6cd5\u53e3\u8bc0\u8868\u5b9e\u73b0<\/h4>\n<p><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\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">9<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>       <span class=\"token comment\">\/\/ \u5916\u5c42&#xff1a;\u884c<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;&#061;<\/span> i<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span>   <span class=\"token comment\">\/\/ \u5185\u5c42&#xff1a;\u5217&#xff0c;\u4e0d\u8d85\u8fc7\u5f53\u524d\u884c\u53f7<\/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\">print<\/span><span class=\"token punctuation\">(<\/span>j <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;*&#034;<\/span> <span class=\"token operator\">&#043;<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;&#061;&#034;<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token punctuation\">(<\/span>j<span class=\"token operator\">*<\/span>i<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\\\\t&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <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>            <span class=\"token comment\">\/\/ \u6bcf\u884c\u7ed3\u675f\u6362\u884c<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u7ec3\u4e60\u5efa\u8bae<\/h4>\n<ul>\n<li>\u6253\u5370\u4e09\u89d2\u5f62\u3001\u83f1\u5f62\u7b49\u56fe\u5f62\u662f\u953b\u70bc\u5d4c\u5957\u5faa\u73af\u903b\u8f91\u7684\u597d\u65b9\u6cd5\u3002<\/li>\n<li>\u5173\u952e\u5728\u4e8e\u627e\u51fa\u884c\u6570 i \u4e0e \u5217\u6570\/\u7a7a\u683c\u6570 \u4e4b\u95f4\u7684\u6570\u5b66\u5173\u7cfb\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 59 \u671f&#xff1a;\u5faa\u73af\u5d4c\u5957&#xff1a;\u6253\u5370\u5404\u79cd\u56fe\u5f62<\/h3>\n<p>\u901a\u8fc7\u8c03\u6574\u5185\u5c42\u5faa\u73af\u7684\u6761\u4ef6&#xff0c;\u53ef\u4ee5\u6253\u5370\u4e0d\u540c\u56fe\u6848&#xff1a;<\/p>\n<li>\u77e9\u5f62&#xff1a;\u5185\u5916\u5c42\u5faa\u73af\u6b21\u6570\u56fa\u5b9a\u3002<\/li>\n<li>\u76f4\u89d2\u4e09\u89d2\u5f62&#xff1a;\u5185\u5c42\u5faa\u73af\u6b21\u6570\u968f\u5916\u5c42 i \u53d8\u5316 (j &lt;&#061; i)\u3002<\/li>\n<li>\u53f3\u5bf9\u9f50\u4e09\u89d2\u5f62&#xff1a;\u6bcf\u884c\u5148\u6253\u5370\u7a7a\u683c (j &lt;&#061; rows &#8211; i)&#xff0c;\u518d\u6253\u5370\u661f\u53f7\u3002<\/li>\n<li>\u7b49\u8170\u4e09\u89d2\u5f62 (\u91d1\u5b57\u5854)&#xff1a;\n<ul>\n<li>\u7a7a\u683c\u6570&#xff1a;rows &#8211; i<\/li>\n<li>\u661f\u53f7\u6570&#xff1a;2 * i &#8211; 1<\/li>\n<\/ul>\n<\/li>\n<li>\u83f1\u5f62&#xff1a;\u5206\u4e3a\u4e0a\u534a\u90e8\u5206&#xff08;\u6b63\u4e09\u89d2&#xff09;\u548c\u4e0b\u534a\u90e8\u5206&#xff08;\u5012\u4e09\u89d2&#xff09;\u5206\u522b\u6253\u5370\u3002<\/li>\n<hr \/>\n<h3>\u7b2c 60 \u671f&#xff1a;break \u8df3\u51fa\u5faa\u73af\u8bed\u53e5<\/h3>\n<h4>1. break \u7684\u4f5c\u7528<\/h4>\n<ul>\n<li>\u529f\u80fd&#xff1a;\u7acb\u5373\u7ec8\u6b62\u5f53\u524d\u6240\u5728\u7684\u5faa\u73af\u6216 switch\u3002<\/li>\n<li>\u4f4d\u7f6e&#xff1a;\u901a\u5e38\u653e\u5728 if \u6761\u4ef6\u4e2d&#xff0c;\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u65f6\u89e6\u53d1\u3002<\/li>\n<\/ul>\n<h4>2. \u5728\u5faa\u73af\u4e2d\u7684\u5e94\u7528<\/h4>\n<ul>\n<li>\u63d0\u524d\u9000\u51fa&#xff1a;\u4f8b\u5982\u67e5\u627e\u76ee\u6807\u503c&#xff0c;\u627e\u5230\u540e\u7acb\u5373 break&#xff0c;\u8282\u7701\u65f6\u95f4\u3002<\/li>\n<li>\u6b7b\u5faa\u73af\u63a7\u5236&#xff1a;\u5728 while(true) \u4e2d\u901a\u8fc7\u6761\u4ef6\u5224\u65ad break \u9000\u51fa\u3002<\/li>\n<\/ul>\n<h4>3. \u5d4c\u5957\u5faa\u73af\u4e2d\u7684\u884c\u4e3a<\/h4>\n<ul>\n<li>break \u53ea\u80fd\u8df3\u51fa\u6700\u8fd1\u7684\u4e00\u5c42\u5faa\u73af&#xff08;\u5185\u5c42&#xff09;\u3002<\/li>\n<li>\u82e5\u8981\u8df3\u51fa\u591a\u5c42\u5faa\u73af&#xff0c;\u9700\u4f7f\u7528\u5e26\u6807\u7b7e\u7684 break (Labelled Break)&#xff0c;\u89c1\u4e0b\u4e00\u671f\u3002<\/li>\n<\/ul>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u4f5c\u7528\u57df\u9650\u5236&#xff1a;\u53ea\u80fd\u5728\u5faa\u73af\u6216 switch \u4e2d\u4f7f\u7528\u3002<\/li>\n<li>\u540e\u7eed\u4ee3\u7801\u4e0d\u53ef\u8fbe&#xff1a;break \u4e4b\u540e\u7684\u4ee3\u7801\u65e0\u6cd5\u6267\u884c&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u62a5\u9519\u3002<\/li>\n<li>\u4e0e return \u533a\u522b&#xff1a;\n<ul>\n<li>break&#xff1a;\u8df3\u51fa\u5faa\u73af&#xff0c;\u7ee7\u7eed\u6267\u884c\u65b9\u6cd5\u4e2d\u5269\u4f59\u4ee3\u7801\u3002<\/li>\n<li>return&#xff1a;\u7ed3\u675f\u6574\u4e2a\u65b9\u6cd5&#xff0c;\u8fd4\u56de\u8c03\u7528\u8005\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>5. \u7ecf\u5178\u6848\u4f8b&#xff1a;\u7d20\u6570\u5224\u65ad<\/h4>\n<p><span class=\"token keyword\">boolean<\/span> isPrime <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/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\">2<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> n<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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>n <span class=\"token operator\">%<\/span> i <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        isPrime <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u53d1\u73b0\u56e0\u5b50&#xff0c;\u4e0d\u662f\u7d20\u6570&#xff0c;\u76f4\u63a5\u9000\u51fa<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<p>\u7ed3\u8bed&#xff1a;\u606d\u559c&#xff01;\u4f60\u5df2\u7ecf\u638c\u63e1\u4e86 Java \u6d41\u7a0b\u63a7\u5236\u7684\u4e24\u5927\u6838\u5fc3\u652f\u67f1&#xff1a;\u9009\u62e9\u7ed3\u6784 (if\/switch) \u548c \u5faa\u73af\u7ed3\u6784 (while\/do-while\/for)\u3002\u73b0\u5728\u4f60\u53ef\u4ee5\u7f16\u5199\u5177\u6709\u590d\u6742\u903b\u8f91\u548c\u91cd\u590d\u5904\u7406\u80fd\u529b\u7684\u7a0b\u5e8f\u4e86\u3002\u63a5\u4e0b\u6765\u7684\u8bfe\u7a0b\u5c06\u8bb2\u89e3 continue \u8bed\u53e5\u4ee5\u53ca\u66f4\u9ad8\u7ea7\u7684\u6570\u7ec4\u548c\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u57fa\u7840\u3002<\/p>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 61-70 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u6df1\u5165\u8bb2\u89e3\u5faa\u73af\u63a7\u5236\u8bed\u53e5&#xff08;continue\u3001\u5e26\u6807\u7b7e\u7684 break\/continue&#xff09;\u3001\u6b7b\u5faa\u73af\u7684\u5e94\u7528&#xff0c;\u5e76\u7cfb\u7edf\u4ecb\u7ecd\u4e86 Random \u548c Math \u7c7b\u3002\u6700\u540e\u901a\u8fc7\u4e00\u7cfb\u5217\u7ecf\u5178\u7b97\u6cd5\u6848\u4f8b&#xff08;\u731c\u6570\u5b57\u3001\u95f0\u5e74\u3001\u6c34\u4ed9\u82b1\u6570\u3001\u6590\u6ce2\u90a3\u5951\u6570\u5217\u7b49&#xff09;\u7efc\u5408\u5e94\u7528\u6d41\u7a0b\u63a7\u5236\u77e5\u8bc6\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 61 \u671f&#xff1a;continue \u7ed3\u675f\u5355\u6b21\u5faa\u73af<\/h3>\n<h4>1. \u4f5c\u7528<\/h4>\n<ul>\n<li>continue&#xff1a;\u8df3\u8fc7\u672c\u6b21\u5faa\u73af\u4e2d\u5269\u4f59\u7684\u4ee3\u7801&#xff0c;\u76f4\u63a5\u8fdb\u5165\u4e0b\u4e00\u6b21\u5faa\u73af\u7684\u5224\u65ad\u6216\u66f4\u65b0\u6b65\u9aa4\u3002<\/li>\n<li>\u5bf9\u6bd4 break&#xff1a;break \u662f\u5f7b\u5e95\u7ec8\u6b62\u6574\u4e2a\u5faa\u73af&#xff1b;continue \u53ea\u662f\u8df3\u8fc7\u5f53\u524d\u8fd9\u4e00\u6b21\u8fed\u4ee3\u3002<\/li>\n<\/ul>\n<h4>2. \u793a\u4f8b&#xff1a;\u6253\u5370 1-10&#xff0c;\u8df3\u8fc7 5<\/h4>\n<p><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\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">10<\/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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8df3\u8fc7\u6253\u5370&#xff0c;\u76f4\u63a5\u8fdb\u884c i&#043;&#043;<\/span><br \/>\n    <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>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8f93\u51fa&#xff1a;1, 2, 3, 4, 6, 7, 8, 9, 10<\/span><\/p>\n<h4>3. \u6ce8\u610f\u4e8b\u9879&#xff1a;while \u4e2d\u7684\u6b7b\u5faa\u73af\u9677\u9631<\/h4>\n<p>\u5728 while \u5faa\u73af\u4e2d\u4f7f\u7528 continue \u65f6&#xff0c;\u5fc5\u987b\u786e\u4fdd\u6539\u53d8\u5faa\u73af\u6761\u4ef6\u7684\u8bed\u53e5\u4f4d\u4e8e continue \u4e4b\u524d&#xff0c;\u5426\u5219\u4f1a\u5bfc\u81f4\u6b7b\u5faa\u73af\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&lt;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>i <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8df3\u8fc7\u4e86\u4e0b\u9762\u7684 i&#043;&#043;&#xff0c;\u5bfc\u81f4 i \u6c38\u8fdc\u4e3a 5&#xff0c;\u6b7b\u5faa\u73af&#xff01;<\/span><br \/>\n    <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>i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<ul>\n<li>\u5efa\u8bae&#xff1a;\u5728 for \u5faa\u73af\u4e2d\u4f7f\u7528 continue \u66f4\u5b89\u5168&#xff0c;\u56e0\u4e3a i&#043;&#043; \u5728\u5faa\u73af\u5934\u4e2d&#xff0c;\u4e00\u5b9a\u4f1a\u6267\u884c\u3002<\/li>\n<\/ul>\n<h4>4. \u5d4c\u5957\u5faa\u73af\u4e2d\u7684\u884c\u4e3a<\/h4>\n<p>continue \u53ea\u80fd\u4f5c\u7528\u4e8e\u5f53\u524d\u6240\u5728\u5c42\u7684\u5faa\u73af\u3002\u5185\u5c42\u7684 continue \u4e0d\u4f1a\u5f71\u54cd\u5916\u5c42\u5faa\u73af\u7684\u6267\u884c\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 62 \u671f&#xff1a;\u5e26\u6807\u7b7e\u7684 break \u4e0e continue<\/h3>\n<h4>1. \u4ec0\u4e48\u662f\u6807\u7b7e<\/h4>\n<p>\u7ed9\u5faa\u73af\u8d77\u4e00\u4e2a\u540d\u5b57&#xff0c;\u683c\u5f0f\u4e3a \u6807\u7b7e\u540d: \u5faa\u73af\u8bed\u53e5\u3002<\/p>\n<p>outer<span class=\"token operator\">:<\/span> <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\">10<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/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><\/p>\n<h4>2. \u529f\u80fd<\/h4>\n<ul>\n<li>break outer;&#xff1a;\u76f4\u63a5\u8df3\u51fa\u540d\u4e3a outer \u7684\u5916\u5c42\u5faa\u73af&#xff0c;\u800c\u4e0d\u4ec5\u4ec5\u662f\u5f53\u524d\u5185\u5c42\u5faa\u73af\u3002<\/li>\n<li>continue outer;&#xff1a;\u76f4\u63a5\u8df3\u5230\u540d\u4e3a outer \u7684\u5916\u5c42\u5faa\u73af\u7684\u4e0b\u4e00\u6b21\u8fed\u4ee3\u3002<\/li>\n<\/ul>\n<h4>3. \u4f7f\u7528\u573a\u666f<\/h4>\n<p>\u4e3b\u8981\u7528\u4e8e\u591a\u5c42\u5d4c\u5957\u5faa\u73af\u4e2d\u9700\u8981\u4e00\u6b21\u6027\u8df3\u51fa\u6240\u6709\u5c42\u7ea7\u65f6\u3002\u4f46\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u8f83\u5c11\u4f7f\u7528&#xff0c;\u901a\u5e38\u53ef\u4ee5\u901a\u8fc7\u6807\u5fd7\u53d8\u91cf\u6216\u65b9\u6cd5\u8fd4\u56de\u6765\u5b9e\u73b0&#xff0c;\u4ee5\u4fdd\u6301\u4ee3\u7801\u53ef\u8bfb\u6027\u3002<\/p>\n<h4>4. \u9762\u8bd5\u8003\u70b9<\/h4>\n<p>Java \u4e2d\u6709 goto \u5173\u952e\u5b57\u5417&#xff1f;<\/p>\n<ul>\n<li>\u6709\u4fdd\u7559\u5b57 goto&#xff0c;\u4f46\u672a\u5b9e\u73b0\u3002<\/li>\n<li>\u5e26\u6807\u7b7e\u7684 break\/continue \u5b9e\u73b0\u4e86\u7c7b\u4f3c goto \u7684\u529f\u80fd&#xff0c;\u4f46\u4ec5\u9650\u4e8e\u5faa\u73af\u5185\u90e8\u8df3\u8f6c\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 63 \u671f&#xff1a;\u6b7b\u5faa\u73af\u7684\u6982\u5ff5\u4e0e\u5e94\u7528<\/h3>\n<h4>1. \u5b9a\u4e49<\/h4>\n<p>\u6761\u4ef6\u6c38\u8fdc\u4e3a\u771f&#xff0c;\u5faa\u73af\u65e0\u6cd5\u81ea\u7136\u7ed3\u675f\u7684\u5faa\u73af\u3002<\/p>\n<p><span class=\"token keyword\">while<\/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 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 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 punctuation\">.<\/span> <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token keyword\">do<\/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 keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>2. \u662f Bug \u5417&#xff1f;<\/h4>\n<p>\u4e0d\u4e00\u5b9a\u3002\u8bb8\u591a\u7a0b\u5e8f\u9700\u8981\u957f\u671f\u8fd0\u884c&#xff0c;\u6545\u610f\u4f7f\u7528\u6b7b\u5faa\u73af&#xff0c;\u5e76\u5728\u5185\u90e8\u901a\u8fc7 break \u6216 return \u63a7\u5236\u9000\u51fa\u3002<\/p>\n<ul>\n<li>\u5e38\u89c1\u573a\u666f&#xff1a;\u670d\u52a1\u5668\u76d1\u542c\u3001\u6e38\u620f\u4e3b\u5faa\u73af\u3001\u83dc\u5355\u7cfb\u7edf\u3001\u76d1\u63a7\u7a0b\u5e8f\u3002<\/li>\n<\/ul>\n<h4>3. \u610f\u5916\u6b7b\u5faa\u73af\u7684\u539f\u56e0<\/h4>\n<li>\u5fd8\u8bb0\u66f4\u65b0\u5faa\u73af\u53d8\u91cf&#xff08;\u5982\u6f0f\u5199 i&#043;&#043;&#xff09;\u3002<\/li>\n<li>continue \u8df3\u8fc7\u4e86\u66f4\u65b0\u8bed\u53e5\u3002<\/li>\n<li>\u5faa\u73af\u6761\u4ef6\u9519\u8bef&#xff08;\u5982 i &gt; 0 \u5f53 i \u521d\u59cb\u4e3a 0 \u4e14\u9012\u589e\u65f6&#xff09;\u3002<\/li>\n<li>\u6d6e\u70b9\u6570\u6bd4\u8f83&#xff1a;\u4f7f\u7528 !&#061; \u5224\u65ad\u6d6e\u70b9\u6570\u662f\u5426\u8fbe\u5230\u76ee\u6807\u503c&#xff08;\u56e0\u7cbe\u5ea6\u95ee\u9898\u53ef\u80fd\u6c38\u8fdc\u4e0d\u76f8\u7b49&#xff09;\u3002<\/li>\n<h4>4. \u5982\u4f55\u7ec8\u6b62<\/h4>\n<ul>\n<li>\u547d\u4ee4\u884c&#xff1a;Ctrl &#043; C<\/li>\n<li>IDE&#xff1a;\u70b9\u51fb\u505c\u6b62\u6309\u94ae<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 64 \u671f&#xff1a;\u968f\u673a\u6570 Random \u7c7b\u7684\u751f\u6210<\/h3>\n<h4>1. \u57fa\u672c\u7528\u6cd5<\/h4>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><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><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token class-name\">Random<\/span> r <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 keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> r<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u751f\u6210 [0, 10) \u4e4b\u95f4\u7684\u6574\u6570&#xff0c;\u5373 0-9<\/span><\/p>\n<h4>2. \u751f\u6210\u6307\u5b9a\u8303\u56f4 [min, max] \u7684\u968f\u673a\u6574\u6570<\/h4>\n<p>\u901a\u7528\u516c\u5f0f&#xff1a;<\/p>\n<p><span class=\"token keyword\">int<\/span> num <span class=\"token operator\">&#061;<\/span> r<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span>max <span class=\"token operator\">&#8211;<\/span> min <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> min<span class=\"token punctuation\">;<\/span><\/p>\n<ul>\n<li>\u4f8b\u5982&#xff1a;\u751f\u6210 1-100 \u2192 r.nextInt(100) &#043; 1<\/li>\n<li>\u4f8b\u5982&#xff1a;\u751f\u6210 5-15 \u2192 r.nextInt(11) &#043; 5<\/li>\n<\/ul>\n<h4>3. \u5176\u4ed6\u65b9\u6cd5<\/h4>\n<ul>\n<li>nextDouble(): [0.0, 1.0)<\/li>\n<li>nextBoolean(): true \u6216 false<\/li>\n<li>nextInt(): \u4efb\u610f int \u8303\u56f4<\/li>\n<\/ul>\n<h4>4. \u4f2a\u968f\u673a\u6570<\/h4>\n<ul>\n<li>Random \u751f\u6210\u7684\u662f\u4f2a\u968f\u673a\u6570&#xff0c;\u57fa\u4e8e\u79cd\u5b50\u8ba1\u7b97\u3002<\/li>\n<li>\u9ed8\u8ba4\u6784\u9020\u51fd\u6570\u4f7f\u7528\u5f53\u524d\u65f6\u95f4\u4f5c\u4e3a\u79cd\u5b50&#xff0c;\u4fdd\u8bc1\u6bcf\u6b21\u8fd0\u884c\u7ed3\u679c\u4e0d\u540c\u3002<\/li>\n<li>\u82e5\u6307\u5b9a\u79cd\u5b50 new Random(100)&#xff0c;\u5219\u6bcf\u6b21\u751f\u6210\u7684\u5e8f\u5217\u76f8\u540c\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 65 \u671f&#xff1a;Math \u7c7b\u4e2d\u7684\u5e38\u7528\u6570\u5b66\u65b9\u6cd5<\/h3>\n<h4>1. \u7279\u70b9<\/h4>\n<ul>\n<li>\u4f4d\u4e8e java.lang \u5305&#xff0c;\u65e0\u9700\u5bfc\u5305\u3002<\/li>\n<li>\u6240\u6709\u65b9\u6cd5\u5747\u4e3a static&#xff0c;\u76f4\u63a5\u901a\u8fc7 Math.\u65b9\u6cd5\u540d() \u8c03\u7528\u3002<\/li>\n<li>\u7c7b\u672c\u8eab\u662f final&#xff0c;\u4e0d\u53ef\u7ee7\u627f&#xff0c;\u6784\u9020\u79c1\u6709\u3002<\/li>\n<\/ul>\n<h4>2. \u5e38\u7528\u65b9\u6cd5\u8868<\/h4>\n<table>\n<tr>\u65b9\u6cd5\u8bf4\u660e\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">abs(a)<\/td>\n<td align=\"left\">\u7edd\u5bf9\u503c<\/td>\n<td align=\"left\">Math.abs(-5) \u2192 5<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">max(a, b) \/ min(a, b)<\/td>\n<td align=\"left\">\u6700\u5927\u503c\/\u6700\u5c0f\u503c<\/td>\n<td align=\"left\">Math.max(3, 5) \u2192 5<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">pow(a, b)<\/td>\n<td align=\"left\">a \u7684 b \u6b21\u5e42<\/td>\n<td align=\"left\">Math.pow(2, 3) \u2192 8.0<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">sqrt(a)<\/td>\n<td align=\"left\">\u5e73\u65b9\u6839<\/td>\n<td align=\"left\">Math.sqrt(16) \u2192 4.0<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">ceil(a)<\/td>\n<td align=\"left\">\u5411\u4e0a\u53d6\u6574<\/td>\n<td align=\"left\">Math.ceil(3.2) \u2192 4.0<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">floor(a)<\/td>\n<td align=\"left\">\u5411\u4e0b\u53d6\u6574<\/td>\n<td align=\"left\">Math.floor(3.8) \u2192 3.0<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">round(a)<\/td>\n<td align=\"left\">\u56db\u820d\u4e94\u5165<\/td>\n<td align=\"left\">Math.round(3.5) \u2192 4 (long)<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">random()<\/td>\n<td align=\"left\">\u968f\u673a double<\/td>\n<td align=\"left\">[0.0, 1.0)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3. Math.random() vs Random \u7c7b<\/h4>\n<ul>\n<li>Math.random() \u5e95\u5c42\u8c03\u7528 Random&#xff0c;\u4ec5\u8fd4\u56de [0.0, 1.0) \u7684 double\u3002<\/li>\n<li>\u751f\u6210\u6574\u6570\u9700\u624b\u52a8\u8f6c\u6362&#xff1a;(int)(Math.random() * 100) &#043; 1\u3002<\/li>\n<li>\u63a8\u8350\u4f7f\u7528 Random \u7c7b&#xff0c;API \u66f4\u6e05\u6670\u76f4\u89c2\u3002<\/li>\n<\/ul>\n<h4>4. \u5e38\u91cf<\/h4>\n<ul>\n<li>Math.PI: \u5706\u5468\u7387 \u03c0<\/li>\n<li>Math.E: \u81ea\u7136\u5e38\u6570 e<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 66 \u671f&#xff1a;\u6d41\u7a0b\u63a7\u5236\u6848\u4f8b\u2014\u2014\u731c\u6570\u5b57\u6e38\u620f<\/h3>\n<h4>1. \u9700\u6c42<\/h4>\n<ul>\n<li>\u7cfb\u7edf\u751f\u6210 1-100 \u968f\u673a\u6570\u3002<\/li>\n<li>\u7528\u6237\u6709 10 \u6b21\u673a\u4f1a\u731c\u6d4b\u3002<\/li>\n<li>\u63d0\u793a\u201c\u731c\u5927\u4e86\u201d\u3001\u201c\u731c\u5c0f\u4e86\u201d\u3002<\/li>\n<li>\u731c\u5bf9\u80dc\u5229&#xff0c;\u7528\u5b8c\u6b21\u6570\u5931\u8d25\u3002<\/li>\n<li>\u652f\u6301\u4e00\u5c40\u7ed3\u675f\u540e\u9009\u62e9\u662f\u5426\u91cd\u73a9\u3002<\/li>\n<\/ul>\n<h4>2. \u6838\u5fc3\u903b\u8f91\u7ed3\u6784<\/h4>\n<p><span class=\"token comment\">\/\/ \u5916\u5c42&#xff1a;\u63a7\u5236\u662f\u5426\u518d\u73a9\u4e00\u5c40 (do-while)<\/span><br \/>\n<span class=\"token keyword\">do<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u521d\u59cb\u5316\u672c\u8f6e\u6e38\u620f<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> target <span class=\"token operator\">&#061;<\/span> r<span class=\"token punctuation\">.<\/span><span class=\"token function\">nextInt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">100<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">boolean<\/span> win <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5185\u5c42&#xff1a;\u63a7\u5236\u731c\u6d4b\u6b21\u6570 (for)<\/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\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">10<\/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 comment\">\/\/ \u83b7\u53d6\u8f93\u5165<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5224\u65ad\u5927\u5c0f (if-else)<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>guess <span class=\"token operator\">&#061;&#061;<\/span> target<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            win <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u731c\u5bf9&#xff0c;\u8df3\u51fa\u5185\u5c42\u5faa\u73af<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u5224\u65ad\u8f93\u8d62<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token operator\">!<\/span>win<span class=\"token punctuation\">)<\/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;\u5931\u8d25&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token comment\">\/\/ \u8be2\u95ee\u662f\u5426\u91cd\u73a9<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>\u7ee7\u7eed\u6e38\u620f<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<h4>3. \u77e5\u8bc6\u70b9\u7efc\u5408\u8fd0\u7528<\/h4>\n<ul>\n<li>Random: \u751f\u6210\u76ee\u6807\u6570\u3002<\/li>\n<li>Scanner: \u63a5\u6536\u7528\u6237\u8f93\u5165\u3002<\/li>\n<li>for\/while: \u5faa\u73af\u63a7\u5236\u3002<\/li>\n<li>if-else: \u903b\u8f91\u5224\u65ad\u3002<\/li>\n<li>break: \u63d0\u524d\u9000\u51fa\u5faa\u73af\u3002<\/li>\n<li>boolean \u6807\u8bb0\u4f4d: \u8bb0\u5f55\u6e38\u620f\u7ed3\u679c\u72b6\u6001\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 67 \u671f&#xff1a;\u6d41\u7a0b\u63a7\u5236\u6848\u4f8b\u2014\u2014\u5224\u65ad\u95f0\u5e74<\/h3>\n<h4>1. \u95f0\u5e74\u89c4\u5219<\/h4>\n<li>\u80fd\u88ab 4 \u6574\u9664 \u4e14 \u4e0d\u80fd\u88ab 100 \u6574\u9664\u3002<\/li>\n<li>\u6216\u8005 \u80fd\u88ab 400 \u6574\u9664\u3002<\/li>\n<h4>2. \u4ee3\u7801\u5b9e\u73b0<\/h4>\n<p>\u63a8\u8350\u5199\u6cd5&#xff08;\u903b\u8f91\u8868\u8fbe\u5f0f&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">boolean<\/span> isLeap <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>year <span class=\"token operator\">%<\/span> <span class=\"token number\">4<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> year <span class=\"token operator\">%<\/span> <span class=\"token number\">100<\/span> <span class=\"token operator\">!&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">||<\/span> <span class=\"token punctuation\">(<\/span>year <span class=\"token operator\">%<\/span> <span class=\"token number\">400<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u66ff\u4ee3\u5199\u6cd5&#xff08;\u5d4c\u5957 if&#xff09;&#xff1a;<\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>year <span class=\"token operator\">%<\/span> <span class=\"token number\">4<\/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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>year <span class=\"token operator\">%<\/span> <span class=\"token number\">100<\/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 keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>year <span class=\"token operator\">%<\/span> <span class=\"token number\">400<\/span> <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> isLeap <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> isLeap <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        isLeap <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">true<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    isLeap <span class=\"token operator\">&#061;<\/span> <span class=\"token boolean\">false<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u6269\u5c55&#xff1a;\u5224\u65ad\u6708\u4efd\u5929\u6570<\/h4>\n<p>\u7ed3\u5408 switch \u548c\u95f0\u5e74\u5224\u65ad&#xff0c;\u786e\u5b9a\u67d0\u5e74\u67d0\u6708\u7684\u5929\u6570\u3002<\/p>\n<ul>\n<li>1,3,5,7,8,10,12\u6708 \u2192 31\u5929<\/li>\n<li>4,6,9,11\u6708 \u2192 30\u5929<\/li>\n<li>2\u6708 \u2192 \u95f0\u5e7429\u5929&#xff0c;\u5e73\u5e7428\u5929<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 68 \u671f&#xff1a;\u6d41\u7a0b\u63a7\u5236\u6848\u4f8b\u2014\u2014\u6c34\u4ed9\u82b1\u6570<\/h3>\n<h4>1. \u5b9a\u4e49<\/h4>\n<p>\u4e09\u4f4d\u6570\u4e2d&#xff0c;\u5404\u4f4d\u6570\u5b57\u7684\u7acb\u65b9\u548c\u7b49\u4e8e\u5176\u672c\u8eab\u7684\u6570\u3002<\/p>\n<ul>\n<li>\u4f8b&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">153&#061;13&#043;53&#043;33153 &#061; 1^3 &#043; 5^3 &#043; 3^3<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">153<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8974em;vertical-align: -0.0833em\"><\/span><span class=\"mord\"><span class=\"mord\">1<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">3<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8974em;vertical-align: -0.0833em\"><\/span><span class=\"mord\"><span class=\"mord\">5<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">3<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8141em\"><\/span><span class=\"mord\"><span class=\"mord\">3<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">3<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/li>\n<\/ul>\n<h4>2. \u89e3\u9898\u601d\u8def<\/h4>\n<li>\u904d\u5386 100-999\u3002<\/li>\n<li>\u62c6\u5206\u4e2a\u4f4d\u3001\u5341\u4f4d\u3001\u767e\u4f4d\u3002\n<ul>\n<li>\u4e2a\u4f4d&#xff1a;n % 10<\/li>\n<li>\u5341\u4f4d&#xff1a;n \/ 10 % 10<\/li>\n<li>\u767e\u4f4d&#xff1a;n \/ 100<\/li>\n<\/ul>\n<\/li>\n<li>\u8ba1\u7b97\u7acb\u65b9\u548c\u5e76\u6bd4\u8f83\u3002<\/li>\n<h4>3. \u4ee3\u7801\u5b9e\u73b0<\/h4>\n<p><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\">100<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">999<\/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 keyword\">int<\/span> ge <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">%<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> shi <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">\/<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">%<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> bai <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">\/<\/span> <span class=\"token number\">100<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>ge<span class=\"token operator\">*<\/span>ge<span class=\"token operator\">*<\/span>ge <span class=\"token operator\">&#043;<\/span> shi<span class=\"token operator\">*<\/span>shi<span class=\"token operator\">*<\/span>shi <span class=\"token operator\">&#043;<\/span> bai<span class=\"token operator\">*<\/span>bai<span class=\"token operator\">*<\/span>bai <span class=\"token operator\">&#061;&#061;<\/span> i<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>i<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 comment\">\/\/ \u7ed3\u679c&#xff1a;153, 370, 371, 407<\/span><\/p>\n<h4>4. \u6269\u5c55&#xff1a;\u53d6\u4efb\u610f\u4f4d\u6570\u5b57<\/h4>\n<p>\u516c\u5f0f&#xff1a;num \/ (int)Math.pow(10, n) % 10 &#xff08;n \u4ece\u53f3\u5411\u5de6\u7d22\u5f15&#xff0c;0\u5f00\u59cb&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 69 \u671f&#xff1a;\u6d41\u7a0b\u63a7\u5236\u6848\u4f8b\u2014\u2014\u7edf\u8ba1\u4f4d\u6570\u4e0e\u6c42\u548c<\/h3>\n<h4>1. \u9700\u6c42<\/h4>\n<p>\u8f93\u5165\u4e00\u4e2a\u6574\u6570&#xff0c;\u8f93\u51fa&#xff1a;<\/p>\n<li>\u4f4d\u6570<\/li>\n<li>\u5404\u4f4d\u6570\u5b57\u4e4b\u548c<\/li>\n<li>\u9006\u5e8f\u6570<\/li>\n<h4>2. \u6838\u5fc3\u7b97\u6cd5&#xff1a;\u5faa\u73af\u53d6\u4f59<\/h4>\n<p>\u5229\u7528 while \u5faa\u73af&#xff0c;\u6bcf\u6b21\u53d6\u4e2a\u4f4d\u5e76\u9664\u4ee5 10&#xff0c;\u76f4\u5230\u6570\u4e3a 0\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> temp <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Math<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">abs<\/span><span class=\"token punctuation\">(<\/span>num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5904\u7406\u8d1f\u6570\u548c0<\/span><br \/>\n<span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> sum <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> reverse <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>temp <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    count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u7279\u6b8a\u5904\u74060<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>temp <span class=\"token operator\">&gt;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> digit <span class=\"token operator\">&#061;<\/span> temp <span class=\"token operator\">%<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        sum <span class=\"token operator\">&#043;&#061;<\/span> digit<span class=\"token punctuation\">;<\/span><br \/>\n        reverse <span class=\"token operator\">&#061;<\/span> reverse <span class=\"token operator\">*<\/span> <span class=\"token number\">10<\/span> <span class=\"token operator\">&#043;<\/span> digit<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u62fc\u63a5\u9006\u5e8f\u6570<\/span><br \/>\n        temp <span class=\"token operator\">\/&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u6269\u5c55&#xff1a;\u56de\u6587\u6570\u5224\u65ad<\/h4>\n<p>\u82e5 reverse &#061;&#061; Math.abs(num)&#xff0c;\u5219\u4e3a\u56de\u6587\u6570\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 70 \u671f&#xff1a;\u6d41\u7a0b\u63a7\u5236\u6848\u4f8b\u2014\u2014\u6590\u6ce2\u90a3\u5951\u6570\u5217<\/h3>\n<h4>1. \u5b9a\u4e49<\/h4>\n<p>\u6570\u5217&#xff1a;1, 1, 2, 3, 5, 8, 13\u2026<br \/>\n\u89c4\u5f8b&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">F(n)&#061;F(n\u22121)&#043;F(n\u22122)F(n) &#061; F(n-1) &#043; F(n-2)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">F<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">F<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">F<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\">2<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span> (<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">n\u22653n \\\\ge 3<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7719em;vertical-align: -0.136em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">\u2265<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">3<\/span><\/span><\/span><\/span><\/span>)<\/p>\n<h4>2. \u8fed\u4ee3\u6cd5\u5b9e\u73b0&#xff08;\u63a8\u8350&#xff09;<\/h4>\n<p>\u4f7f\u7528\u4e09\u4e2a\u53d8\u91cf\u6eda\u52a8\u66f4\u65b0&#xff0c;\u7a7a\u95f4\u590d\u6742\u5ea6 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(1)O(1)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/p>\n<p><span class=\"token keyword\">int<\/span> n <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/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\">print<\/span><span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034; &#034;<\/span> <span class=\"token operator\">&#043;<\/span> b<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><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\">3<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;&#061;<\/span> n<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 keyword\">int<\/span> c <span class=\"token operator\">&#061;<\/span> a <span class=\"token operator\">&#043;<\/span> b<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\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034; &#034;<\/span> <span class=\"token operator\">&#043;<\/span> c<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    a <span class=\"token operator\">&#061;<\/span> b<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u524d\u79fb<\/span><br \/>\n    b <span class=\"token operator\">&#061;<\/span> c<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u66f4\u65b0\u5f53\u524d<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u5176\u4ed6\u5b9e\u73b0\u65b9\u5f0f<\/h4>\n<ul>\n<li>\u6570\u7ec4\u5b58\u50a8&#xff1a;\u9002\u5408\u9700\u8981\u4fdd\u5b58\u5386\u53f2\u6570\u636e\u7684\u573a\u666f\u3002<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> fib <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span>n<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\nfib<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/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 operator\">&#061;<\/span> <span class=\"token number\">1<\/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\">2<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&lt;<\/span>n<span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> fib<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> fib<span class=\"token punctuation\">[<\/span>i<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#043;<\/span> fib<span class=\"token punctuation\">[<\/span>i<span class=\"token operator\">&#8211;<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<\/li>\n<li>\u9012\u5f52&#xff1a;\u4ee3\u7801\u7b80\u6d01\u4f46\u6548\u7387\u4f4e&#xff08;\u91cd\u590d\u8ba1\u7b97&#xff09;&#xff0c;\u4e0d\u63a8\u8350\u7528\u4e8e\u5927\u6570\u503c\u3002<\/li>\n<\/ul>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u6570\u636e\u6ea2\u51fa&#xff1a;int \u6700\u591a\u652f\u6301\u5230\u7b2c 46 \u9879\u5de6\u53f3&#xff0c;\u66f4\u5927\u9700\u7528 long \u6216 BigInteger\u3002<\/li>\n<li>\u5e94\u7528\u573a\u666f&#xff1a;\u722c\u697c\u68af\u95ee\u9898\u3001\u5154\u5b50\u7e41\u6b96\u3001\u52a8\u6001\u89c4\u5212\u5165\u95e8\u3002<\/li>\n<\/ul>\n<hr \/>\n<p>\u7ed3\u8bed&#xff1a;\u606d\u559c&#xff01;\u4f60\u5df2\u7ecf\u5b8c\u6210\u4e86 Java \u57fa\u7840\u8bed\u6cd5\u4e2d\u6d41\u7a0b\u63a7\u5236\u7684\u6240\u6709\u6838\u5fc3\u5185\u5bb9\u3002\u4ece\u7b80\u5355\u7684\u5206\u652f\u5224\u65ad\u5230\u590d\u6742\u7684\u5faa\u73af\u5d4c\u5957&#xff0c;\u518d\u5230\u7ecf\u5178\u7684\u7b97\u6cd5\u6848\u4f8b&#xff0c;\u4f60\u7684\u903b\u8f91\u601d\u7ef4\u80fd\u529b\u548c\u7f16\u7a0b\u5b9e\u6218\u80fd\u529b\u5f97\u5230\u4e86\u663e\u8457\u63d0\u5347\u3002\u63a5\u4e0b\u6765&#xff0c;\u6211\u4eec\u5c06\u8fdb\u5165\u6570\u636e\u7ed3\u6784\u7684\u57fa\u7840\u2014\u2014\u6570\u7ec4\u7684\u5b66\u4e60\u3002<\/p>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 71-80 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u7cfb\u7edf\u8bb2\u89e3 Java \u6570\u7ec4&#xff08;Array&#xff09;\u3002\u4ece\u4e00\u7ef4\u6570\u7ec4\u7684\u6982\u5ff5\u3001\u5185\u5b58\u6a21\u578b\u3001\u58f0\u660e\u521d\u59cb\u5316\u3001\u904d\u5386\u64cd\u4f5c&#xff0c;\u5230\u5e38\u89c1\u7684\u7b97\u6cd5\u6848\u4f8b&#xff08;\u6700\u5927\u503c\u3001\u6c42\u548c\u3001\u9006\u5e8f&#xff09;&#xff0c;\u518d\u5230\u4e8c\u7ef4\u6570\u7ec4\u7684\u7ed3\u6784\u4e0e\u904d\u5386\u3002\u91cd\u70b9\u89e3\u6790\u6570\u7ec4\u7684\u5e95\u5c42\u539f\u7406\u53ca\u5e38\u89c1\u5f02\u5e38\u5904\u7406\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 71 \u671f&#xff1a;\u6570\u7ec4\u7684\u6982\u5ff5\u4e0e\u5185\u5b58\u5206\u914d\u539f\u7406<\/h3>\n<h4>1. \u4e3a\u4ec0\u4e48\u9700\u8981\u6570\u7ec4<\/h4>\n<ul>\n<li>\u75db\u70b9&#xff1a;\u5b58\u50a8\u5927\u91cf\u76f8\u540c\u7c7b\u578b\u6570\u636e\u65f6&#xff0c;\u5b9a\u4e49\u591a\u4e2a\u53d8\u91cf\u7e41\u7410\u4e14\u96be\u4ee5\u7ba1\u7406&#xff08;\u5982\u6c42\u5e73\u5747\u5206&#xff09;\u3002<\/li>\n<li>\u89e3\u51b3\u65b9\u6848&#xff1a;\u6570\u7ec4\u662f\u4e00\u4e2a\u5bb9\u5668&#xff0c;\u53ef\u4ee5\u4e00\u6b21\u6027\u5b58\u50a8\u591a\u4e2a\u76f8\u540c\u7c7b\u578b\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n<h4>2. \u6570\u7ec4\u7684\u6838\u5fc3\u7279\u70b9<\/h4>\n<ul>\n<li>\u7c7b\u578b\u4e00\u81f4&#xff1a;\u6240\u6709\u5143\u7d20\u5fc5\u987b\u662f\u540c\u4e00\u79cd\u6570\u636e\u7c7b\u578b\u3002<\/li>\n<li>\u957f\u5ea6\u56fa\u5b9a&#xff1a;\u521b\u5efa\u540e\u957f\u5ea6\u4e0d\u53ef\u6539\u53d8\u3002<\/li>\n<li>\u7d22\u5f15\u8bbf\u95ee&#xff1a;\u901a\u8fc7\u4ece 0 \u5f00\u59cb\u7684\u6574\u6570\u7d22\u5f15\u8bbf\u95ee\u5143\u7d20\u3002<\/li>\n<li>\u8fde\u7eed\u5b58\u50a8&#xff1a;\u5728\u5185\u5b58\u4e2d\u5360\u636e\u8fde\u7eed\u7684\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n<h4>3. \u5185\u5b58\u6a21\u578b<\/h4>\n<p>Java \u5185\u5b58\u4e3b\u8981\u5206\u4e3a\u6808&#xff08;Stack&#xff09;\u548c\u5806&#xff08;Heap&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u6808&#xff08;Stack&#xff09;&#xff1a;\u5b58\u50a8\u5c40\u90e8\u53d8\u91cf&#xff08;\u5305\u62ec\u5f15\u7528\u53d8\u91cf\u7684\u5730\u5740&#xff09;\u3002<\/li>\n<li>\u5806&#xff08;Heap&#xff09;&#xff1a;\u5b58\u50a8 new \u51fa\u6765\u7684\u5bf9\u8c61&#xff08;\u5305\u62ec\u6570\u7ec4\u5bf9\u8c61\u672c\u8eab&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u5f15\u7528\u7c7b\u578b\u673a\u5236&#xff1a;<\/p>\n<ul>\n<li>\u6570\u7ec4\u53d8\u91cf&#xff08;\u5982 int[] arr&#xff09;\u5b58\u50a8\u5728\u6808\u4e2d&#xff0c;\u4fdd\u5b58\u7684\u662f\u6307\u5411\u5806\u4e2d\u6570\u7ec4\u5bf9\u8c61\u7684\u5730\u5740\u3002<\/li>\n<li>\u6570\u7ec4\u7684\u5b9e\u9645\u5143\u7d20\u6570\u636e\u5b58\u50a8\u5728\u5806\u4e2d\u3002<\/li>\n<\/ul>\n<p>\u6808\u5185\u5b58                    \u5806\u5185\u5b58<br \/>\n&#043;&#8212;&#8212;&#043;               &#043;&#8212;&#8212;&#8212;&#8211;&#043;<br \/>\n| arr  | &#8212;&#8212;&#8212;&#8211;&gt; |  int[5]   |<br \/>\n&#043;&#8212;&#8212;&#043;               &#043;&#8212;&#8212;&#8212;&#8211;&#043;<br \/>\n(\u5730\u5740)               | 0: 90     |<br \/>\n                     | 1: 85     |<br \/>\n                     | &#8230;       |<br \/>\n                     &#043;&#8212;&#8212;&#8212;&#8211;&#043;<\/p>\n<h4>4. \u9ed8\u8ba4\u521d\u59cb\u5316\u503c<\/h4>\n<table>\n<tr>\u6570\u636e\u7c7b\u578b\u9ed8\u8ba4\u503c<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u6574\u6570 (byte, short, int, long)<\/td>\n<td align=\"left\">0<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u6d6e\u70b9\u6570 (float, double)<\/td>\n<td align=\"left\">0.0<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5b57\u7b26 (char)<\/td>\n<td align=\"left\">&#039;\\\\u0000&#039;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5e03\u5c14 (boolean)<\/td>\n<td align=\"left\">false<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u5f15\u7528\u7c7b\u578b (String, \u5bf9\u8c61\u7b49)<\/td>\n<td align=\"left\">null<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u7b2c 72 \u671f&#xff1a;\u4e00\u7ef4\u6570\u7ec4\u7684\u58f0\u660e\u4e0e\u52a8\u6001\u521d\u59cb\u5316<\/h3>\n<h4>1. \u6570\u7ec4\u58f0\u660e<\/h4>\n<p>\u63a8\u8350\u5199\u6cd5&#xff1a;\u6570\u636e\u7c7b\u578b[] \u6570\u7ec4\u540d;<\/p>\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u58f0\u660e\u65f6\u4e0d\u80fd\u6307\u5b9a\u957f\u5ea6\u3002<\/li>\n<\/ul>\n<h4>2. \u52a8\u6001\u521d\u59cb\u5316<\/h4>\n<p>\u53ea\u6307\u5b9a\u957f\u5ea6&#xff0c;\u7531\u7cfb\u7edf\u8d4b\u4e88\u9ed8\u8ba4\u503c\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u683c\u5f0f&#xff1a;new \u6570\u636e\u7c7b\u578b[\u957f\u5ea6]<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<h4>3. \u6570\u7ec4\u8bbf\u95ee\u4e0e\u957f\u5ea6<\/h4>\n<ul>\n<li>\u8bbf\u95ee\u5143\u7d20&#xff1a;\u6570\u7ec4\u540d[\u7d22\u5f15]\u3002\u7d22\u5f15\u8303\u56f4&#xff1a;0 \u5230 length &#8211; 1\u3002<\/li>\n<li>\u83b7\u53d6\u957f\u5ea6&#xff1a;\u6570\u7ec4\u540d.length\u3002\n<ul>\n<li>\u91cd\u8981\u533a\u522b&#xff1a;length \u662f\u5c5e\u6027&#xff08;\u65e0\u62ec\u53f7&#xff09;&#xff0c;String \u7684 length() \u662f\u65b9\u6cd5&#xff08;\u6709\u62ec\u53f7&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>4. \u6570\u7ec4\u904d\u5386<\/h4>\n<p>\u4f7f\u7528 for \u5faa\u73af&#xff0c;\u7d22\u5f15\u4ece 0 \u904d\u5386\u81f3 arr.length &#8211; 1\u3002<\/p>\n<p><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> arr<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    <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>arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>5. \u5e38\u89c1\u9519\u8bef<\/h4>\n<ul>\n<li>ArrayIndexOutOfBoundsException&#xff1a;\u7d22\u5f15\u8d8a\u754c&#xff08;\u8bbf\u95ee\u4e86 &lt;0 \u6216 &gt;&#061;length \u7684\u7d22\u5f15&#xff09;\u3002<\/li>\n<li>NullPointerException&#xff1a;\u6570\u7ec4\u53d8\u91cf\u4e3a null \u65f6\u8bbf\u95ee\u5143\u7d20\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 73 \u671f&#xff1a;\u4e00\u7ef4\u6570\u7ec4\u7684\u9759\u6001\u521d\u59cb\u5316<\/h3>\n<h4>1. \u9759\u6001\u521d\u59cb\u5316<\/h4>\n<p>\u521b\u5efa\u6570\u7ec4\u65f6\u76f4\u63a5\u6307\u5b9a\u5177\u4f53\u5143\u7d20\u503c&#xff0c;\u7cfb\u7edf\u81ea\u52a8\u8ba1\u7b97\u957f\u5ea6\u3002<\/p>\n<h4>2. \u4e24\u79cd\u683c\u5f0f<\/h4>\n<ul>\n<li>\u6807\u51c6\u683c\u5f0f&#xff1a;<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/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\">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<li>\u7b80\u5316\u683c\u5f0f&#xff08;\u63a8\u8350&#xff09;&#xff1a;<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <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 punctuation\">;<\/span>\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u7b80\u5316\u683c\u5f0f\u53ea\u80fd\u5728\u58f0\u660e\u540c\u65f6\u4f7f\u7528&#xff0c;\u4e0d\u80fd\u7528\u4e8e\u540e\u7eed\u8d4b\u503c&#xff08;\u5982 arr &#061; {1,2} \u662f\u9519\u8bef\u7684&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>3. \u52a8\u6001 vs \u9759\u6001\u9009\u62e9<\/h4>\n<ul>\n<li>\u77e5\u9053\u5143\u7d20\u5185\u5bb9 \u2192 \u7528\u9759\u6001\u521d\u59cb\u5316\u3002<\/li>\n<li>\u53ea\u77e5\u9053\u957f\u5ea6&#xff0c;\u5185\u5bb9\u672a\u77e5\u6216\u540e\u7eed\u751f\u6210 \u2192 \u7528\u52a8\u6001\u521d\u59cb\u5316\u3002<\/li>\n<\/ul>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u6570\u7ec4\u4e00\u65e6\u521b\u5efa&#xff0c;\u957f\u5ea6\u4e0d\u53ef\u53d8\u3002<\/li>\n<li>\u76f4\u63a5\u6253\u5370\u6570\u7ec4\u5bf9\u8c61\u8f93\u51fa\u7684\u662f\u54c8\u5e0c\u5730\u5740&#xff08;\u5982 [I&#064;1b6d3586&#xff09;&#xff0c;\u9700\u904d\u5386\u6216\u4f7f\u7528 Arrays.toString() \u67e5\u770b\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 74 \u671f&#xff1a;\u6570\u7ec4\u7684\u904d\u5386\u4e0e length \u5c5e\u6027<\/h3>\n<h4>1. \u4e24\u79cd\u904d\u5386\u65b9\u5f0f\u5bf9\u6bd4<\/h4>\n<table>\n<tr>\u7279\u6027\u666e\u901a for \u5faa\u73af\u589e\u5f3a for \u5faa\u73af (foreach)<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u8bed\u6cd5<\/td>\n<td align=\"left\">for(int i&#061;0; i&lt;arr.length; i&#043;&#043;)<\/td>\n<td align=\"left\">for(type var : arr)<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u662f\u5426\u6709\u7d22\u5f15<\/td>\n<td align=\"left\">\u6709 (i)<\/td>\n<td align=\"left\">\u65e0<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u80fd\u5426\u4fee\u6539\u5143\u7d20<\/td>\n<td align=\"left\">\u80fd (arr[i] &#061; val)<\/td>\n<td align=\"left\">\u4e0d\u80fd (\u4fee\u6539\u53d8\u91cf\u526f\u672c\u4e0d\u5f71\u54cd\u539f\u6570\u7ec4)<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">\u9002\u7528\u573a\u666f<\/td>\n<td align=\"left\">\u9700\u8981\u7d22\u5f15\u3001\u4fee\u6539\u5143\u7d20\u3001\u67e5\u627e\u4f4d\u7f6e<\/td>\n<td align=\"left\">\u4ec5\u8bfb\u53d6\u5143\u7d20\u3001\u7b80\u5355\u904d\u5386<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2. \u5178\u578b\u5e94\u7528<\/h4>\n<ul>\n<li>\u6c42\u548c&#xff1a;\u7d2f\u52a0\u6240\u6709\u5143\u7d20\u3002<\/li>\n<li>\u6c42\u5e73\u5747\u503c&#xff1a;sum \/ length\u3002\n<ul>\n<li>\u9677\u9631&#xff1a;\u6ce8\u610f\u6574\u6570\u9664\u6cd5\u7cbe\u5ea6\u4e22\u5931&#xff0c;\u5efa\u8bae\u5148\u8f6c\u6362\u4e3a double&#xff1a;(double) sum \/ length\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>3. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u7a7a\u6570\u7ec4 (length&#061;0) \u904d\u5386\u65f6\u5faa\u73af\u4f53\u4e0d\u6267\u884c&#xff0c;\u5b89\u5168\u3002<\/li>\n<li>null \u6570\u7ec4\u904d\u5386\u65f6\u4f1a\u62a5 NullPointerException\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 75 \u671f&#xff1a;\u6570\u7ec4\u7684\u6700\u5c0f\u503c\u4e0e\u6700\u5927\u503c\u83b7\u53d6<\/h3>\n<h4>1. \u6838\u5fc3\u601d\u8def&#xff08;\u64c2\u53f0\u6cd5&#xff09;<\/h4>\n<li>\u5047\u8bbe\u7b2c\u4e00\u4e2a\u5143\u7d20\u4e3a\u6700\u5927\u503c\/\u6700\u5c0f\u503c (max &#061; arr[0])\u3002<\/li>\n<li>\u4ece\u7b2c\u4e8c\u4e2a\u5143\u7d20\u5f00\u59cb\u904d\u5386\u3002<\/li>\n<li>\u82e5\u5f53\u524d\u5143\u7d20\u5927\u4e8e max&#xff0c;\u5219\u66f4\u65b0 max\u3002<\/li>\n<h4>2. \u5173\u952e\u7ec6\u8282<\/h4>\n<ul>\n<li>\u521d\u59cb\u503c\u5fc5\u987b\u6765\u81ea\u6570\u7ec4&#xff1a;\u4e0d\u80fd\u8bbe\u4e3a 0&#xff0c;\u5426\u5219\u5168\u8d1f\u6570\u6570\u7ec4\u7ed3\u679c\u9519\u8bef\u3002<\/li>\n<li>\u8d77\u59cb\u7d22\u5f15&#xff1a;\u4ece 1 \u5f00\u59cb\u6bd4\u8f83&#xff08;\u56e0\u4e3a 0 \u5df2\u4f5c\u4e3a\u521d\u59cb\u503c&#xff09;\u3002<\/li>\n<li>\u540c\u65f6\u6c42\u6700\u503c&#xff1a;\u5728\u4e00\u6b21\u904d\u5386\u4e2d\u540c\u65f6\u66f4\u65b0 max \u548c min&#xff0c;\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<\/ul>\n<h4>3. \u83b7\u53d6\u6700\u503c\u7684\u7d22\u5f15<\/h4>\n<p>\u8bb0\u5f55\u6700\u5927\/\u6700\u5c0f\u503c\u7684\u7d22\u5f15 index&#xff0c;\u5f53\u53d1\u73b0\u66f4\u4f18\u503c\u65f6\u66f4\u65b0 index\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 76 \u671f&#xff1a;\u6570\u7ec4\u5143\u7d20\u7684\u6c42\u548c\u4e0e\u5e73\u5747\u503c<\/h3>\n<h4>1. \u6c42\u548c\u4e0e\u5e73\u5747\u503c\u4ee3\u7801\u6a21\u677f<\/h4>\n<p><span class=\"token keyword\">int<\/span> sum <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\">int<\/span> num <span class=\"token operator\">:<\/span> arr<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    sum <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\">double<\/span> avg <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">double<\/span><span class=\"token punctuation\">)<\/span> sum <span class=\"token operator\">\/<\/span> arr<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5f3a\u5236\u8f6c\u6362\u9632\u6b62\u6574\u6570\u622a\u65ad<\/span><\/p>\n<h4>2. \u8fdb\u9636\u7edf\u8ba1<\/h4>\n<ul>\n<li>\u5355\u6b21\u904d\u5386&#xff1a;\u53ef\u540c\u65f6\u8ba1\u7b97\u603b\u548c\u3001\u6700\u5927\u503c\u3001\u6700\u5c0f\u503c\u3002<\/li>\n<li>\u591a\u6b21\u904d\u5386&#xff1a;\u82e5\u9700\u7edf\u8ba1\u201c\u5927\u4e8e\u5e73\u5747\u503c\u7684\u4e2a\u6570\u201d&#xff0c;\u9700\u5148\u7b97\u51fa\u5e73\u5747\u503c&#xff0c;\u518d\u4e8c\u6b21\u904d\u5386\u7edf\u8ba1\u3002<\/li>\n<\/ul>\n<h4>3. \u6ea2\u51fa\u98ce\u9669<\/h4>\n<ul>\n<li>\u82e5\u6570\u7ec4\u5143\u7d20\u5f88\u5927\u6216\u6570\u91cf\u5f88\u591a&#xff0c;sum \u53ef\u80fd\u8d85\u51fa int \u8303\u56f4&#xff0c;\u5efa\u8bae\u4f7f\u7528 long \u6216 double \u5b58\u50a8\u7d2f\u52a0\u548c\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 77 \u671f&#xff1a;\u6570\u7ec4\u7684\u9006\u5e8f\u64cd\u4f5c<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<ul>\n<li>\u9006\u5e8f&#xff1a;\u4fee\u6539\u539f\u6570\u7ec4&#xff0c;\u4f7f\u5143\u7d20\u987a\u5e8f\u98a0\u5012&#xff08;\u539f\u5730\u4ea4\u6362&#xff09;\u3002<\/li>\n<li>\u5012\u7740\u6253\u5370&#xff1a;\u4ec5\u6539\u53d8\u8f93\u51fa\u987a\u5e8f&#xff0c;\u4e0d\u4fee\u6539\u539f\u6570\u7ec4\u3002<\/li>\n<\/ul>\n<h4>2. \u5b9e\u73b0\u903b\u8f91<\/h4>\n<p>\u9996\u5c3e\u4ea4\u6362&#xff1a;\u7d22\u5f15 i \u4e0e length &#8211; 1 &#8211; i \u4ea4\u6362\u3002<br \/>\n\u53ea\u9700\u904d\u5386\u5230 length \/ 2\u3002<\/p>\n<h4>3. \u4ee3\u7801\u5b9e\u73b0<\/h4>\n<p>\u65b9\u6cd5\u4e00&#xff1a;For \u5faa\u73af<\/p>\n<p><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> arr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">\/<\/span> <span class=\"token number\">2<\/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 keyword\">int<\/span> temp <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>arr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#8211;<\/span> i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    arr<span class=\"token punctuation\">[<\/span>arr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#8211;<\/span> i<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> temp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u65b9\u6cd5\u4e8c&#xff1a;\u53cc\u6307\u9488 While \u5faa\u73af<\/p>\n<p><span class=\"token keyword\">int<\/span> left <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">int<\/span> right <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>left <span class=\"token operator\">&lt;<\/span> right<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> temp <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>left<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    arr<span class=\"token punctuation\">[<\/span>left<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>right<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    arr<span class=\"token punctuation\">[<\/span>right<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> temp<span class=\"token punctuation\">;<\/span><br \/>\n    left<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    right<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<h3>\u7b2c 78 \u671f&#xff1a;\u6570\u7ec4\u7684\u62f7\u8d1d\u4e0e\u6269\u5bb9<\/h3>\n<h4>1. \u4e3a\u4ec0\u4e48\u9700\u8981\u6269\u5bb9<\/h4>\n<p>\u6570\u7ec4\u957f\u5ea6\u56fa\u5b9a\u3002\u82e5\u9700\u589e\u52a0\u5bb9\u91cf&#xff0c;\u9700\u65b0\u5efa\u66f4\u5927\u6570\u7ec4\u5e76\u62f7\u8d1d\u6570\u636e\u3002<\/p>\n<h4>2. \u56db\u79cd\u62f7\u8d1d\u65b9\u5f0f<\/h4>\n<li>\u624b\u52a8\u5faa\u73af&#xff1a;\u7075\u6d3b\u4f46\u7e41\u7410\u3002<\/li>\n<li>System.arraycopy()&#xff1a;\u539f\u751f\u65b9\u6cd5&#xff0c;\u6548\u7387\u9ad8&#xff0c;\u53c2\u6570\u591a&#xff08;\u6e90\u6570\u7ec4\u3001\u6e90\u8d77\u59cb\u4f4d\u3001\u76ee\u6807\u6570\u7ec4\u3001\u76ee\u6807\u8d77\u59cb\u4f4d\u3001\u62f7\u8d1d\u957f\u5ea6&#xff09;\u3002<\/li>\n<li>Arrays.copyOf()&#xff1a;\u6700\u65b9\u4fbf&#xff0c;\u8fd4\u56de\u65b0\u6570\u7ec4\u3002\u5e38\u7528\u4e8e\u6269\u5bb9\u3002arr <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Arrays<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">copyOf<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">,<\/span> arr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">*<\/span> <span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6269\u5bb9\u4e00\u500d<\/span>\n<\/li>\n<li>clone()&#xff1a;\u6700\u7b80\u5355&#xff0c;\u590d\u5236\u6574\u4e2a\u6570\u7ec4\u3002<\/li>\n<h4>3. \u6269\u5bb9\u7b56\u7565<\/h4>\n<p>\u901a\u5e38\u6309\u500d\u6570\u6269\u5bb9&#xff08;\u5982 1.5 \u500d\u6216 2 \u500d&#xff09;&#xff0c;\u4ee5\u51cf\u5c11\u9891\u7e41\u6269\u5bb9\u5e26\u6765\u7684\u6027\u80fd\u5f00\u9500&#xff08;\u65f6\u95f4\u6362\u7a7a\u95f4&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 79 \u671f&#xff1a;\u6570\u7ec4\u7684\u5e38\u89c1\u5f02\u5e38<\/h3>\n<h4>1. ArrayIndexOutOfBoundsException (\u7d22\u5f15\u8d8a\u754c)<\/h4>\n<ul>\n<li>\u539f\u56e0&#xff1a;\u8bbf\u95ee\u7d22\u5f15 &lt; 0 \u6216 &gt;&#061; length\u3002<\/li>\n<li>\u5e38\u89c1\u573a\u666f&#xff1a;\u5faa\u73af\u6761\u4ef6\u5199\u9519 (&lt;&#061;)\u3001\u7d22\u5f15\u8ba1\u7b97\u9519\u8bef\u3002<\/li>\n<li>\u9884\u9632&#xff1a;\u575a\u6301\u4f7f\u7528 i &lt; arr.length\u3002<\/li>\n<\/ul>\n<h4>2. NullPointerException (\u7a7a\u6307\u9488)<\/h4>\n<ul>\n<li>\u539f\u56e0&#xff1a;\u6570\u7ec4\u53d8\u91cf\u4e3a null \u65f6\u8bbf\u95ee\u5c5e\u6027\u6216\u65b9\u6cd5\u3002<\/li>\n<li>\u5e38\u89c1\u573a\u666f&#xff1a;\u53ea\u58f0\u660e\u672a\u521d\u59cb\u5316\u3001\u624b\u52a8\u8d4b\u503c\u4e3a null\u3001\u5f15\u7528\u7c7b\u578b\u6570\u7ec4\u5143\u7d20\u9ed8\u8ba4\u4e3a null\u3002<\/li>\n<li>\u9884\u9632&#xff1a;\u4f7f\u7528\u524d\u68c0\u67e5 if (arr !&#061; null)&#xff1b;\u5f15\u7528\u7c7b\u578b\u6570\u7ec4\u5143\u7d20\u4f7f\u7528\u524d\u9700\u786e\u8ba4\u975e null\u3002<\/li>\n<\/ul>\n<h4>3. \u8c03\u8bd5\u6280\u5de7<\/h4>\n<p>\u5b66\u4f1a\u9605\u8bfb\u5f02\u5e38\u5806\u6808\u4fe1\u606f&#xff0c;\u5b9a\u4f4d\u62a5\u9519\u884c\u6570\u548c\u5177\u4f53\u539f\u56e0\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 80 \u671f&#xff1a;\u4e8c\u7ef4\u6570\u7ec4\u7684\u7406\u89e3\u4e0e\u5185\u5b58\u7ed3\u6784<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<ul>\n<li>\u5b9a\u4e49&#xff1a;\u6570\u7ec4\u7684\u6570\u7ec4\u3002<\/li>\n<li>\u7ed3\u6784&#xff1a;\u50cf\u8868\u683c\u4e00\u6837&#xff0c;\u6709\u884c&#xff08;Row&#xff09;\u548c\u5217&#xff08;Column&#xff09;\u3002<\/li>\n<li>\u672c\u8d28&#xff1a;Java \u4e2d\u6ca1\u6709\u771f\u6b63\u7684\u591a\u7ef4\u6570\u7ec4&#xff0c;\u4e8c\u7ef4\u6570\u7ec4\u662f\u4e00\u4e2a\u4e00\u7ef4\u6570\u7ec4&#xff0c;\u5176\u6bcf\u4e2a\u5143\u7d20\u53c8\u662f\u4e00\u4e2a\u4e00\u7ef4\u6570\u7ec4\u7684\u5f15\u7528\u3002<\/li>\n<\/ul>\n<h4>2. \u5185\u5b58\u7ed3\u6784<\/h4>\n<ul>\n<li>\u5916\u5c42\u6570\u7ec4&#xff08;\u884c&#xff09;\u5b58\u50a8\u5728\u5806\u4e2d&#xff0c;\u5176\u5143\u7d20\u5b58\u50a8\u7684\u662f\u5185\u5c42\u6570\u7ec4&#xff08;\u5217&#xff09;\u7684\u5730\u5740\u3002<\/li>\n<li>\u652f\u6301\u4e0d\u89c4\u5219\u6570\u7ec4&#xff08;\u952f\u9f7f\u6570\u7ec4&#xff09;&#xff0c;\u5373\u6bcf\u884c\u7684\u957f\u5ea6\u53ef\u4ee5\u4e0d\u540c\u3002<\/li>\n<\/ul>\n<h4>3. \u58f0\u660e\u4e0e\u521d\u59cb\u5316<\/h4>\n<ul>\n<li>\u89c4\u5219\u4e8c\u7ef4\u6570\u7ec4&#xff1a;int[][] arr &#061; new int[3][5]; (3\u884c5\u5217)<\/li>\n<li>\u4e0d\u89c4\u5219\u4e8c\u7ef4\u6570\u7ec4&#xff1a;<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/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 punctuation\">]<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6307\u5b9a\u884c\u6570<\/span><br \/>\narr<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/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 comment\">\/\/ \u7b2c\u4e00\u884c3\u4e2a\u5143\u7d20<\/span><br \/>\narr<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ \u7b2c\u4e8c\u884c5\u4e2a\u5143\u7d20<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>4. \u8bbf\u95ee\u4e0e\u904d\u5386<\/h4>\n<ul>\n<li>\u8bbf\u95ee&#xff1a;arr[\u884c\u7d22\u5f15][\u5217\u7d22\u5f15]\u3002<\/li>\n<li>\u957f\u5ea6&#xff1a;\n<ul>\n<li>arr.length&#xff1a;\u884c\u6570\u3002<\/li>\n<li>arr[i].length&#xff1a;\u7b2c i \u884c\u7684\u5217\u6570\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u904d\u5386&#xff1a;\u53cc\u91cd\u5faa\u73af\u3002\n<ul>\n<li>\u5916\u5c42\u5faa\u73af\u63a7\u5236\u884c (i &lt; arr.length)\u3002<\/li>\n<li>\u5185\u5c42\u5faa\u73af\u63a7\u5236\u5217 (j &lt; arr[i].length)\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><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> arr<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    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/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\">print<\/span><span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <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><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><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<hr \/>\n<p>\u7ed3\u8bed&#xff1a;\u606d\u559c&#xff01;\u4f60\u5df2\u7ecf\u638c\u63e1\u4e86 Java \u4e2d\u6700\u91cd\u8981\u7684\u6570\u636e\u7ed3\u6784\u4e4b\u4e00\u2014\u2014\u6570\u7ec4\u3002\u4ece\u4e00\u7ef4\u5230\u4e8c\u7ef4&#xff0c;\u4ece\u57fa\u7840\u64cd\u4f5c\u5230\u5185\u5b58\u539f\u7406&#xff0c;\u8fd9\u4e9b\u77e5\u8bc6\u662f\u540e\u7eed\u5b66\u4e60\u96c6\u5408\u6846\u67b6&#xff08;Collection&#xff09;\u548c\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u57fa\u77f3\u3002\u63a5\u4e0b\u6765&#xff0c;\u6211\u4eec\u5c06\u8fdb\u5165\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b (OOP) \u7684\u4e16\u754c&#xff0c;\u63a2\u7d22\u7c7b\u4e0e\u5bf9\u8c61\u7684\u6838\u5fc3\u6982\u5ff5\u3002<\/p>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 81-90 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u6df1\u5165\u8bb2\u89e3\u4e8c\u7ef4\u6570\u7ec4\u53ca\u5176\u64cd\u4f5c&#xff0c;\u4ecb\u7ecd Arrays \u5de5\u5177\u7c7b\u4e0e\u7ecf\u5178\u7b97\u6cd5&#xff08;\u4e8c\u5206\u67e5\u627e\u3001\u5192\u6ce1\/\u9009\u62e9\/\u63d2\u5165\u6392\u5e8f&#xff09;&#xff0c;\u5e76\u901a\u8fc7\u7efc\u5408\u6848\u4f8b&#xff08;\u62bd\u5956\u7cfb\u7edf\u3001\u6210\u7ee9\u7ba1\u7406\u7cfb\u7edf&#xff09;\u5de9\u56fa\u6570\u7ec4\u5e94\u7528\u3002\u6700\u540e\u5f15\u5165\u201c\u65b9\u6cd5\u201d\u6982\u5ff5&#xff0c;\u8be6\u89e3\u65b9\u6cd5\u7684\u5b9a\u4e49\u3001\u8c03\u7528\u53ca\u53c2\u6570\u4f20\u9012\u673a\u5236&#xff08;\u503c\u4f20\u9012&#xff09;\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 81 \u671f&#xff1a;\u4e8c\u7ef4\u6570\u7ec4\u7684\u521d\u59cb\u5316\u4e0e\u904d\u5386<\/h3>\n<h4>1. \u9759\u6001\u521d\u59cb\u5316<\/h4>\n<p>\u76f4\u63a5\u6307\u5b9a\u5143\u7d20\u503c&#xff0c;\u652f\u6301\u89c4\u5219\u548c\u4e0d\u89c4\u5219&#xff08;\u952f\u9f7f&#xff09;\u6570\u7ec4\u3002<\/p>\n<p><span class=\"token comment\">\/\/ \u6807\u51c6\u683c\u5f0f<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/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 punctuation\">]<\/span><span class=\"token punctuation\">{<\/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 punctuation\">,<\/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><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u7b80\u5316\u683c\u5f0f&#xff08;\u63a8\u8350&#xff09;<\/span><br \/>\n<span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> arr <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/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 punctuation\">,<\/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><span class=\"token punctuation\">;<\/span><\/p>\n<h4>2. \u904d\u5386<\/h4>\n<ul>\n<li>\u666e\u901a For \u5faa\u73af&#xff1a;\u9700\u4e24\u5c42\u5faa\u73af&#xff0c;\u5916\u5c42\u63a7\u5236\u884c&#xff0c;\u5185\u5c42\u63a7\u5236\u5217\u3002\u6ce8\u610f\u4f7f\u7528 arr[i].length \u83b7\u53d6\u6bcf\u884c\u957f\u5ea6\u3002<\/li>\n<li>\u589e\u5f3a For \u5faa\u73af&#xff1a;\u66f4\u7b80\u6d01\u3002<span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> row <span class=\"token operator\">:<\/span> arr<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> num <span class=\"token operator\">:<\/span> row<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\">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><br \/>\n    <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><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<\/li>\n<\/ul>\n<h4>3. \u7ecf\u5178\u6848\u4f8b&#xff1a;\u6768\u8f89\u4e09\u89d2<\/h4>\n<ul>\n<li>\u89c4\u5f8b&#xff1a;\u6bcf\u884c\u9996\u5c3e\u4e3a 1&#xff1b;\u4e2d\u95f4\u5143\u7d20 arr[i][j] &#061; arr[i-1][j-1] &#043; arr[i-1][j]\u3002<\/li>\n<li>\u5b9e\u73b0&#xff1a;\u5148\u52a8\u6001\u521b\u5efa\u6bcf\u4e00\u884c\u7684\u6570\u7ec4&#xff08;\u957f\u5ea6\u4e3a i&#043;1&#xff09;&#xff0c;\u586b\u5145\u6570\u636e\u540e\u6253\u5370\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 82 \u671f&#xff1a;Arrays \u5de5\u5177\u7c7b\u5e38\u7528\u65b9\u6cd5<\/h3>\n<p>java.util.Arrays \u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6570\u7ec4\u64cd\u4f5c\u9759\u6001\u65b9\u6cd5\u3002<\/p>\n<table>\n<tr>\u65b9\u6cd5\u8bf4\u660e\u793a\u4f8b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">toString(arr)<\/td>\n<td align=\"left\">\u8f6c\u5b57\u7b26\u4e32&#xff0c;\u65b9\u4fbf\u6253\u5370\u4e00\u7ef4\u6570\u7ec4<\/td>\n<td align=\"left\">[1, 2, 3]<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">deepToString(arr)<\/td>\n<td align=\"left\">\u8f6c\u5b57\u7b26\u4e32&#xff0c;\u7528\u4e8e\u591a\u7ef4\u6570\u7ec4<\/td>\n<td align=\"left\">[[1, 2], [3, 4]]<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">sort(arr)<\/td>\n<td align=\"left\">\u5347\u5e8f\u6392\u5e8f<\/td>\n<td align=\"left\">Arrays.sort(arr)<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">binarySearch(arr, key)<\/td>\n<td align=\"left\">\u4e8c\u5206\u67e5\u627e&#xff08;\u6570\u7ec4\u5fc5\u987b\u6709\u5e8f&#xff09;<\/td>\n<td align=\"left\">\u8fd4\u56de\u7d22\u5f15\u6216\u8d1f\u6570<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">copyOf(arr, len)<\/td>\n<td align=\"left\">\u590d\u5236\u6570\u7ec4&#xff0c;\u53ef\u6307\u5b9a\u65b0\u957f\u5ea6<\/td>\n<td align=\"left\">\u77ed\u5219\u622a\u65ad&#xff0c;\u957f\u5219\u8865\u9ed8\u8ba4\u503c<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">fill(arr, val)<\/td>\n<td align=\"left\">\u586b\u5145\u6570\u7ec4\u6240\u6709\u5143\u7d20<\/td>\n<td align=\"left\">Arrays.fill(arr, 0)<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">equals(a1, a2)<\/td>\n<td align=\"left\">\u6bd4\u8f83\u5185\u5bb9\u662f\u5426\u76f8\u540c<\/td>\n<td align=\"left\">true\/false<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u7b2c 83 \u671f&#xff1a;\u4e8c\u5206\u67e5\u627e\u7b97\u6cd5\u5b9e\u73b0<\/h3>\n<h4>1. \u524d\u63d0\u6761\u4ef6<\/h4>\n<ul>\n<li>\u6570\u7ec4\u5fc5\u987b\u662f\u6709\u5e8f\u7684\u3002<\/li>\n<\/ul>\n<h4>2. \u6838\u5fc3\u903b\u8f91<\/h4>\n<li>\u5b9a\u4e49\u5de6\u8fb9\u754c left &#061; 0&#xff0c;\u53f3\u8fb9\u754c right &#061; length &#8211; 1\u3002<\/li>\n<li>\u5f53 left &lt;&#061; right \u65f6\u5faa\u73af&#xff1a;\n<ul>\n<li>\u8ba1\u7b97\u4e2d\u70b9 mid &#061; left &#043; (right &#8211; left) \/ 2&#xff08;\u9632\u6b62\u6ea2\u51fa&#xff09;\u3002<\/li>\n<li>\u82e5 arr[mid] &#061;&#061; target&#xff0c;\u8fd4\u56de mid\u3002<\/li>\n<li>\u82e5 arr[mid] &lt; target&#xff0c;\u8bf4\u660e\u76ee\u6807\u5728\u53f3\u4fa7&#xff0c;left &#061; mid &#043; 1\u3002<\/li>\n<li>\u82e5 arr[mid] &gt; target&#xff0c;\u8bf4\u660e\u76ee\u6807\u5728\u5de6\u4fa7&#xff0c;right &#061; mid &#8211; 1\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u5faa\u73af\u7ed3\u675f\u672a\u627e\u5230&#xff0c;\u8fd4\u56de -1\u3002<\/li>\n<h4>3. \u590d\u6742\u5ea6<\/h4>\n<ul>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(log\u2061n)O(\\\\log n)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mop\">lo<span style=\"margin-right: 0.0139em\">g<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u6548\u7387\u6781\u9ad8\u3002<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(1)O(1)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 84 \u671f&#xff1a;\u5192\u6ce1\u6392\u5e8f\u7b97\u6cd5\u8be6\u89e3<\/h3>\n<h4>1. \u601d\u8def<\/h4>\n<p>\u91cd\u590d\u904d\u5386\u6570\u7ec4&#xff0c;\u6bd4\u8f83\u76f8\u90bb\u5143\u7d20&#xff0c;\u82e5\u987a\u5e8f\u9519\u8bef\u5219\u4ea4\u6362\u3002\u6bcf\u4e00\u8f6e\u5c06\u6700\u5927\u5143\u7d20\u201c\u5192\u6ce1\u201d\u81f3\u672b\u5c3e\u3002<\/p>\n<h4>2. \u4ee3\u7801\u7ed3\u6784<\/h4>\n<p><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> arr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> i<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ n-1 \u8f6e<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> arr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span> <span class=\"token operator\">&#8211;<\/span> i<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span> <span class=\"token comment\">\/\/ \u6bcf\u8f6e\u51cf\u5c11\u6bd4\u8f83\u6b21\u6570<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> arr<span class=\"token punctuation\">[<\/span>j <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 punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u4ea4\u6362<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u4f18\u5316<\/h4>\n<p>\u6dfb\u52a0 boolean swapped \u6807\u5fd7\u4f4d\u3002\u82e5\u67d0\u8f6e\u65e0\u4ea4\u6362&#xff0c;\u8bf4\u660e\u5df2\u6709\u5e8f&#xff0c;\u63d0\u524d\u7ec8\u6b62\u3002<\/p>\n<h4>4. \u7279\u6027<\/h4>\n<ul>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6&#xff1a;\u5e73\u5747 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(n2)O(n^2)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1.0641em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\"><span class=\"mord mathnormal\">n<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u6700\u597d <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(n)O(n)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff08;\u5df2\u6709\u5e8f&#xff09;\u3002<\/li>\n<li>\u7a33\u5b9a\u6027&#xff1a;\u7a33\u5b9a\u3002<\/li>\n<li>\u7a7a\u95f4\u590d\u6742\u5ea6&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(1)O(1)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 85 \u671f&#xff1a;\u9009\u62e9\u6392\u5e8f\u7b97\u6cd5\u8be6\u89e3<\/h3>\n<h4>1. \u601d\u8def<\/h4>\n<p>\u6bcf\u4e00\u8f6e\u4ece\u5f85\u6392\u5e8f\u90e8\u5206\u9009\u51fa\u6700\u5c0f\u5143\u7d20&#xff0c;\u4e0e\u5f85\u6392\u5e8f\u90e8\u5206\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u4ea4\u6362\u3002<\/p>\n<h4>2. \u4ee3\u7801\u7ed3\u6784<\/h4>\n<p><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> arr<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/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 keyword\">int<\/span> minIndex <span class=\"token operator\">&#061;<\/span> i<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> j <span class=\"token operator\">&lt;<\/span> arr<span class=\"token punctuation\">.<\/span>length<span class=\"token punctuation\">;<\/span> j<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>arr<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&lt;<\/span> arr<span class=\"token punctuation\">[<\/span>minIndex<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            minIndex <span class=\"token operator\">&#061;<\/span> j<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>minIndex <span class=\"token operator\">!&#061;<\/span> i<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4ea4\u6362 arr[i] \u548c arr[minIndex]<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u5bf9\u6bd4\u5192\u6ce1<\/h4>\n<ul>\n<li>\u4ea4\u6362\u6b21\u6570\u5c11&#xff1a;\u6bcf\u8f6e\u6700\u591a\u4ea4\u6362 1 \u6b21&#xff0c;\u4f18\u4e8e\u5192\u6ce1\u3002<\/li>\n<li>\u7a33\u5b9a\u6027&#xff1a;\u4e0d\u7a33\u5b9a&#xff08;\u76f8\u7b49\u5143\u7d20\u76f8\u5bf9\u4f4d\u7f6e\u53ef\u80fd\u6539\u53d8&#xff09;\u3002<\/li>\n<li>\u65f6\u95f4\u590d\u6742\u5ea6\u59cb\u7ec8\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(n2)O(n^2)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1.0641em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\"><span class=\"mord mathnormal\">n<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 86 \u671f&#xff1a;\u63d2\u5165\u6392\u5e8f\u7b97\u6cd5\u8be6\u89e3<\/h3>\n<h4>1. \u601d\u8def<\/h4>\n<p>\u7c7b\u4f3c\u6253\u6251\u514b\u724c\u7406\u724c\u3002\u5c06\u6570\u7ec4\u5206\u4e3a\u5df2\u6392\u5e8f\u548c\u5f85\u6392\u5e8f\u4e24\u90e8\u5206&#xff0c;\u6bcf\u6b21\u53d6\u51fa\u5f85\u6392\u5e8f\u7b2c\u4e00\u4e2a\u5143\u7d20&#xff0c;\u63d2\u5165\u5230\u5df2\u6392\u5e8f\u90e8\u5206\u7684\u6b63\u786e\u4f4d\u7f6e\u3002<\/p>\n<h4>2. \u4ee3\u7801\u7ed3\u6784<\/h4>\n<p><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\">1<\/span><span class=\"token punctuation\">;<\/span> i <span class=\"token operator\">&lt;<\/span> arr<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    <span class=\"token keyword\">int<\/span> temp <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>i<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> j <span class=\"token operator\">&#061;<\/span> i <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8fb9\u627e\u8fb9\u79fb<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>j <span class=\"token operator\">&gt;&#061;<\/span> <span class=\"token number\">0<\/span> <span class=\"token operator\">&amp;&amp;<\/span> arr<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&gt;<\/span> temp<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        arr<span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> arr<span class=\"token punctuation\">[<\/span>j<span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        j<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    arr<span class=\"token punctuation\">[<\/span>j <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token operator\">&#061;<\/span> temp<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u7279\u6027<\/h4>\n<ul>\n<li>\u6700\u597d\u60c5\u51b5&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(n)O(n)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff08;\u5df2\u6709\u5e8f&#xff09;\u3002<\/li>\n<li>\u6700\u574f\u60c5\u51b5&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">O(n2)O(n^2)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1.0641em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.0278em\">O<\/span><span class=\"mopen\">(<\/span><span class=\"mord\"><span class=\"mord mathnormal\">n<\/span><span class=\"msupsub\"><span class=\"vlist-t\"><span class=\"vlist-r\"><span class=\"vlist\" style=\"height: 0.8141em\"><span class=\"\" style=\"top: -3.063em;margin-right: 0.05em\"><span class=\"pstrut\" style=\"height: 2.7em\"><\/span><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff08;\u5b8c\u5168\u9006\u5e8f&#xff09;\u3002<\/li>\n<li>\u7a33\u5b9a\u6027&#xff1a;\u7a33\u5b9a\u3002<\/li>\n<li>\u9002\u7528\u573a\u666f&#xff1a;\u6570\u636e\u91cf\u5c0f\u6216\u57fa\u672c\u6709\u5e8f\u65f6\u6548\u7387\u5f88\u9ad8&#xff0c;\u662f\u5b9e\u9645\u5f00\u53d1\u4e2d\u5e38\u7528\u7684\u57fa\u7840\u6392\u5e8f&#xff08;\u5982 JDK \u6e90\u7801\u4e2d\u7684\u6df7\u5408\u6392\u5e8f&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 87 \u671f&#xff1a;\u6570\u7ec4\u7efc\u5408\u6848\u4f8b\u2014\u2014\u62bd\u5956\u7cfb\u7edf<\/h3>\n<h4>1. \u9700\u6c42<\/h4>\n<ul>\n<li>\u5956\u6c60\u62bd\u53d6\u5956\u54c1&#xff0c;\u4e0d\u91cd\u590d\u3002<\/li>\n<li>\u67e5\u770b\u5269\u4f59\u5956\u54c1\u3001\u5df2\u4e2d\u5956\u54c1\u3002<\/li>\n<\/ul>\n<h4>2. \u6838\u5fc3\u6280\u5de7&#xff1a;\u6a21\u62df\u5220\u9664<\/h4>\n<p>\u7531\u4e8e\u6570\u7ec4\u957f\u5ea6\u56fa\u5b9a&#xff0c;\u65e0\u6cd5\u76f4\u63a5\u5220\u9664\u5143\u7d20\u3002<\/p>\n<ul>\n<li>\u7b56\u7565&#xff1a;\u7528\u53d8\u91cf count \u8bb0\u5f55\u6709\u6548\u5956\u54c1\u6570\u91cf\u3002<\/li>\n<li>\u79fb\u9664\u903b\u8f91&#xff1a;\u968f\u673a\u62bd\u53d6\u7d22\u5f15 index \u7684\u5143\u7d20&#xff0c;\u5c06\u6700\u540e\u4e00\u4e2a\u6709\u6548\u5143\u7d20 (prizes[count-1]) \u590d\u5236\u5230 index \u4f4d\u7f6e&#xff0c;\u7136\u540e count&#8211;\u3002<\/li>\n<li>\u4f18\u70b9&#xff1a;\u65e0\u9700\u79fb\u52a8\u5927\u91cf\u5143\u7d20&#xff0c;\u6548\u7387\u9ad8&#xff08;\u9002\u7528\u4e8e\u4e0d\u5173\u5fc3\u987a\u5e8f\u7684\u573a\u666f&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 88 \u671f&#xff1a;\u6570\u7ec4\u7efc\u5408\u6848\u4f8b\u2014\u2014\u6210\u7ee9\u7ba1\u7406\u7cfb\u7edf<\/h3>\n<h4>1. \u529f\u80fd\u6a21\u5757<\/h4>\n<ul>\n<li>\u589e&#xff1a;\u6dfb\u52a0\u5230\u6570\u7ec4\u672b\u5c3e&#xff0c;\u589e\u52a0\u8ba1\u6570\u3002<\/li>\n<li>\u67e5&#xff1a;\u904d\u5386\u6253\u5370\u3002<\/li>\n<li>\u7edf&#xff1a;\u4e00\u6b21\u904d\u5386\u8ba1\u7b97\u603b\u5206\u3001\u6700\u9ad8\u3001\u6700\u4f4e\u3002<\/li>\n<li>\u6392&#xff1a;\u4f7f\u7528 Arrays.copyOf \u590d\u5236\u526f\u672c\u540e\u6392\u5e8f&#xff0c;\u4fdd\u7559\u539f\u987a\u5e8f\u3002<\/li>\n<li>\u641c&#xff1a;\u904d\u5386\u67e5\u627e\u6216\u4e8c\u5206\u67e5\u627e&#xff08;\u9700\u5148\u6392\u5e8f&#xff09;\u3002<\/li>\n<li>\u6bb5&#xff1a;\u7edf\u8ba1\u5404\u5206\u6570\u6bb5\u4eba\u6570\u3002<\/li>\n<\/ul>\n<h4>2. \u8bbe\u8ba1\u6a21\u5f0f<\/h4>\n<ul>\n<li>\u5b9a\u957f\u6570\u7ec4 &#043; \u8ba1\u6570\u5668&#xff1a;\u8fd9\u662f\u4f7f\u7528\u539f\u751f\u6570\u7ec4\u6a21\u62df\u52a8\u6001\u5217\u8868\u7684\u6807\u51c6\u505a\u6cd5\u3002<\/li>\n<li>\u83dc\u5355\u9a71\u52a8&#xff1a;while(true) &#043; switch \u5b9e\u73b0\u4ea4\u4e92\u754c\u9762\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 89 \u671f&#xff1a;\u65b9\u6cd5&#xff08;Method&#xff09;\u7684\u5b9a\u4e49\u4e0e\u8c03\u7528<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<p>\u65b9\u6cd5\u662f\u5b8c\u6210\u7279\u5b9a\u529f\u80fd\u7684\u4ee3\u7801\u5757&#xff0c;\u5b9e\u73b0\u4ee3\u7801\u590d\u7528\u548c\u6a21\u5757\u5316\u3002<\/p>\n<h4>2. \u5b9a\u4e49\u683c\u5f0f<\/h4>\n<p>\u4fee\u9970\u7b26 \u8fd4\u56de\u503c\u7c7b\u578b \u65b9\u6cd5\u540d<span class=\"token punctuation\">(<\/span>\u53c2\u6570\u5217\u8868<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    \u65b9\u6cd5\u4f53<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> \u8fd4\u56de\u503c<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ void \u7c7b\u578b\u53ef\u4e0d\u5199\u6216\u53ea\u5199 return<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. \u8c03\u7528<\/h4>\n<ul>\n<li>\u65e0\u8fd4\u56de\u503c&#xff1a;\u65b9\u6cd5\u540d(\u5b9e\u53c2);<\/li>\n<li>\u6709\u8fd4\u56de\u503c&#xff1a;\u6570\u636e\u7c7b\u578b \u53d8\u91cf &#061; \u65b9\u6cd5\u540d(\u5b9e\u53c2);<\/li>\n<\/ul>\n<h4>4. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u65b9\u6cd5\u5fc5\u987b\u5728\u7c7b\u4e2d\u5b9a\u4e49&#xff0c;\u4e0d\u53ef\u5d4c\u5957\u3002<\/li>\n<li>\u53c2\u6570\u4e2a\u6570\u3001\u7c7b\u578b\u3001\u987a\u5e8f\u9700\u5339\u914d\u3002<\/li>\n<li>return \u8bed\u53e5\u7acb\u5373\u7ed3\u675f\u65b9\u6cd5\u6267\u884c\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 90 \u671f&#xff1a;\u65b9\u6cd5\u7684\u53c2\u6570\u4f20\u9012&#xff08;\u503c\u4f20\u9012&#xff09;<\/h3>\n<p>Java \u4e2d\u53ea\u6709\u503c\u4f20\u9012&#xff0c;\u6ca1\u6709\u5f15\u7528\u4f20\u9012\u3002<\/p>\n<h4>1. \u57fa\u672c\u7c7b\u578b\u53c2\u6570<\/h4>\n<ul>\n<li>\u4f20\u9012\u7684\u662f\u503c\u7684\u526f\u672c\u3002<\/li>\n<li>\u65b9\u6cd5\u5185\u4fee\u6539\u5f62\u53c2&#xff0c;\u4e0d\u5f71\u54cd\u5916\u90e8\u5b9e\u53c2\u3002<\/li>\n<\/ul>\n<h4>2. \u5f15\u7528\u7c7b\u578b\u53c2\u6570&#xff08;\u5982\u6570\u7ec4\u3001\u5bf9\u8c61&#xff09;<\/h4>\n<ul>\n<li>\u4f20\u9012\u7684\u662f\u5730\u5740\u503c\u7684\u526f\u672c\u3002<\/li>\n<li>\u5f62\u53c2\u548c\u5b9e\u53c2\u6307\u5411\u5806\u5185\u5b58\u4e2d\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002<\/li>\n<li>\u4fee\u6539\u5bf9\u8c61\u5185\u5bb9&#xff08;\u5982 arr[0] &#061; 100&#xff09;&#xff1a;\u4f1a\u5f71\u54cd\u5916\u90e8\u5b9e\u53c2&#xff08;\u56e0\u4e3a\u64cd\u4f5c\u7684\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61&#xff09;\u3002<\/li>\n<li>\u91cd\u65b0\u8d4b\u503c&#xff08;\u5982 arr &#061; new int[]{&#8230;}&#xff09;&#xff1a;\u4e0d\u4f1a\u5f71\u54cd\u5916\u90e8\u5b9e\u53c2&#xff08;\u56e0\u4e3a\u53ea\u662f\u6539\u53d8\u4e86\u526f\u672c\u7684\u6307\u5411&#xff0c;\u5b9e\u53c2\u4ecd\u6307\u5411\u539f\u5bf9\u8c61&#xff09;\u3002<\/li>\n<\/ul>\n<h4>3. \u603b\u7ed3\u53e3\u8bc0<\/h4>\n<ul>\n<li>\u6539\u503c\u4e0d\u6539\u5740&#xff0c;\u5916\u9762\u770b\u4e0d\u89c1&#xff08;\u57fa\u672c\u7c7b\u578b&#xff09;\u3002<\/li>\n<li>\u6539\u5740\u4e0d\u6539\u503c&#xff0c;\u5916\u9762\u4e5f\u770b\u4e0d\u89c1&#xff08;\u5f15\u7528\u7c7b\u578b\u91cd\u65b0 new&#xff09;\u3002<\/li>\n<li>\u65e2\u6539\u503c\u53c8\u6539\u5740&#xff08;\u901a\u8fc7\u5f15\u7528\u6765\u4fee\u6539\u5185\u90e8\u72b6\u6001&#xff09;&#xff0c;\u5916\u9762\u770b\u5f97\u5230\u3002<\/li>\n<\/ul>\n<hr \/>\n<p>\u7ed3\u8bed&#xff1a;\u606d\u559c&#xff01;\u4f60\u5df2\u7ecf\u638c\u63e1\u4e86 Java \u57fa\u7840\u8bed\u6cd5\u7684\u6838\u5fc3\u652f\u67f1&#xff1a;\u6570\u7ec4\u4e0e\u65b9\u6cd5\u3002\u6570\u7ec4\u8ba9\u4f60\u80fd\u591f\u6279\u91cf\u5904\u7406\u6570\u636e&#xff0c;\u65b9\u6cd5\u8ba9\u4f60\u80fd\u591f\u7ec4\u7ec7\u548c\u7ba1\u7406\u903b\u8f91\u3002\u63a5\u4e0b\u6765&#xff0c;\u6211\u4eec\u5c06\u8fdb\u5165\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b&#xff08;OOP&#xff09;\u7684\u4e16\u754c&#xff0c;\u5b66\u4e60\u5982\u4f55\u5c01\u88c5\u6570\u636e\u4e0e\u884c\u4e3a&#xff0c;\u6784\u5efa\u66f4\u590d\u6742\u7684\u7a0b\u5e8f\u7ed3\u6784\u3002<\/p>\n<hr \/>\n<h2>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 91-100 \u671f)<\/h2>\n<p>\u7b80\u4ecb&#xff1a;\u672c\u9636\u6bb5\u6df1\u5165\u8bb2\u89e3\u65b9\u6cd5\u7684\u9ad8\u7ea7\u7279\u6027&#xff08;\u91cd\u8f7d\u3001\u53ef\u53d8\u53c2\u6570\u3001\u9012\u5f52&#xff09;&#xff0c;\u4ecb\u7ecd\u5e38\u7528\u7c7b\u5e93&#xff08;String, StringBuilder, Date\/Time, System&#xff09;&#xff0c;\u5e76\u56de\u987e\u6574\u4e2a\u57fa\u7840\u8bed\u6cd5\u9636\u6bb5\u7684\u5b66\u4e60\u8def\u7ebf&#xff0c;\u4e3a\u8fdb\u5165\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b&#xff08;OOP&#xff09;\u6253\u4e0b\u575a\u5b9e\u57fa\u7840\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 91 \u671f&#xff1a;\u65b9\u6cd5\u7684\u91cd\u8f7d&#xff08;Overload&#xff09;<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<p>\u5728\u540c\u4e00\u4e2a\u7c7b\u4e2d&#xff0c;\u5141\u8bb8\u5b58\u5728\u4e00\u4e2a\u4ee5\u4e0a\u7684\u540c\u540d\u65b9\u6cd5&#xff0c;\u53ea\u8981\u5b83\u4eec\u7684\u53c2\u6570\u5217\u8868\u4e0d\u540c\u5373\u53ef\u3002<\/p>\n<ul>\n<li>\u76ee\u7684&#xff1a;\u529f\u80fd\u76f8\u4f3c\u7684\u65b9\u6cd5\u4f7f\u7528\u76f8\u540c\u540d\u79f0&#xff0c;\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u6613\u7528\u6027&#xff08;\u5982 System.out.println&#xff09;\u3002<\/li>\n<\/ul>\n<h4>2. \u5224\u5b9a\u6807\u51c6<\/h4>\n<ul>\n<li>\u5fc5\u987b\u6ee1\u8db3&#xff1a;\n<li>\u540c\u4e00\u4e2a\u7c7b\u4e2d\u3002<\/li>\n<li>\u65b9\u6cd5\u540d\u76f8\u540c\u3002<\/li>\n<li>\u53c2\u6570\u5217\u8868\u4e0d\u540c&#xff08;\u53c2\u6570\u4e2a\u6570\u3001\u53c2\u6570\u7c7b\u578b\u3001\u53c2\u6570\u987a\u5e8f\u4e0d\u540c&#xff09;\u3002<\/li>\n<\/li>\n<li>\u65e0\u5173\u56e0\u7d20&#xff1a;\n<ul>\n<li>\u8fd4\u56de\u503c\u7c7b\u578b\u4e0d\u540c&#xff08;\u4e0d\u7b97\u91cd\u8f7d&#xff0c;\u7f16\u8bd1\u5668\u65e0\u6cd5\u533a\u5206\u8c03\u7528\u54ea\u4e2a&#xff09;\u3002<\/li>\n<li>\u4fee\u9970\u7b26\u4e0d\u540c\u3002<\/li>\n<li>\u53c2\u6570\u540d\u4e0d\u540c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>3. \u65b9\u6cd5\u7b7e\u540d<\/h4>\n<ul>\n<li>\u5b9a\u4e49&#xff1a;\u65b9\u6cd5\u540d &#043; \u53c2\u6570\u5217\u8868\u3002<\/li>\n<li>\u4f5c\u7528&#xff1a;\u552f\u4e00\u6807\u8bc6\u4e00\u4e2a\u65b9\u6cd5\u3002\u91cd\u8f7d\u5373\u610f\u5473\u7740\u65b9\u6cd5\u7b7e\u540d\u4e0d\u540c\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 92 \u671f&#xff1a;\u53ef\u53d8\u53c2\u6570&#xff08;VarArgs&#xff09;\u7684\u4f7f\u7528<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<p>\u65b9\u6cd5\u7684\u53c2\u6570\u4e2a\u6570\u53ef\u4ee5\u53d8\u5316&#xff0c;\u652f\u6301 0 \u4e2a\u30011 \u4e2a\u6216\u591a\u4e2a\u53c2\u6570\u3002<\/p>\n<h4>2. \u8bed\u6cd5<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">methodName<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Type<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> paramName<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><\/p>\n<ul>\n<li>\u672c\u8d28\u662f\u4e00\u4e2a\u6570\u7ec4\u3002\u5728\u65b9\u6cd5\u5185\u90e8&#xff0c;paramName \u88ab\u89c6\u4e3a Type[] \u6570\u7ec4\u3002<\/li>\n<\/ul>\n<h4>3. \u89c4\u5219<\/h4>\n<li>\u4e00\u4e2a\u65b9\u6cd5\u6700\u591a\u53ea\u80fd\u6709\u4e00\u4e2a\u53ef\u53d8\u53c2\u6570\u3002<\/li>\n<li>\u53ef\u53d8\u53c2\u6570\u5fc5\u987b\u4f4d\u4e8e\u53c2\u6570\u5217\u8868\u7684\u6700\u540e\u3002<\/li>\n<li>\u53ef\u4ee5\u76f4\u63a5\u4f20\u5165\u6570\u7ec4&#xff0c;\u4e5f\u53ef\u4ee5\u9010\u4e2a\u4f20\u5165\u5143\u7d20\u3002<\/li>\n<h4>4. \u793a\u4f8b<\/h4>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">int<\/span> <span class=\"token function\">sum<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span> nums<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> sum <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\">int<\/span> num <span class=\"token operator\">:<\/span> nums<span class=\"token punctuation\">)<\/span> sum <span class=\"token operator\">&#043;&#061;<\/span> num<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> sum<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u8c03\u7528&#xff1a;sum(), sum(1), sum(1, 2, 3) \u5747\u5408\u6cd5<\/span><\/p>\n<hr \/>\n<h3>\u7b2c 93 \u671f&#xff1a;\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u4e0e void \u5173\u952e\u5b57<\/h3>\n<h4>1. \u8fd4\u56de\u503c\u7c7b\u578b<\/h4>\n<ul>\n<li>\u6709\u8fd4\u56de\u503c&#xff1a;\u6307\u5b9a\u5177\u4f53\u6570\u636e\u7c7b\u578b&#xff08;\u57fa\u672c\u7c7b\u578b\u6216\u5f15\u7528\u7c7b\u578b&#xff09;\u3002\u65b9\u6cd5\u4f53\u4e2d\u5fc5\u987b\u5305\u542b return \u503c;&#xff0c;\u4e14\u6240\u6709\u6267\u884c\u8def\u5f84\u90fd\u5fc5\u987b\u6709\u8fd4\u56de\u3002<\/li>\n<li>\u65e0\u8fd4\u56de\u503c&#xff1a;\u4f7f\u7528 void\u3002\u65b9\u6cd5\u4f53\u4e2d\u53ef\u4ee5\u6ca1\u6709 return&#xff0c;\u6216\u8005\u4ec5\u5199 return; \u7528\u4e8e\u63d0\u524d\u7ed3\u675f\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<h4>2. return \u7684\u4f5c\u7528<\/h4>\n<li>\u8fd4\u56de\u7ed3\u679c\u7ed9\u8c03\u7528\u8005\u3002<\/li>\n<li>\u7ed3\u675f\u5f53\u524d\u65b9\u6cd5\u7684\u6267\u884c\u3002<\/li>\n<h4>3. \u9009\u62e9\u539f\u5219<\/h4>\n<ul>\n<li>\u9700\u8981\u83b7\u53d6\u8ba1\u7b97\u7ed3\u679c \u2192 \u6709\u8fd4\u56de\u503c\u3002<\/li>\n<li>\u4ec5\u6267\u884c\u64cd\u4f5c&#xff08;\u5982\u6253\u5370\u3001\u4fee\u6539\u5bf9\u8c61\u72b6\u6001&#xff09; \u2192 void\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 94 \u671f&#xff1a;\u65b9\u6cd5\u7684\u9012\u5f52\u8c03\u7528<\/h3>\n<h4>1. \u6982\u5ff5<\/h4>\n<p>\u65b9\u6cd5\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u8c03\u7528\u81ea\u8eab\u3002<\/p>\n<h4>2. \u6838\u5fc3\u8981\u7d20<\/h4>\n<li>\u9012\u5f52\u51fa\u53e3&#xff08;Base Case&#xff09;&#xff1a;\u7ec8\u6b62\u6761\u4ef6&#xff0c;\u9632\u6b62\u65e0\u9650\u9012\u5f52\u5bfc\u81f4\u6808\u6ea2\u51fa&#xff08;StackOverflowError&#xff09;\u3002<\/li>\n<li>\u9012\u5f52\u4f53&#xff08;Recursive Step&#xff09;&#xff1a;\u5c06\u5927\u95ee\u9898\u5206\u89e3\u4e3a\u7ed3\u6784\u76f8\u540c\u4f46\u89c4\u6a21\u66f4\u5c0f\u7684\u5b50\u95ee\u9898\u3002<\/li>\n<h4>3. \u7ecf\u5178\u6848\u4f8b<\/h4>\n<ul>\n<li>\u9636\u4e58&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">n!&#061;n\u00d7(n\u22121)!n! &#061; n \\\\times (n-1)!<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">!<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6667em;vertical-align: -0.0833em\"><\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u00d7<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)!<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u51fa\u53e3 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">1!&#061;11! &#061; 1<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6944em\"><\/span><span class=\"mord\">1<\/span><span class=\"mclose\">!<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>\u3002<\/li>\n<li>\u6590\u6ce2\u90a3\u5951\u6570\u5217&#xff1a;<span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">F(n)&#061;F(n\u22121)&#043;F(n\u22122)F(n) &#061; F(n-1) &#043; F(n-2)<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">F<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">F<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">F<\/span><span class=\"mopen\">(<\/span><span class=\"mord mathnormal\">n<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">\u2212<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\">2<\/span><span class=\"mclose\">)<\/span><\/span><\/span><\/span><\/span>&#xff0c;\u51fa\u53e3 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">F(1)&#061;1,F(2)&#061;1F(1)&#061;1, F(2)&#061;1<\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">F<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">1<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord\">1<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.1389em\">F<\/span><span class=\"mopen\">(<\/span><span class=\"mord\">2<\/span><span class=\"mclose\">)<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>\u3002\n<ul>\n<li>\u6ce8\u610f&#xff1a;\u6734\u7d20\u9012\u5f52\u5b9e\u73b0\u6590\u6ce2\u90a3\u5951\u6548\u7387\u4f4e&#xff08;\u91cd\u590d\u8ba1\u7b97&#xff09;&#xff0c;\u5927\u6570\u636e\u91cf\u4e0b\u5efa\u8bae\u4f7f\u7528\u5faa\u73af\u6216\u8bb0\u5fc6\u5316\u641c\u7d22\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h4>4. \u4f18\u7f3a\u70b9<\/h4>\n<ul>\n<li>\u4f18\u70b9&#xff1a;\u4ee3\u7801\u7b80\u6d01&#xff0c;\u903b\u8f91\u6e05\u6670&#xff0c;\u9002\u5408\u89e3\u51b3\u5929\u7136\u9012\u5f52\u95ee\u9898&#xff08;\u5982\u6811\u904d\u5386\u3001\u6c49\u8bfa\u5854&#xff09;\u3002<\/li>\n<li>\u7f3a\u70b9&#xff1a;\u6027\u80fd\u5f00\u9500\u5927&#xff08;\u6808\u7a7a\u95f4\u5360\u7528&#xff09;&#xff0c;\u53ef\u80fd\u5b58\u5728\u91cd\u590d\u8ba1\u7b97&#xff0c;\u8c03\u8bd5\u56f0\u96be\u3002<\/li>\n<li>\u5efa\u8bae&#xff1a;\u80fd\u7528\u5faa\u73af\u89e3\u51b3\u7684\u4f18\u5148\u7528\u5faa\u73af&#xff1b;\u7279\u6b8a\u573a\u666f\u7528\u9012\u5f52\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 95 \u671f&#xff1a;Debug \u8c03\u8bd5\u6a21\u5f0f\u8fdb\u9636<\/h3>\n<h4>1. \u65ad\u70b9&#xff08;Breakpoint&#xff09;<\/h4>\n<p>\u7a0b\u5e8f\u8fd0\u884c\u5230\u6807\u8bb0\u4f4d\u7f6e\u6682\u505c&#xff0c;\u4fbf\u4e8e\u89c2\u5bdf\u72b6\u6001\u3002<\/p>\n<ul>\n<li>\u884c\u65ad\u70b9&#xff1a;\u5e38\u89c4\u65ad\u70b9\u3002<\/li>\n<li>\u6761\u4ef6\u65ad\u70b9&#xff1a;\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6&#xff08;\u5982 i &#061;&#061; 50&#xff09;\u65f6\u624d\u6682\u505c&#xff0c;\u6781\u5927\u63d0\u9ad8\u5faa\u73af\u8c03\u8bd5\u6548\u7387\u3002<\/li>\n<\/ul>\n<h4>2. \u5e38\u7528\u5feb\u6377\u952e<\/h4>\n<table>\n<tr>\u5feb\u6377\u952e\u529f\u80fd\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">F8<\/td>\n<td align=\"left\">Step Over<\/td>\n<td align=\"left\">\u5355\u6b65\u6267\u884c&#xff0c;\u4e0d\u8fdb\u5165\u65b9\u6cd5\u5185\u90e8<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">F7<\/td>\n<td align=\"left\">Step Into<\/td>\n<td align=\"left\">\u5355\u6b65\u6267\u884c&#xff0c;\u8fdb\u5165\u65b9\u6cd5\u5185\u90e8<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">Shift&#043;F8<\/td>\n<td align=\"left\">Step Out<\/td>\n<td align=\"left\">\u8df3\u51fa\u5f53\u524d\u65b9\u6cd5&#xff0c;\u56de\u5230\u8c03\u7528\u5904<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">F9<\/td>\n<td align=\"left\">Resume<\/td>\n<td align=\"left\">\u7ee7\u7eed\u8fd0\u884c\u81f3\u4e0b\u4e00\u4e2a\u65ad\u70b9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>3. \u8c03\u8bd5\u9762\u677f<\/h4>\n<ul>\n<li>Variables&#xff1a;\u67e5\u770b\u5f53\u524d\u53d8\u91cf\u503c&#xff0c;\u652f\u6301\u4fee\u6539\u53d8\u91cf\u6d4b\u8bd5\u3002<\/li>\n<li>Frames (Call Stack)&#xff1a;\u67e5\u770b\u65b9\u6cd5\u8c03\u7528\u6808&#xff0c;\u56de\u6eaf\u8c03\u7528\u6765\u6e90\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 96 \u671f&#xff1a;String \u7c7b\u7684\u5e38\u7528\u65b9\u6cd5\u8be6\u89e3<\/h3>\n<p>String \u662f\u4e0d\u53ef\u53d8\u5b57\u7b26\u5e8f\u5217&#xff0c;\u6240\u6709\u4fee\u6539\u64cd\u4f5c\u5747\u8fd4\u56de\u65b0\u5b57\u7b26\u4e32\u3002<\/p>\n<h4>1. \u83b7\u53d6\u4e0e\u5224\u65ad<\/h4>\n<ul>\n<li>length(): \u957f\u5ea6\u3002<\/li>\n<li>charAt(index): \u83b7\u53d6\u6307\u5b9a\u7d22\u5f15\u5b57\u7b26\u3002<\/li>\n<li>indexOf(str): \u67e5\u627e\u9996\u6b21\u51fa\u73b0\u7d22\u5f15&#xff0c;\u672a\u627e\u5230\u8fd4\u56de -1\u3002<\/li>\n<li>equals(obj): \u6bd4\u8f83\u5185\u5bb9&#xff08;\u4e25\u7981\u4f7f\u7528 &#061;&#061; \u6bd4\u8f83 String \u5185\u5bb9&#xff09;\u3002<\/li>\n<li>contains(str): \u662f\u5426\u5305\u542b\u5b50\u4e32\u3002<\/li>\n<li>startsWith(str) \/ endsWith(str): \u524d\u7f00\/\u540e\u7f00\u5224\u65ad\u3002<\/li>\n<li>isEmpty(): \u662f\u5426\u4e3a\u7a7a\u4e32&#xff08;\u957f\u5ea6\u4e3a0&#xff09;\u3002<\/li>\n<\/ul>\n<h4>2. \u8f6c\u6362\u4e0e\u622a\u53d6<\/h4>\n<ul>\n<li>toUpperCase() \/ toLowerCase(): \u5927\u5c0f\u5199\u8f6c\u6362\u3002<\/li>\n<li>toCharArray(): \u8f6c\u4e3a\u5b57\u7b26\u6570\u7ec4\u3002<\/li>\n<li>substring(beginIndex) \/ substring(begin, end): \u622a\u53d6\u5b50\u4e32&#xff08;\u5de6\u95ed\u53f3\u5f00 [begin, end)&#xff09;\u3002<\/li>\n<li>replace(old, new): \u66ff\u6362\u6240\u6709\u5339\u914d\u9879\u3002<\/li>\n<li>split(regex): \u5206\u5272\u5b57\u7b26\u4e32&#xff0c;\u8fd4\u56de\u6570\u7ec4\u3002<\/li>\n<li>trim(): \u53bb\u9664\u9996\u5c3e\u7a7a\u683c\u3002<\/li>\n<\/ul>\n<h4>3. \u6ce8\u610f\u4e8b\u9879<\/h4>\n<ul>\n<li>\u9891\u7e41\u62fc\u63a5\u5b57\u7b26\u4e32\u4e0d\u8981\u7528 &#043;&#xff0c;\u4f1a\u5bfc\u81f4\u5927\u91cf\u4e34\u65f6\u5bf9\u8c61\u4ea7\u751f&#xff0c;\u5e94\u4f7f\u7528 StringBuilder\u3002<\/li>\n<li>\u5e38\u91cf\u6c60\u4f18\u5316&#xff1a;\u7f16\u8bd1\u671f\u786e\u5b9a\u7684\u5b57\u7b26\u4e32\u5e38\u91cf\u4f1a\u590d\u7528\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 97 \u671f&#xff1a;StringBuilder \u4e0e StringBuffer<\/h3>\n<h4>1. \u4e3a\u4ec0\u4e48\u9700\u8981\u53ef\u53d8\u5b57\u7b26\u4e32<\/h4>\n<p>String \u4e0d\u53ef\u53d8&#xff0c;\u591a\u6b21\u62fc\u63a5\u4f1a\u4ea7\u751f\u5927\u91cf\u5783\u573e\u5bf9\u8c61&#xff0c;\u6548\u7387\u6781\u4f4e\u3002StringBuilder \u5e95\u5c42\u57fa\u4e8e\u53ef\u6269\u5bb9\u7684\u5b57\u7b26\u6570\u7ec4&#xff0c;\u4fee\u6539\u539f\u5bf9\u8c61&#xff0c;\u6548\u7387\u9ad8\u3002<\/p>\n<h4>2. \u5e38\u7528\u65b9\u6cd5<\/h4>\n<ul>\n<li>append(&#8230;): \u8ffd\u52a0\u5185\u5bb9&#xff08;\u652f\u6301\u94fe\u5f0f\u8c03\u7528&#xff09;\u3002<\/li>\n<li>insert(index, str): \u63d2\u5165\u5185\u5bb9\u3002<\/li>\n<li>delete(start, end): \u5220\u9664\u5185\u5bb9\u3002<\/li>\n<li>replace(start, end, str): \u66ff\u6362\u5185\u5bb9\u3002<\/li>\n<li>reverse(): \u53cd\u8f6c\u5b57\u7b26\u4e32\u3002<\/li>\n<li>toString(): \u8f6c\u6362\u4e3a String \u5bf9\u8c61\u3002<\/li>\n<\/ul>\n<h4>3. StringBuilder vs StringBuffer<\/h4>\n<ul>\n<li>StringBuilder: \u975e\u7ebf\u7a0b\u5b89\u5168&#xff0c;\u6548\u7387\u9ad8\u3002\u5355\u7ebf\u7a0b\u9996\u9009\u3002<\/li>\n<li>StringBuffer: \u7ebf\u7a0b\u5b89\u5168&#xff08;synchronized \u4fee\u9970&#xff09;&#xff0c;\u6548\u7387\u8f83\u4f4e\u3002\u591a\u7ebf\u7a0b\u573a\u666f\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h4>4. \u6027\u80fd\u5bf9\u6bd4<\/h4>\n<p>\u5728\u5faa\u73af\u4e2d\u8fdb\u884c\u5927\u91cf\u5b57\u7b26\u4e32\u62fc\u63a5\u65f6&#xff0c;StringBuilder \u6bd4 String &#043; \u5feb\u6570\u4e2a\u6570\u91cf\u7ea7\u3002<\/p>\n<hr \/>\n<h3>\u7b2c 98 \u671f&#xff1a;\u65e5\u671f\u65f6\u95f4\u7c7b<\/h3>\n<h4>1. \u5386\u53f2\u6f14\u8fdb<\/h4>\n<ul>\n<li>\u7b2c\u4e00\u4ee3&#xff1a;Date (java.util.Date)&#xff0c;\u8bbe\u8ba1\u7f3a\u9677\u591a&#xff0c;\u5927\u90e8\u5206\u65b9\u6cd5\u5df2\u5e9f\u5f03\u3002<\/li>\n<li>\u7b2c\u4e8c\u4ee3&#xff1a;Calendar&#xff0c;\u590d\u6742\u4e14\u6708\u4efd\u4ece 0 \u5f00\u59cb&#xff0c;\u6613\u51fa\u9519\u3002<\/li>\n<li>\u7b2c\u4e09\u4ee3&#xff08;\u63a8\u8350&#xff09;&#xff1a;Java 8 API (java.time \u5305)\u3002<\/li>\n<\/ul>\n<h4>2. Java 8 \u65b0 API \u6838\u5fc3\u7c7b<\/h4>\n<ul>\n<li>LocalDate: \u53ea\u5305\u542b\u65e5\u671f&#xff08;\u5e74\u6708\u65e5&#xff09;\u3002<\/li>\n<li>LocalTime: \u53ea\u5305\u542b\u65f6\u95f4&#xff08;\u65f6\u5206\u79d2&#xff09;\u3002<\/li>\n<li>LocalDateTime: \u5305\u542b\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/li>\n<li>\u7279\u70b9&#xff1a;\u4e0d\u53ef\u53d8\u3001\u7ebf\u7a0b\u5b89\u5168\u3001API \u76f4\u89c2\u3001\u6708\u4efd\u4ece 1 \u5f00\u59cb\u3002<\/li>\n<\/ul>\n<h4>3. \u5e38\u7528\u64cd\u4f5c<\/h4>\n<ul>\n<li>\u83b7\u53d6&#xff1a;now(), of(year, month, day&#8230;)\u3002<\/li>\n<li>\u4fee\u6539&#xff1a;plusDays(n), minusMonths(n), withYear(n)&#xff08;\u8fd4\u56de\u65b0\u5bf9\u8c61&#xff09;\u3002<\/li>\n<li>\u683c\u5f0f\u5316&#xff1a;DateTimeFormatter&#xff08;\u7ebf\u7a0b\u5b89\u5168&#xff09;\u3002<\/li>\n<li>\u8ba1\u7b97\u95f4\u9694&#xff1a;Duration (\u65f6\u95f4\u5dee), Period (\u65e5\u671f\u95f4\u9694)\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 99 \u671f&#xff1a;System \u7c7b\u5e38\u7528\u65b9\u6cd5<\/h3>\n<p>System \u662f\u7cfb\u7edf\u5de5\u5177\u7c7b&#xff0c;\u6240\u6709\u6210\u5458\u5747\u4e3a\u9759\u6001\u3002<\/p>\n<h4>1. \u8f93\u5165\u8f93\u51fa<\/h4>\n<ul>\n<li>System.out: \u6807\u51c6\u8f93\u51fa&#xff08;\u63a7\u5236\u53f0&#xff09;\u3002<\/li>\n<li>System.err: \u6807\u51c6\u9519\u8bef\u8f93\u51fa&#xff08;\u901a\u5e38\u7ea2\u8272\u663e\u793a&#xff09;\u3002<\/li>\n<li>System.in: \u6807\u51c6\u8f93\u5165\u6d41\u3002<\/li>\n<\/ul>\n<h4>2. \u65f6\u95f4\u4e0e\u6027\u80fd<\/h4>\n<ul>\n<li>currentTimeMillis(): \u6beb\u79d2\u7ea7\u65f6\u95f4\u6233&#xff0c;\u5e38\u7528\u4e8e\u8ba1\u7b97\u4ee3\u7801\u6267\u884c\u8017\u65f6\u3002<\/li>\n<li>nanoTime(): \u7eb3\u79d2\u7ea7\u9ad8\u7cbe\u5ea6\u8ba1\u65f6&#xff0c;\u7528\u4e8e\u5fae\u57fa\u51c6\u6d4b\u8bd5\u3002<\/li>\n<\/ul>\n<h4>3. \u5176\u4ed6\u5b9e\u7528\u65b9\u6cd5<\/h4>\n<ul>\n<li>arraycopy(src, srcPos, dest, destPos, length): \u9ad8\u6548\u6570\u7ec4\u62f7\u8d1d\u3002<\/li>\n<li>getProperty(key): \u83b7\u53d6\u7cfb\u7edf\u5c5e\u6027&#xff08;\u5982 OS \u540d\u79f0\u3001Java \u7248\u672c&#xff09;\u3002<\/li>\n<li>exit(status): \u9000\u51fa JVM&#xff08;0 \u6b63\u5e38&#xff0c;\u975e 0 \u5f02\u5e38&#xff09;\u3002<\/li>\n<li>gc(): \u5efa\u8bae JVM \u6267\u884c\u5783\u573e\u56de\u6536&#xff08;\u4ec5\u4e3a\u5efa\u8bae&#xff0c;\u4e0d\u4fdd\u8bc1\u7acb\u5373\u6267\u884c&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c 100 \u671f&#xff1a;\u57fa\u7840\u8bed\u6cd5\u9636\u6bb5\u603b\u7ed3\u4e0e\u56de\u987e<\/h3>\n<h4>1. \u5b66\u4e60\u8def\u7ebf\u56de\u987e<\/h4>\n<ul>\n<li>\u73af\u5883\u642d\u5efa&#xff1a;JDK\/JRE\/JVM \u5173\u7cfb&#xff0c;Hello World\u3002<\/li>\n<li>\u57fa\u7840\u8bed\u6cd5&#xff1a;\u53d8\u91cf\u3001\u6570\u636e\u7c7b\u578b\u3001\u8fd0\u7b97\u7b26\u3001Scanner\u3002<\/li>\n<li>\u6d41\u7a0b\u63a7\u5236&#xff1a;if\/switch \u5206\u652f&#xff0c;while\/for\/do-while \u5faa\u73af&#xff0c;break\/continue\u3002<\/li>\n<li>\u6570\u7ec4&#xff1a;\u4e00\u7ef4\/\u4e8c\u7ef4\u6570\u7ec4&#xff0c;Arrays \u5de5\u5177\u7c7b&#xff0c;\u6392\u5e8f\u7b97\u6cd5&#xff08;\u5192\u6ce1\/\u9009\u62e9\/\u63d2\u5165&#xff09;&#xff0c;\u4e8c\u5206\u67e5\u627e\u3002<\/li>\n<li>\u65b9\u6cd5\u4e0e\u5e38\u7528\u7c7b&#xff1a;\u65b9\u6cd5\u5b9a\u4e49\/\u91cd\u8f7d\/\u9012\u5f52&#xff0c;String\/StringBuilder&#xff0c;\u65e5\u671f\u65f6\u95f4&#xff0c;System\u3002<\/li>\n<\/ul>\n<h4>2. \u6838\u5fc3\u601d\u60f3\u63d0\u5347<\/h4>\n<ul>\n<li>\u6a21\u5757\u5316&#xff1a;\u5c06\u5927\u95ee\u9898\u62c6\u89e3\u4e3a\u5c0f\u65b9\u6cd5\u3002<\/li>\n<li>\u590d\u7528\u610f\u8bc6&#xff1a;\u907f\u514d\u91cd\u590d\u4ee3\u7801\u3002<\/li>\n<li>\u8c03\u8bd5\u80fd\u529b&#xff1a;\u719f\u7ec3\u4f7f\u7528 IDEA Debug \u5de5\u5177\u5b9a\u4f4d Bug\u3002<\/li>\n<li>\u7b97\u6cd5\u601d\u7ef4&#xff1a;\u638c\u63e1\u57fa\u7840\u7684\u6570\u636e\u5904\u7406\u903b\u8f91\u3002<\/li>\n<\/ul>\n<h4>3. \u7eaf\u8fc7\u7a0b\u5f0f vs \u9762\u5411\u5bf9\u8c61<\/h4>\n<ul>\n<li>\u76ee\u524d\u6240\u5b66\u5747\u4e3a\u7eaf\u8fc7\u7a0b\u5f0f\u7f16\u7a0b&#xff08;\u6570\u636e\u4e0e\u65b9\u6cd5\u5206\u79bb&#xff09;\u3002<\/li>\n<li>\u968f\u7740\u9879\u76ee\u89c4\u6a21\u6269\u5927&#xff0c;\u8fc7\u7a0b\u5f0f\u7f16\u7a0b\u7ef4\u62a4\u6210\u672c\u589e\u52a0\u3002<\/li>\n<li>\u4e0b\u4e00\u6b65&#xff1a;\u8fdb\u5165\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b (OOP)&#xff0c;\u5b66\u4e60\u7c7b\u3001\u5bf9\u8c61\u3001\u5c01\u88c5\u3001\u7ee7\u627f\u3001\u591a\u6001&#xff0c;\u8fd9\u662f Java \u7684\u6838\u5fc3\u7075\u9b42\u3002<\/li>\n<\/ul>\n<h4>4. \u7ed3\u8bed<\/h4>\n<p>\u606d\u559c\u5b8c\u6210 Java \u57fa\u7840\u8bed\u6cd5 100 \u671f\u5b66\u4e60&#xff01;\u5730\u57fa\u5df2\u6253\u7262&#xff0c;\u63a5\u4e0b\u6765\u5c06\u5f00\u542f\u9762\u5411\u5bf9\u8c61\u7684\u65b0\u7bc7\u7ae0\u3002<\/p>\n<hr \/>\n<p>\u795d\u8d3a&#xff01; \u4f60\u5df2\u7ecf\u5b8c\u6210\u4e86 Java \u57fa\u7840\u8bed\u6cd5\u7684\u5168\u9762\u5b66\u4e60\u3002\u73b0\u5728\u4f60\u5177\u5907\u4e86\u7f16\u5199\u7ed3\u6784\u5316\u7a0b\u5e8f\u7684\u80fd\u529b\u3002\u8bf7\u51c6\u5907\u597d\u8fce\u63a5\u4e0b\u4e00\u9636\u6bb5\u7684\u6311\u6218&#xff1a;\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b (OOP)\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 1-10 \u671f)\u7b80\u4ecb&#xff1a;\u672c\u7cfb\u5217\u6559\u7a0b\u4ece\u96f6\u5f00\u59cb&#xff0c;\u5e26\u4f60\u4e86\u89e3 Java \u5386\u53f2\u3001\u6838\u5fc3\u7279\u6027\u3001\u73af\u5883\u914d\u7f6e\u53ca\u7b2c\u4e00\u4e2a\u7a0b\u5e8f\u7f16\u5199\u3002\u4e3b\u8981\u57fa\u4e8e Java 8 LTS \u7248\u672c\u8bb2\u89e3\u3002\u7b2c 1 \u671f&#xff1a;Java \u8bed\u8a00\u53d1\u5c55\u5386\u53f2\u4e0e\u6838\u5fc3\u7279\u6027\u4ecb\u7ecd<br \/>\n\u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230 Java \u5165\u95e8\u5230\u7cbe\u901a\u7cfb\u5217\u6559\u7a0b\u7684\u7b2c\u4e00\u671f\u3002\u6211\u662f\u4f60\u4eec\u7684\u8001\u5e08&#xff0c;\u4eca\u5929\u54b1\u4eec\u4ece\u96f6\u5f00\u59cb&#xff0c;\u804a\u804a Java \u8fd9\u95e8\u8bed\u8a00\u5230\u5e95\u662f\u600e\u4e48\u6765\u7684&#xff0c;\u5b83\u6709\u4ec0\u4e48\u725b\u903c\u7684\u5730\u65b9&amp;#xff0<\/p>\n","protected":false},"author":2,"featured_media":91896,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[6394,6499,99,3516,190],"topic":[],"class_list":["post-91897","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-cae","tag-6499","tag-java","tag-3516","tag-190"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7 - \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\/91897.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 1-10 \u671f)\u7b80\u4ecb&#xff1a;\u672c\u7cfb\u5217\u6559\u7a0b\u4ece\u96f6\u5f00\u59cb&#xff0c;\u5e26\u4f60\u4e86\u89e3 Java \u5386\u53f2\u3001\u6838\u5fc3\u7279\u6027\u3001\u73af\u5883\u914d\u7f6e\u53ca\u7b2c\u4e00\u4e2a\u7a0b\u5e8f\u7f16\u5199\u3002\u4e3b\u8981\u57fa\u4e8e Java 8 LTS \u7248\u672c\u8bb2\u89e3\u3002\u7b2c 1 \u671f&#xff1a;Java \u8bed\u8a00\u53d1\u5c55\u5386\u53f2\u4e0e\u6838\u5fc3\u7279\u6027\u4ecb\u7ecd \u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230 Java \u5165\u95e8\u5230\u7cbe\u901a\u7cfb\u5217\u6559\u7a0b\u7684\u7b2c\u4e00\u671f\u3002\u6211\u662f\u4f60\u4eec\u7684\u8001\u5e08&#xff0c;\u4eca\u5929\u54b1\u4eec\u4ece\u96f6\u5f00\u59cb&#xff0c;\u804a\u804a Java \u8fd9\u95e8\u8bed\u8a00\u5230\u5e95\u662f\u600e\u4e48\u6765\u7684&#xff0c;\u5b83\u6709\u4ec0\u4e48\u725b\u903c\u7684\u5730\u65b9&amp;#xff0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/91897.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-08T10:10:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808101014-6a77008620f51.jpg\" \/>\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=\"31 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/91897.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/91897.html\",\"name\":\"\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"isPartOf\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\"},\"datePublished\":\"2026-08-08T10:10:16+00:00\",\"dateModified\":\"2026-08-08T10:10:16+00:00\",\"author\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.wsisp.com\/helps\/91897.html#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.wsisp.com\/helps\/91897.html\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/91897.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9875\",\"item\":\"https:\/\/www.wsisp.com\/helps\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#website\",\"url\":\"https:\/\/www.wsisp.com\/helps\/\",\"name\":\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\",\"description\":\"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41\",\"name\":\"admin\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"contentUrl\":\"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery\",\"caption\":\"admin\"},\"sameAs\":[\"http:\/\/wp.wsisp.com\"],\"url\":\"https:\/\/www.wsisp.com\/helps\/author\/admin\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.wsisp.com\/helps\/91897.html","og_locale":"zh_CN","og_type":"article","og_title":"\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","og_description":"Java \u5165\u95e8\u5230\u7cbe\u901a (\u7b2c 1-10 \u671f)\u7b80\u4ecb&#xff1a;\u672c\u7cfb\u5217\u6559\u7a0b\u4ece\u96f6\u5f00\u59cb&#xff0c;\u5e26\u4f60\u4e86\u89e3 Java \u5386\u53f2\u3001\u6838\u5fc3\u7279\u6027\u3001\u73af\u5883\u914d\u7f6e\u53ca\u7b2c\u4e00\u4e2a\u7a0b\u5e8f\u7f16\u5199\u3002\u4e3b\u8981\u57fa\u4e8e Java 8 LTS \u7248\u672c\u8bb2\u89e3\u3002\u7b2c 1 \u671f&#xff1a;Java \u8bed\u8a00\u53d1\u5c55\u5386\u53f2\u4e0e\u6838\u5fc3\u7279\u6027\u4ecb\u7ecd \u5927\u5bb6\u597d&#xff0c;\u6b22\u8fce\u6765\u5230 Java \u5165\u95e8\u5230\u7cbe\u901a\u7cfb\u5217\u6559\u7a0b\u7684\u7b2c\u4e00\u671f\u3002\u6211\u662f\u4f60\u4eec\u7684\u8001\u5e08&#xff0c;\u4eca\u5929\u54b1\u4eec\u4ece\u96f6\u5f00\u59cb&#xff0c;\u804a\u804a Java \u8fd9\u95e8\u8bed\u8a00\u5230\u5e95\u662f\u600e\u4e48\u6765\u7684&#xff0c;\u5b83\u6709\u4ec0\u4e48\u725b\u903c\u7684\u5730\u65b9&amp;#xff0","og_url":"https:\/\/www.wsisp.com\/helps\/91897.html","og_site_name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","article_published_time":"2026-08-08T10:10:16+00:00","og_image":[{"url":"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808101014-6a77008620f51.jpg"}],"author":"admin","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"admin","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"31 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.wsisp.com\/helps\/91897.html","url":"https:\/\/www.wsisp.com\/helps\/91897.html","name":"\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","isPartOf":{"@id":"https:\/\/www.wsisp.com\/helps\/#website"},"datePublished":"2026-08-08T10:10:16+00:00","dateModified":"2026-08-08T10:10:16+00:00","author":{"@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41"},"breadcrumb":{"@id":"https:\/\/www.wsisp.com\/helps\/91897.html#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.wsisp.com\/helps\/91897.html"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.wsisp.com\/helps\/91897.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"\u9996\u9875","item":"https:\/\/www.wsisp.com\/helps"},{"@type":"ListItem","position":2,"name":"\u3010Java\u5165\u95e8\u5230\u7cbe\u901a\u3011*\u57fa\u7840\u7bc7"}]},{"@type":"WebSite","@id":"https:\/\/www.wsisp.com\/helps\/#website","url":"https:\/\/www.wsisp.com\/helps\/","name":"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3","description":"\u9999\u6e2f\u670d\u52a1\u5668_\u9999\u6e2f\u4e91\u670d\u52a1\u5668\u8d44\u8baf_\u670d\u52a1\u5668\u5e2e\u52a9\u6587\u6863_\u670d\u52a1\u5668\u6559\u7a0b","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.wsisp.com\/helps\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/358e386c577a3ab51c4493330a20ad41","name":"admin","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/www.wsisp.com\/helps\/#\/schema\/person\/image\/","url":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","contentUrl":"https:\/\/gravatar.wp-china-yes.net\/avatar\/?s=96&d=mystery","caption":"admin"},"sameAs":["http:\/\/wp.wsisp.com"],"url":"https:\/\/www.wsisp.com\/helps\/author\/admin"}]}},"_links":{"self":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/91897","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/comments?post=91897"}],"version-history":[{"count":0,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/posts\/91897\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media\/91896"}],"wp:attachment":[{"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/media?parent=91897"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/categories?post=91897"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/tags?post=91897"},{"taxonomy":"topic","embeddable":true,"href":"https:\/\/www.wsisp.com\/helps\/wp-json\/wp\/v2\/topic?post=91897"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}