{"id":89429,"date":"2026-08-03T00:56:30","date_gmt":"2026-08-02T16:56:30","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/89429.html"},"modified":"2026-08-03T00:56:30","modified_gmt":"2026-08-02T16:56:30","slug":"%e8%ae%a1%e7%ae%97%e6%9c%ba%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0-java%e5%9f%ba%e7%a1%80%e4%b8%8e%e5%ba%95%e5%b1%82%e5%8e%9f%e7%90%86%e8%af%a6%e8%a7%a3%e2%91%a2-%e6%b5%81%e7%a8%8b%e6%8e%a7%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/89429.html","title":{"rendered":"\u8ba1\u7b97\u673a\u5b66\u4e60\u7b14\u8bb0 Java\u57fa\u7840\u4e0e\u5e95\u5c42\u539f\u7406\u8be6\u89e3\u2462 \u6d41\u7a0b\u63a7\u5236\u3001\u5927\u6570\u503c\u8fd0\u7b97\u3001\u6570\u7ec4\u4e0e\u591a\u7ef4\u6570\u7ec4"},"content":{"rendered":"<\/p>\n<h2>&#x1f4da; 7\u670831\u65e5\u8bfe\u7a0b\u7b14\u8bb0\u4e0b&#xff1a;\u6d41\u7a0b\u63a7\u5236\u3001\u5927\u6570\u503c\u8fd0\u7b97\u3001\u6570\u7ec4\u4e0e\u591a\u7ef4\u6570\u7ec4<\/h2>\n<h3>\u7b2c\u4e00\u90e8\u5206&#xff1a;\u6d41\u7a0b\u63a7\u5236<\/h3>\n<h4>1.1 \u5757\u4f5c\u7528\u57df<\/h4>\n<p>\u5b9a\u4e49&#xff1a;\u4e00\u5bf9\u82b1\u62ec\u53f7 {} \u5b9a\u4e49\u7684\u4ee3\u7801\u5757&#xff0c;\u5176\u5185\u90e8\u7684\u53d8\u91cf\u4ec5\u5728\u8be5\u5757\u5185\u6709\u6548\u3002<\/p>\n<p>\u6838\u5fc3\u89c4\u5219&#xff1a;<\/p>\n<ul>\n<li>\u5757\u5185\u4e0d\u80fd\u58f0\u660e\u4e0e\u5916\u90e8\u540c\u540d\u7684\u53d8\u91cf&#xff0c;\u5426\u5219\u4f1a\u5f15\u53d1\u7f16\u8bd1\u51b2\u7a81<\/li>\n<li>\u5757\u5185\u58f0\u660e\u7684\u53d8\u91cf&#xff0c;\u4f5c\u7528\u57df\u4ec5\u9650\u4e8e\u8be5\u4ee3\u7801\u5757&#xff0c;\u6267\u884c\u5230\u5757\u7ed3\u675f\u7684 } \u65f6\u53d8\u91cf\u5373\u88ab\u56de\u6536&#xff0c;\u4e4b\u540e\u65e0\u6cd5\u8bbf\u95ee<\/li>\n<li>\u5d4c\u5957\u4ee3\u7801\u5757\u4e2d\u540c\u6837\u4e0d\u80fd\u58f0\u660e\u540c\u540d\u53d8\u91cf&#xff0c;\u8fd9\u4e0e\u6761\u4ef6\u8bed\u53e5&#xff08;\u5982if\u5224\u65ad&#xff09;\u7684\u4f5c\u7528\u57df\u89c4\u5219\u4e00\u81f4<\/li>\n<\/ul>\n<p>\u6bd4\u55bb\u7406\u89e3&#xff1a;\u5c31\u50cf\u5728\u4e00\u4e2a\u5927\u623f\u95f4\u91cc\u5df2\u7ecf\u653e\u4e86\u4e00\u76cf\u706f&#xff08;\u53d8\u91cfa&#xff09;&#xff0c;\u4f60\u4e0d\u80fd\u5728\u91cc\u9762\u7684\u5c0f\u623f\u95f4\u518d\u653e\u4e00\u76cf\u540c\u540d\u7684\u706f&#xff0c;\u5426\u5219\u5c31\u51b2\u7a81\u4e86\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a;\u8fd9\u91cc\u7684\u62a5\u9519\u662f\u56e0\u4e3a\u53d8\u91cf\u91cd\u590d\u58f0\u660e&#xff0c;\u800c\u4e0d\u662f\u56e0\u4e3a\u6ca1\u8d4b\u503c\u3002<\/p>\n<hr \/>\n<h4>1.2 \u5206\u652f\u8bed\u53e5&#xff1a;if \/ else<\/h4>\n<p>\u57fa\u672c\u7ed3\u6784&#xff1a;\u6839\u636e\u6761\u4ef6\u5224\u65ad\u6267\u884c\u4e0d\u540c\u5206\u652f\u7684\u4ee3\u7801\u3002<\/p>\n<p>\u6267\u884c\u89c4\u5219&#xff1a;<\/p>\n<ul>\n<li>\u6761\u4ef6\u5224\u65ad\u662f\u4ece\u4e0a\u5f80\u4e0b\u4f9d\u6b21\u6267\u884c\u7684<\/li>\n<li>\u53ea\u8981\u6ee1\u8db3\u67d0\u4e2a\u6761\u4ef6&#xff0c;\u5c31\u6267\u884c\u5bf9\u5e94\u7684\u4ee3\u7801\u5757\u5e76\u7acb\u5373\u7ed3\u675f\u5224\u65ad<\/li>\n<li>\u53ea\u6709\u524d\u9762\u6240\u6709\u6761\u4ef6\u90fd\u4e0d\u6ee1\u8db3\u65f6&#xff0c;\u624d\u4f1a\u6267\u884c\u6700\u540e\u7684 else \u90e8\u5206<\/li>\n<\/ul>\n<p>\u26a0\ufe0f \u6761\u4ef6\u987a\u5e8f\u7684\u91cd\u8981\u6027&#xff1a;<\/p>\n<p>\u5904\u7406\u8fde\u7eed\u8303\u56f4\u65f6&#xff0c;\u6761\u4ef6\u7684\u6392\u5217\u987a\u5e8f\u81f3\u5173\u91cd\u8981\u3002\u5c31\u50cf\u7b5b\u5b50\u8981\u4ece\u5927\u5b54\u5230\u5c0f\u5b54\u6392\u5217\u624d\u6709\u6548&#xff1a;<\/p>\n<ul>\n<li>\u274c \u9519\u8bef&#xff1a;\u5148\u5224\u65ad age &gt; 20&#xff0c;\u518d\u5224\u65ad age &gt; 80 \u2192 80\u5c81\u7684\u4eba\u4f1a\u88ab\u9519\u8bef\u5f52\u5165&#034;\u5927\u4e8e20&#034;<\/li>\n<li>\u2705 \u6b63\u786e&#xff1a;\u5148\u5224\u65ad age &gt; 80&#xff0c;\u518d\u5224\u65ad age &gt; 30&#xff0c;\u6700\u540e\u5224\u65ad age &gt; 20<\/li>\n<\/ul>\n<p>\u8303\u56f4\u5224\u65ad\u7684\u6b63\u786e\u5199\u6cd5&#xff1a;<\/p>\n<p>\u60f3\u5224\u65ad\u5e74\u9f84\u572820\u523030\u5c81\u4e4b\u95f4&#xff0c;\u4e0d\u80fd\u53ea\u5199 if(age &gt; 20)&#xff0c;\u5fc5\u987b\u540c\u65f6\u6ee1\u8db3\u4e24\u4e2a\u6761\u4ef6&#xff1a;<\/p>\n<p>if (age &gt; 20 &amp;&amp; age &lt; 30) {<br \/>\n    System.out.println(&#034;\u9752\u5e74&#034;);<br \/>\n}<\/p>\n<p>if-else vs switch-case \u7684\u9002\u7528\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>if-else&#xff1a;\u9002\u5408\u8303\u56f4\u5224\u65ad&#xff08;\u5927\u4e8e\u3001\u5c0f\u4e8e\u3001\u533a\u95f4&#xff09;<\/li>\n<li>switch-case&#xff1a;\u9002\u5408\u7cbe\u786e\u503c\u5339\u914d&#xff08;\u7b49\u4e8e\u67d0\u4e2a\u5177\u4f53\u503c&#xff09;<\/li>\n<\/ul>\n<hr \/>\n<h4>1.3 \u5206\u652f\u8bed\u53e5&#xff1a;switch \/ case<\/h4>\n<p>\u9002\u7528\u6761\u4ef6&#xff1a;\u53d8\u91cf\u53d6\u503c\u660e\u786e\u3001\u6709\u9650&#xff0c;\u6bd4\u5982 a \u53ea\u80fd\u662f 5\u300110 \u6216 15 \u8fd9\u51e0\u4e2a\u56fa\u5b9a\u503c\u3002<\/p>\n<p>\u6267\u884c\u6d41\u7a0b&#xff1a;\u7a0b\u5e8f\u4ece\u4e0a\u5230\u4e0b\u9010\u4e2a\u6bd4\u8f83 case&#xff0c;\u5339\u914d\u5230\u5bf9\u5e94\u503c\u540e\u6267\u884c\u4ee3\u7801\u5757&#xff0c;\u9047\u5230 break \u5c31\u7acb\u5373\u9000\u51fa\u6574\u4e2a switch \u7ed3\u6784\u3002<\/p>\n<p>switch \u62ec\u53f7\u5185\u5141\u8bb8\u7684\u7c7b\u578b&#xff1a;<\/p>\n<ul>\n<li>char\u3001byte\u3001short\u3001int<\/li>\n<li>\u679a\u4e3e\u503c&#xff08;\u679a\u4e3e\u5c31\u662f\u53d6\u503c\u56fa\u5b9a\u7684\u7c7b\u578b&#xff09;<\/li>\n<li>\u274c \u4e0d\u80fd\u653e\u81ea\u5b9a\u4e49\u7684\u590d\u6742\u5bf9\u8c61<\/li>\n<\/ul>\n<p>\u26a0\ufe0f case \u51fb\u7a7f\u73b0\u8c61&#xff1a;<\/p>\n<p>\u5982\u679c\u67d0\u4e2a case \u5339\u914d\u540e\u6ca1\u6709\u5199 break&#xff0c;\u7a0b\u5e8f\u4f1a\u7ee7\u7eed\u6267\u884c\u540e\u9762\u6240\u6709 case \u7684\u4ee3\u7801&#xff0c;\u76f4\u5230\u9047\u5230 break \u6216 switch \u7ed3\u675f\u3002\u5c31\u50cf\u6253\u7a7f\u6240\u6709\u5173\u5361\u4e00\u6837\u3002<\/p>\n<ul>\n<li>default \u8bed\u53e5\u7684 break \u53ef\u4ee5\u7701\u7565&#xff0c;\u56e0\u4e3a\u5df2\u7ecf\u662f\u6700\u540e\u4e00\u4e2a\u4e86<\/li>\n<li>\u5f53\u53d8\u91cf\u503c\u4e0d\u5339\u914d\u4efb\u4f55 case \u65f6&#xff0c;\u7a0b\u5e8f\u4f1a\u6267\u884c default \u90e8\u5206&#xff08;\u5904\u7406\u610f\u5916\u60c5\u51b5\u7684\u4fdd\u9669\u673a\u5236&#xff09;<\/li>\n<\/ul>\n<p>\u4ee3\u7801\u6f14\u793a&#xff1a;<\/p>\n<p>int a &#061; 10;<br \/>\nswitch (a) {<br \/>\n    case 5:<br \/>\n        System.out.println(&#034;\u4e94&#034;);<br \/>\n        break;<br \/>\n    case 10:<br \/>\n        System.out.println(&#034;\u5341&#034;);  \/\/ \u5339\u914d\u5230\u8fd9\u91cc<br \/>\n        break;                     \/\/ \u6ca1\u6709break\u5c31\u4f1a\u7ee7\u7eed\u5f80\u4e0b\u6267\u884c&#xff01;<br \/>\n    case 15:<br \/>\n        System.out.println(&#034;\u5341\u4e94&#034;);<br \/>\n        break;<br \/>\n    default:<br \/>\n        System.out.println(&#034;\u5176\u4ed6&#034;);<br \/>\n}<\/p>\n<hr \/>\n<h4>1.4 \u5faa\u73af\u8bed\u53e5<\/h4>\n<h5>\u2460 while \u5faa\u73af<\/h5>\n<p>\u7279\u70b9&#xff1a;\u5148\u5224\u65ad\u6761\u4ef6&#xff0c;\u518d\u6267\u884c\u5faa\u73af\u4f53\u3002\u5982\u679c\u521d\u59cb\u6761\u4ef6\u5c31\u4e0d\u6ee1\u8db3&#xff0c;\u5faa\u73af\u4f53\u4e00\u6b21\u90fd\u4e0d\u4f1a\u6267\u884c\u3002<\/p>\n<p>int a &#061; 10;<br \/>\nwhile (a &gt; 4) {<br \/>\n    System.out.println(a);<br \/>\n    a&#8211;;<br \/>\n}<br \/>\n\/\/ \u8f93\u51fa: 10 9 8 7 6 5&#xff08;a&#061;4\u65f6\u4e0d\u6ee1\u8db3\u6761\u4ef6&#xff0c;\u76f4\u63a5\u9000\u51fa&#xff09;<\/p>\n<hr \/>\n<h5>\u2461 do-while \u5faa\u73af<\/h5>\n<p>\u7279\u70b9&#xff1a;\u5148\u6267\u884c\u4e00\u6b21\u5faa\u73af\u4f53&#xff0c;\u518d\u5224\u65ad\u6761\u4ef6\u3002\u5373\u4f7f\u521d\u59cb\u6761\u4ef6\u4e0d\u6ee1\u8db3&#xff0c;\u4e5f\u81f3\u5c11\u6267\u884c\u4e00\u6b21\u3002\u5c31\u50cf&#034;\u5148\u4e0a\u8f66\u540e\u8865\u7968&#034;\u3002<\/p>\n<p>int a &#061; 4;<br \/>\ndo {<br \/>\n    System.out.println(a); \/\/ \u5148\u6267\u884c&#xff1a;\u6253\u53704<br \/>\n    a&#8211;;                   \/\/ a\u53d8\u62103<br \/>\n} while (a &gt; 4);           \/\/ \u518d\u5224\u65ad&#xff1a;3&gt;4\u4e3afalse&#xff0c;\u9000\u51fa<br \/>\n\/\/ \u8f93\u51fa: 4&#xff08;\u867d\u7136\u6761\u4ef6\u4e00\u5f00\u59cb\u5c31\u4e0d\u6ee1\u8db3&#xff0c;\u4f46\u8fd8\u662f\u6267\u884c\u4e86\u4e00\u6b21&#xff09;<\/p>\n<p>while vs do-while \u5bf9\u6bd4&#xff1a;<\/p>\n<table>\n<tr>\u5bf9\u6bd4\u9879whiledo-while<\/tr>\n<tbody>\n<tr>\n<td>\u5224\u65ad\u65f6\u673a<\/td>\n<td>\u5148\u5224\u65ad\u540e\u6267\u884c<\/td>\n<td>\u5148\u6267\u884c\u540e\u5224\u65ad<\/td>\n<\/tr>\n<tr>\n<td>\u6700\u5c11\u6267\u884c\u6b21\u6570<\/td>\n<td>0\u6b21<\/td>\n<td>1\u6b21<\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/td>\n<td>\u4e0d\u786e\u5b9a\u662f\u5426\u9700\u8981\u6267\u884c<\/td>\n<td>\u81f3\u5c11\u8981\u6267\u884c\u4e00\u6b21<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h5>\u2462 for \u5faa\u73af<\/h5>\n<p>\u7279\u70b9&#xff1a;\u7528\u4e8e\u5df2\u77e5\u5faa\u73af\u6b21\u6570\u7684\u573a\u666f&#xff0c;\u5305\u542b\u521d\u59cb\u5316\u3001\u5faa\u73af\u6761\u4ef6\u548c\u8fed\u4ee3\u4e09\u4e2a\u90e8\u5206\u3002<\/p>\n<p>\u7ed3\u6784\u8bf4\u660e&#xff1a;<\/p>\n<ul>\n<li>\u521d\u59cb\u5316&#xff08;\u5982 i&#061;0&#xff09;\u53ef\u4ee5\u5199\u5728\u5faa\u73af\u5916\u90e8&#xff0c;\u4f46\u901a\u5e38\u653e\u5728\u7b2c\u4e00\u4e2a\u5206\u53f7\u524d<\/li>\n<li>\u5faa\u73af\u6761\u4ef6\u5199\u5728\u7b2c\u4e8c\u4e2a\u4f4d\u7f6e<\/li>\n<li>\u8fed\u4ee3\u8bed\u53e5&#xff08;\u5982 i&#043;&#043;&#xff09;\u65e2\u53ef\u4ee5\u653e\u5728\u7b2c\u4e09\u4e2a\u4f4d\u7f6e&#xff0c;\u4e5f\u53ef\u4ee5\u79fb\u5230\u5faa\u73af\u4f53\u672b\u5c3e&#xff0c;\u6548\u679c\u4e00\u6837<\/li>\n<li>\u4e24\u4e2a\u5206\u53f7\u5fc5\u4e0d\u53ef\u5c11&#xff0c;\u4f46\u4e09\u4e2a\u90e8\u5206\u90fd\u53ef\u4ee5\u7701\u7565&#xff08;\u4e0d\u5199\u5faa\u73af\u6761\u4ef6\u65f6\u8981\u6ce8\u610f\u907f\u514d\u6b7b\u5faa\u73af&#xff09;<\/li>\n<\/ul>\n<p>\/\/ \u6807\u51c6\u5199\u6cd5<br \/>\nfor (int i &#061; 0; i &lt; 10; i&#043;&#043;) {<br \/>\n    System.out.println(i);<br \/>\n}<\/p>\n<p>\/\/ \u7701\u7565\u5199\u6cd5&#xff08;\u5206\u53f7\u4e0d\u80fd\u5c11&#xff09;<br \/>\nint i &#061; 0;<br \/>\nfor (; i &lt; 10; ) {<br \/>\n    System.out.println(i);<br \/>\n    i&#043;&#043;;<br \/>\n}<\/p>\n<hr \/>\n<h5>\u2463 for-each \u5faa\u73af<\/h5>\n<p>\u7279\u70b9&#xff1a;\u7528\u4e8e\u904d\u5386\u6570\u7ec4\u6216\u96c6\u5408&#xff0c;\u7b80\u5316\u4e86\u7d22\u5f15\u64cd\u4f5c\u3002\u524d\u9762\u7684\u53d8\u91cf\u4f1a\u81ea\u52a8\u4f9d\u6b21\u4ee3\u8868\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20&#xff0c;\u4ece\u7b2c\u4e00\u4e2a\u5230\u6700\u540e\u4e00\u4e2a\u3002<\/p>\n<p>\u9002\u7528\u573a\u666f&#xff1a;<\/p>\n<ul>\n<li>\u4e0d\u786e\u5b9a\u6570\u7ec4\u957f\u5ea6\u65f6&#xff08;\u5982\u67d0\u4e9b\u65b9\u6cd5\u8fd4\u56de\u7684\u6570\u7ec4&#xff09;&#xff0c;\u7528 for-each \u66f4\u5b89\u5168&#xff0c;\u4e0d\u7528\u62c5\u5fc3\u8d8a\u754c<\/li>\n<li>\u5df2\u77e5\u957f\u5ea6\u65f6\u7528\u666e\u901a for \u5faa\u73af\u66f4\u5408\u9002<\/li>\n<\/ul>\n<p>\u26a0\ufe0f \u91cd\u8981\u9650\u5236&#xff1a;for-each \u4e2d\u7684\u53d8\u91cf\u4e0d\u80fd\u76f4\u63a5\u4fee\u6539\u539f\u6570\u7ec4\u7684\u503c\u3002\u5c31\u50cf\u7528\u653e\u5927\u955c\u89c2\u5bdf\u6807\u672c&#xff0c;\u4f60\u80fd\u770b\u5230\u6bcf\u4e2a\u7ec6\u8282&#xff08;\u6253\u5370\u6570\u636e&#xff09;&#xff0c;\u4f46\u65e0\u6cd5\u7528\u653e\u5927\u955c\u76f4\u63a5\u6539\u53d8\u6807\u672c\u672c\u8eab\u3002<\/p>\n<p>int[] arr &#061; {1, 2, 3, 4, 5};<\/p>\n<p>\/\/ for-each\u904d\u5386&#xff08;\u53ea\u8bfb&#xff09;<br \/>\nfor (int x : arr) {<br \/>\n    System.out.println(x); \/\/ x\u4f9d\u6b21\u4ee3\u88681,2,3,4,5<br \/>\n}<\/p>\n<p>\/\/ \u274c \u8fd9\u6837\u4e0d\u80fd\u4fee\u6539\u539f\u6570\u7ec4<br \/>\nfor (int x : arr) {<br \/>\n    x &#061; x * 2; \/\/ \u53ea\u4fee\u6539\u4e86\u4e34\u65f6\u53d8\u91cfx&#xff0c;arr\u4e0d\u53d8&#xff01;<br \/>\n}<\/p>\n<hr \/>\n<h4>1.5 \u5faa\u73af\u63a7\u5236&#xff1a;break \u4e0e continue<\/h4>\n<h5>break<\/h5>\n<p>\u4f5c\u7528&#xff1a;\u76f4\u63a5\u7ec8\u6b62\u6574\u4e2a\u5faa\u73af&#xff0c;\u8df3\u51fa\u5faa\u73af\u4f53&#xff0c;\u6267\u884c\u5faa\u73af\u540e\u9762\u7684\u4ee3\u7801\u3002<\/p>\n<p>for (int i &#061; 0; i &lt; 10; i&#043;&#043;) {<br \/>\n    if (i &#061;&#061; 4) {<br \/>\n        break; \/\/ i&#061;4\u65f6\u76f4\u63a5\u7ec8\u6b62&#xff0c;5,6,7,8,9\u90fd\u4e0d\u4f1a\u6267\u884c<br \/>\n    }<br \/>\n    System.out.println(i);<br \/>\n}<br \/>\n\/\/ \u8f93\u51fa: 0 1 2 3<\/p>\n<h5>continue<\/h5>\n<p>\u4f5c\u7528&#xff1a;\u53ea\u8df3\u8fc7\u5f53\u524d\u8fd9\u4e00\u6b21\u5faa\u73af\u7684\u5269\u4f59\u4ee3\u7801&#xff0c;\u76f4\u63a5\u8fdb\u5165\u4e0b\u4e00\u6b21\u5faa\u73af\u3002\u5faa\u73af\u672c\u8eab\u8fd8\u4f1a\u7ee7\u7eed\u3002<\/p>\n<p>for (int i &#061; 0; i &lt; 10; i&#043;&#043;) {<br \/>\n    if (i &#061;&#061; 4) {<br \/>\n        continue; \/\/ i&#061;4\u65f6\u8df3\u8fc7\u6253\u5370&#xff0c;\u4f46\u5faa\u73af\u7ee7\u7eed<br \/>\n    }<br \/>\n    System.out.println(i);<br \/>\n}<br \/>\n\/\/ \u8f93\u51fa: 0 1 2 3 5 6 7 8 9&#xff08;\u8df3\u8fc7\u4e864&#xff09;<\/p>\n<h5>\u5bf9\u6bd4\u603b\u7ed3<\/h5>\n<table>\n<tr>\u5bf9\u6bd4\u9879breakcontinue<\/tr>\n<tbody>\n<tr>\n<td>\u6548\u679c<\/td>\n<td>\u5f7b\u5e95\u9000\u51fa\u5faa\u73af<\/td>\n<td>\u8df3\u8fc7\u672c\u8f6e&#xff0c;\u7ee7\u7eed\u4e0b\u4e00\u8f6e<\/td>\n<\/tr>\n<tr>\n<td>\u540e\u7eed\u8fed\u4ee3<\/td>\n<td>\u4e0d\u518d\u6267\u884c<\/td>\n<td>\u4ecd\u7136\u6267\u884c<\/td>\n<\/tr>\n<tr>\n<td>\u6bd4\u55bb<\/td>\n<td>\u76f4\u63a5\u79bb\u5f00\u6559\u5ba4<\/td>\n<td>\u8fd9\u8282\u8bfe\u4e0d\u542c&#xff0c;\u4e0b\u8282\u8bfe\u8fd8\u6765<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h4>1.6 \u5e26\u6807\u7b7e\u7684 break \u4e0e continue&#xff08;\u4e86\u89e3\u5373\u53ef&#xff09;<\/h4>\n<p>\u53ef\u4ee5\u7ed9\u5916\u5c42\u5faa\u73af\u8bbe\u7f6e\u4e00\u4e2a\u6807\u7b7e&#xff0c;\u7136\u540e\u5728 break \u6216 continue \u540e\u9762\u52a0\u4e0a\u6807\u7b7e\u540d&#xff0c;\u63a7\u5236\u5177\u4f53\u8df3\u51fa\u54ea\u4e2a\u5faa\u73af\u3002<\/p>\n<p>outer:<br \/>\nfor (int i &#061; 0; i &lt; 5; i&#043;&#043;) {<br \/>\n    for (int j &#061; 0; j &lt; 5; j&#043;&#043;) {<br \/>\n        if (j &#061;&#061; 3) {<br \/>\n            break outer;    \/\/ \u76f4\u63a5\u7ed3\u675f\u6574\u4e2a\u5916\u5c42\u5faa\u73af<br \/>\n            \/\/ continue outer; \/\/ \u8df3\u8fc7\u5916\u5c42\u5faa\u73af\u7684\u672c\u6b21\u8fed\u4ee3&#xff0c;\u8fdb\u5165i\u7684\u4e0b\u4e00\u8f6e<br \/>\n        }<br \/>\n        System.out.println(i &#043; &#034;,&#034; &#043; j);<br \/>\n    }<br \/>\n}<\/p>\n<p>\u6ce8\u610f&#xff1a;<\/p>\n<ul>\n<li>break outer&#xff1a;\u76f4\u63a5\u7ed3\u675f\u6574\u4e2a\u5916\u5c42\u5faa\u73af&#xff08;\u4e0d\u662f\u5185\u5c42&#xff09;<\/li>\n<li>continue outer&#xff1a;\u8df3\u8fc7\u5916\u5c42\u5faa\u73af\u7684\u672c\u6b21\u8fed\u4ee3&#xff0c;\u76f4\u63a5\u5f00\u59cb\u4e0b\u4e00\u6b21\u5916\u5c42\u5faa\u73af<\/li>\n<li>\u5b9e\u9645\u5f00\u53d1\u4e2d\u5f88\u5c11\u4f7f\u7528\u8fd9\u79cd\u5199\u6cd5&#xff0c;\u4e86\u89e3\u5373\u53ef<\/li>\n<\/ul>\n<hr \/>\n<h4>1.7 \u5d4c\u5957\u5faa\u73af\u7684\u6267\u884c\u8fc7\u7a0b<\/h4>\n<p>\u5916\u5c42\u5faa\u73af\u6bcf\u6267\u884c\u4e00\u6b21&#xff0c;\u5185\u5c42\u5faa\u73af\u4f1a\u5b8c\u6574\u6267\u884c\u4e00\u8f6e\u3002<\/p>\n<p>for (int i &#061; 0; i &lt; 3; i&#043;&#043;) {<br \/>\n    for (int j &#061; 0; j &lt; 4; j&#043;&#043;) {<br \/>\n        System.out.println(&#034;i&#061;&#034; &#043; i &#043; &#034;, j&#061;&#034; &#043; j);<br \/>\n    }<br \/>\n}<br \/>\n\/\/ i&#061;0\u65f6&#xff0c;j\u4ece0\u52303\u5168\u90e8\u6267\u884c<br \/>\n\/\/ i&#061;1\u65f6&#xff0c;j\u4ece0\u52303\u5168\u90e8\u6267\u884c<br \/>\n\/\/ i&#061;2\u65f6&#xff0c;j\u4ece0\u52303\u5168\u90e8\u6267\u884c<\/p>\n<p>\u6ce8\u610f&#xff1a;break \u53ea\u4f1a\u5f71\u54cd\u5f53\u524d\u6240\u5728\u7684\u5faa\u73af\u5c42&#xff0c;\u4e0d\u4f1a\u8de8\u5c42\u3002<\/p>\n<hr \/>\n<h3>\u7b2c\u4e8c\u90e8\u5206&#xff1a;\u5927\u6570\u503c\u8fd0\u7b97<\/h3>\n<h4>2.1 \u57fa\u672c\u7c7b\u578b\u7684\u5c40\u9650<\/h4>\n<ul>\n<li>\u57fa\u7840\u6570\u636e\u7c7b\u578b&#xff08;int\u3001float\u3001double&#xff09;\u5b58\u5728\u6570\u503c\u8303\u56f4\u548c\u7cbe\u5ea6\u95ee\u9898<\/li>\n<li>64\u4f4d\u7cfb\u7edf\u6700\u591a\u53ea\u80fd\u752864\u4e2a\u6bd4\u7279\u4f4d\u6765\u8868\u793a\u6570\u636e&#xff0c;\u8d85\u51fa\u8303\u56f4\u8fd0\u7b97\u7ed3\u679c\u5c31\u4f1a\u51fa\u9519<\/li>\n<li>float \u548c double \u5e76\u4e0d\u80fd\u7cbe\u786e\u8868\u793a\u6240\u6709\u5c0f\u6570&#xff0c;\u8ba1\u7b97\u7ed3\u679c\u53ef\u80fd\u51fa\u73b0\u504f\u5dee<\/li>\n<li>\u5373\u4f7f\u662f64\u4f4d\u7684 double \u7c7b\u578b&#xff0c;\u4e5f\u6709\u5b83\u7684\u8868\u793a\u4e0a\u9650<\/li>\n<\/ul>\n<p>\u5178\u578b\u95ee\u9898&#xff1a;\u8d27\u5e01\u8fd0\u7b97\u7b49\u9700\u8981\u7cbe\u786e\u8ba1\u7b97\u7684\u573a\u666f&#xff0c;\u4e0d\u80fd\u7528 float \u6216 double\u3002<\/p>\n<hr \/>\n<h4>2.2 BigInteger \u4e0e BigDecimal<\/h4>\n<table>\n<tr>\u7c7b\u7528\u9014<\/tr>\n<tbody>\n<tr>\n<td>BigInteger<\/td>\n<td>\u5927\u6574\u6570\u8fd0\u7b97&#xff08;\u8d85\u51falong\u8303\u56f4\u7684\u6574\u6570&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>BigDecimal<\/td>\n<td>\u9ad8\u7cbe\u5ea6\u5c0f\u6570\u8fd0\u7b97&#xff08;\u5982\u8d27\u5e01\u8ba1\u7b97&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h4>2.3 \u521b\u5efa\u65b9\u5f0f<\/h4>\n<p>\u4e24\u79cd\u65b9\u5f0f&#xff1a;<\/p>\n<li>valueOf() \u65b9\u6cd5 \/ \u76f4\u63a5\u8d4b\u503c&#xff1a;\u6570\u503c\u5fc5\u987b\u5728 long \u7c7b\u578b\u7684\u8303\u56f4\u5185&#xff0c;\u5426\u5219\u62a5\u9519<\/li>\n<li>new &#043; \u5b57\u7b26\u4e32\u53c2\u6570&#xff1a;\u53ef\u4ee5\u4f20\u5165\u8d85\u51fa long \u8303\u56f4\u7684\u5b57\u7b26\u4e32&#xff0c;\u8868\u793a\u8d85\u5927\u6570\u503c<\/li>\n<p>\/\/ BigInteger<br \/>\nBigInteger a &#061; BigInteger.valueOf(100);        \/\/ \u65b9\u5f0f1&#xff1a;\u8303\u56f4\u5185<br \/>\nBigInteger b &#061; new BigInteger(&#034;99999999999999999999&#034;); \/\/ \u65b9\u5f0f2&#xff1a;\u8d85\u8303\u56f4\u7528\u5b57\u7b26\u4e32<\/p>\n<p>\/\/ BigDecimal&#xff08;\u63a8\u8350\u7528\u5b57\u7b26\u4e32\u521b\u5efa&#xff0c;\u907f\u514d\u7cbe\u5ea6\u95ee\u9898&#xff09;<br \/>\nBigDecimal c &#061; new BigDecimal(&#034;3.14159265358979323846&#034;);<br \/>\nBigDecimal d &#061; BigDecimal.valueOf(3.14);<\/p>\n<hr \/>\n<h4>2.4 \u8fd0\u7b97\u65b9\u5f0f<\/h4>\n<p>\u6838\u5fc3\u89c4\u5219&#xff1a;\u4e0d\u4f7f\u7528\u4f20\u7edf\u7684 &#043;\u3001-\u3001*\u3001\/ \u8fd0\u7b97\u7b26&#xff0c;\u800c\u662f\u8c03\u7528\u76f8\u5e94\u7684\u65b9\u6cd5\u8fdb\u884c\u8fd0\u7b97\u3002<\/p>\n<p>\u5c31\u50cf\u4e0d\u80fd\u76f4\u63a5\u7528 &#043; \u53f7\u628a\u4e24\u4e2a\u7bb1\u5b50\u76f8\u52a0&#xff0c;\u800c\u8981\u6253\u5f00\u7bb1\u5b50\u53d6\u51fa\u91cc\u9762\u7684\u4e1c\u897f\u624d\u80fd\u8ba1\u7b97\u3002<\/p>\n<p>BigInteger a &#061; new BigInteger(&#034;100&#034;);<br \/>\nBigInteger b &#061; new BigInteger(&#034;200&#034;);<\/p>\n<p>BigInteger sum &#061; a.add(b);          \/\/ \u52a0\u6cd5<br \/>\nBigInteger diff &#061; a.subtract(b);    \/\/ \u51cf\u6cd5<br \/>\nBigInteger product &#061; a.multiply(b); \/\/ \u4e58\u6cd5<br \/>\nBigInteger quotient &#061; a.divide(b);  \/\/ \u9664\u6cd5<\/p>\n<p>System.out.println(sum); \/\/ 300<\/p>\n<p>\u6ce8\u610f\u4e8b\u9879&#xff1a;<\/p>\n<ul>\n<li>\u65b9\u6cd5\u7b7e\u540d\u5f88\u5173\u952e&#xff1a;\u524d\u9762\u662f\u8fd4\u56de\u7c7b\u578b&#xff0c;\u62ec\u53f7\u91cc\u662f\u53c2\u6570\u7c7b\u578b<\/li>\n<li>\u63a5\u6536\u7ed3\u679c\u65f6\u8981\u5339\u914d\u8fd4\u56de\u7c7b\u578b&#xff08;\u5982 add() \u8fd4\u56de BigInteger \u5c31\u8981\u7528 BigInteger \u63a5\u6536&#xff09;<\/li>\n<li>\u53c2\u6570\u4f20\u9012\u5fc5\u987b\u4e25\u683c\u6309\u65b9\u6cd5\u8981\u6c42\u7684\u7c7b\u578b\u6765<\/li>\n<li>BigDecimal \u540c\u7406&#xff0c;\u6240\u6709\u8fd0\u7b97\u90fd\u901a\u8fc7\u65b9\u6cd5\u8c03\u7528\u5b9e\u73b0<\/li>\n<\/ul>\n<hr \/>\n<h3>\u7b2c\u4e09\u90e8\u5206&#xff1a;\u6570\u7ec4<\/h3>\n<h4>3.1 \u57fa\u672c\u6982\u5ff5<\/h4>\n<ul>\n<li>\u6570\u7ec4\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784&#xff0c;\u7528\u4e8e\u5b58\u50a8\u540c\u4e00\u79cd\u7c7b\u578b\u7684\u6570\u636e<\/li>\n<li>\u5143\u7d20\u5728\u5185\u5b58\u4e2d\u8fde\u7eed\u5b58\u653e<\/li>\n<li>\u8bbf\u95ee\u5143\u7d20\u901a\u8fc7\u4ece 0 \u5f00\u59cb\u7684\u4e0b\u6807<\/li>\n<li>\u58f0\u660e\u6570\u7ec4\u65f6\u5fc5\u987b\u786e\u5b9a\u957f\u5ea6&#xff08;\u8fd9\u662f\u539f\u751f\u6570\u7ec4\u7684\u7279\u70b9&#xff09;<\/li>\n<\/ul>\n<hr \/>\n<h4>3.2 \u6570\u7ec4\u521d\u59cb\u5316<\/h4>\n<p>\u591a\u79cd\u5199\u6cd5&#xff1a;<\/p>\n<p>\/\/ \u65b9\u5f0f1&#xff1a;\u58f0\u660e\u65f6\u76f4\u63a5\u8d4b\u503c<br \/>\nint[] a &#061; {1, 2, 3, 4, 5};<\/p>\n<p>\/\/ \u65b9\u5f0f2&#xff1a;new\u5173\u952e\u5b57\u521b\u5efa&#xff08;\u6307\u5b9a\u957f\u5ea6&#xff0c;\u5143\u7d20\u6709\u9ed8\u8ba4\u503c&#xff09;<br \/>\nint[] b &#061; new int[100]; \/\/ 100\u4e2a\u5143\u7d20&#xff0c;\u9ed8\u8ba4\u503c\u90fd\u662f0<\/p>\n<p>\/\/ \u65b9\u5f0f3&#xff1a;new &#043; \u8d4b\u503c<br \/>\nint[] c &#061; new int[]{5, 7, 4, 10};<\/p>\n<p>\/\/ \u533f\u540d\u6570\u7ec4&#xff08;\u4e0d\u8d4b\u503c\u7ed9\u53d8\u91cf&#xff0c;\u53ea\u80fd\u4e34\u65f6\u4f7f\u7528&#xff0c;\u7528\u5b8c\u5c31\u6254&#xff09;<br \/>\nnew int[]{1, 2, 3}; \/\/ \u5fc5\u987b\u7528new&#xff0c;\u76f4\u63a5\u7528\u62ec\u53f7\u4e0d\u884c<\/p>\n<p>\u5404\u7c7b\u578b\u7684\u9ed8\u8ba4\u521d\u59cb\u503c&#xff1a;<\/p>\n<table>\n<tr>\u7c7b\u578b\u9ed8\u8ba4\u503c<\/tr>\n<tbody>\n<tr>\n<td>int<\/td>\n<td>0<\/td>\n<\/tr>\n<tr>\n<td>double \/ float<\/td>\n<td>0.0<\/td>\n<\/tr>\n<tr>\n<td>boolean<\/td>\n<td>false<\/td>\n<\/tr>\n<tr>\n<td>String \/ \u5f15\u7528\u7c7b\u578b<\/td>\n<td>null<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6ce8\u610f&#xff1a;int[] a \u53ea\u662f\u5b9a\u4e49\u4e86\u4e00\u4e2a\u6570\u7ec4\u53d8\u91cf&#xff0c;\u53ea\u6709\u7528 new int[100] \u521d\u59cb\u5316\u540e&#xff0c;\u624d\u771f\u6b63\u521b\u5efa\u4e86\u5b58\u50a8\u7a7a\u95f4\u3002\u8981\u533a\u5206\u58f0\u660e\u548c\u5b9e\u9645\u521b\u5efa\u6570\u7ec4\u7684\u533a\u522b\u3002<\/p>\n<p>\u8865\u5145&#xff1a;Java \u63d0\u4f9b\u4e86\u66f4\u7075\u6d3b\u7684 ArrayList&#xff0c;\u5e95\u5c42\u867d\u7136\u662f\u6570\u7ec4&#xff0c;\u4f46\u80fd\u81ea\u52a8\u6269\u5bb9\u3001\u52a8\u6001\u8c03\u6574\u5927\u5c0f\u3002<\/p>\n<hr \/>\n<h4>3.3 \u6570\u7ec4\u62f7\u8d1d<\/h4>\n<h5>\u6d45\u62f7\u8d1d&#xff08;\u7b49\u53f7\u8d4b\u503c&#xff09;<\/h5>\n<p>\u672c\u8d28&#xff1a;\u4f20\u9012\u7684\u662f\u5730\u5740\u503c\u3002\u4e24\u4e2a\u53d8\u91cf\u6307\u5411\u540c\u4e00\u5757\u5185\u5b58\u7a7a\u95f4&#xff0c;\u4fee\u6539\u5176\u4e2d\u4e00\u4e2a\u4f1a\u5f71\u54cd\u53e6\u4e00\u4e2a\u3002<\/p>\n<p>int[] small &#061; {1, 2, 3};<br \/>\nint[] luckyNumbers &#061; small; \/\/ \u6d45\u62f7\u8d1d&#xff1a;\u53ea\u590d\u5236\u4e86\u5f15\u7528\u5730\u5740<\/p>\n<p>luckyNumbers[0] &#061; 99;<br \/>\nSystem.out.println(small[0]); \/\/ 99&#xff08;\u539f\u6570\u7ec4\u4e5f\u53d8\u4e86&#xff01;&#xff09;<\/p>\n<p>\u6bd4\u55bb&#xff1a;\u4e24\u4e2a\u4eba\u62ff\u7740\u540c\u4e00\u628a\u94a5\u5319\u5f00\u540c\u4e00\u4e2a\u4fdd\u9669\u7bb1&#xff0c;\u4e00\u4e2a\u4eba\u5f80\u91cc\u9762\u653e\u4e86\u4e1c\u897f&#xff0c;\u53e6\u4e00\u4e2a\u4eba\u6253\u5f00\u65f6\u81ea\u7136\u80fd\u770b\u5230\u53d8\u5316\u3002<\/p>\n<hr \/>\n<h5>\u6df1\u62f7\u8d1d&#xff08;\u521b\u5efa\u65b0\u6570\u7ec4&#xff09;<\/h5>\n<p>\u672c\u8d28&#xff1a;\u521b\u5efa\u4e00\u4e2a\u5168\u65b0\u7684\u6570\u7ec4&#xff0c;\u5c06\u6e90\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u503c\u590d\u5236\u5230\u65b0\u6570\u7ec4\u4e2d\u3002\u4e24\u4e2a\u53d8\u91cf\u6307\u5411\u72ec\u7acb\u7684\u7a7a\u95f4&#xff0c;\u4e92\u4e0d\u5f71\u54cd\u3002<\/p>\n<p>int[] arr &#061; {5, 7, 4, 10};<br \/>\nint[] brr &#061; new int[arr.length]; \/\/ \u65b0\u5f00\u8f9f\u5185\u5b58\u7a7a\u95f4<\/p>\n<p>\/\/ \u624b\u52a8\u9010\u4e2a\u590d\u5236<br \/>\nfor (int i &#061; 0; i &lt; arr.length; i&#043;&#043;) {<br \/>\n    brr[i] &#061; arr[i];<br \/>\n}<\/p>\n<p>brr[0] &#061; 99;<br \/>\nSystem.out.println(arr[0]); \/\/ 5&#xff08;\u539f\u6570\u7ec4\u4e0d\u53d7\u5f71\u54cd&#xff09;<\/p>\n<p>\u6bd4\u55bb&#xff1a;\u5c31\u50cf\u590d\u5370\u6587\u4ef6&#xff0c;\u539f\u6587\u4ef6\u548c\u590d\u5370\u4ef6\u662f\u5b8c\u5168\u72ec\u7acb\u7684\u3002<\/p>\n<hr \/>\n<h5>Arrays.copyOf() \u65b9\u6cd5&#xff08;\u5b9e\u73b0\u6df1\u62f7\u8d1d&#xff09;<\/h5>\n<p>int[] arr &#061; {5, 7, 4, 10};<br \/>\nint[] copy &#061; Arrays.copyOf(arr, arr.length); \/\/ \u53c2\u6570&#xff1a;\u6e90\u6570\u7ec4, \u62f7\u8d1d\u957f\u5ea6<\/p>\n<p>copy[0] &#061; 99;<br \/>\nSystem.out.println(arr[0]); \/\/ 5&#xff08;\u4e92\u4e0d\u5f71\u54cd&#xff0c;\u662f\u6df1\u62f7\u8d1d&#xff09;<\/p>\n<p>\u5e95\u5c42\u539f\u7406&#xff1a;<\/p>\n<ul>\n<li>\u4f20\u5165\u53c2\u657020&#xff0c;\u5c31\u4f1a\u521b\u5efa\u4e00\u4e2a\u957f\u5ea6\u4e3a20\u7684\u65b0\u6570\u7ec4&#xff0c;\u7136\u540e\u4f9d\u6b21\u590d\u5236\u539f\u6570\u7ec4\u7684\u503c<\/li>\n<li>\u5982\u679c\u539f\u6570\u7ec4\u957f\u5ea6\u4e0d\u591f&#xff0c;\u591a\u51fa\u6765\u7684\u4f4d\u7f6e\u4f1a\u81ea\u52a8\u8865\u96f6<\/li>\n<li>\u672c\u8d28\u4e0a\u548c\u624b\u52a8\u904d\u5386\u590d\u5236\u662f\u4e00\u6837\u7684<\/li>\n<\/ul>\n<hr \/>\n<h4>3.4 \u6570\u7ec4\u904d\u5386<\/h4>\n<p>int[] arr &#061; {1, 2, 3, 4, 5};<\/p>\n<p>\/\/ \u65b9\u5f0f1&#xff1a;\u666e\u901afor\u5faa\u73af&#xff08;\u5df2\u77e5\u957f\u5ea6&#xff09;<br \/>\nfor (int i &#061; 0; i &lt; arr.length; i&#043;&#043;) {<br \/>\n    System.out.println(arr[i]);<br \/>\n}<\/p>\n<p>\/\/ \u65b9\u5f0f2&#xff1a;for-each&#xff08;\u4e0d\u786e\u5b9a\u957f\u5ea6\u65f6\u66f4\u5b89\u5168&#xff09;<br \/>\nfor (int x : arr) {<br \/>\n    System.out.println(x);<br \/>\n}<\/p>\n<hr \/>\n<h4>3.5 \u547d\u4ee4\u884c\u53c2\u6570&#xff08;args&#xff09;<\/h4>\n<ul>\n<li>main \u65b9\u6cd5\u91cc\u7684 args \u53c2\u6570\u5c31\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\u6570\u7ec4&#xff0c;\u7528\u6765\u63a5\u6536\u5916\u90e8\u4f20\u5165\u7684\u53c2\u6570<\/li>\n<li>\u5728 IDE \u91cc\u76f4\u63a5\u8fd0\u884c\u65f6&#xff0c;args \u662f\u7a7a\u7684<\/li>\n<li>\u901a\u8fc7\u547d\u4ee4\u884c\u6267\u884c jar \u5305\u65f6&#xff0c;\u53ef\u4ee5\u5728\u547d\u4ee4\u540e\u9762\u6dfb\u52a0\u53c2\u6570\u4f20\u5165<\/li>\n<li>\u4e0d\u77e5\u9053 args \u6709\u591a\u957f\u65f6&#xff0c;\u7528 for-each \u904d\u5386\u6700\u65b9\u4fbf<\/li>\n<\/ul>\n<p>\/\/ \u904d\u5386\u547d\u4ee4\u884c\u53c2\u6570<br \/>\nfor (String a : args) {<br \/>\n    System.out.println(a);<br \/>\n}<\/p>\n<hr \/>\n<h4>3.6 Arrays \u7c7b\u5e38\u7528\u65b9\u6cd5<\/h4>\n<table>\n<tr>\u65b9\u6cd5\u529f\u80fd\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>Arrays.sort(arr)<\/td>\n<td>\u6392\u5e8f<\/td>\n<td>\u5e95\u5c42\u91c7\u7528\u5feb\u901f\u6392\u5e8f\u7b97\u6cd5&#xff0c;\u9ed8\u8ba4\u4ece\u5c0f\u5230\u5927<\/td>\n<\/tr>\n<tr>\n<td>Arrays.toString(arr)<\/td>\n<td>\u8f6c\u4e3a\u5b57\u7b26\u4e32<\/td>\n<td>\u65b9\u4fbf\u6253\u5370\u6570\u7ec4\u5185\u5bb9<\/td>\n<\/tr>\n<tr>\n<td>Arrays.fill(arr, val)<\/td>\n<td>\u586b\u5145<\/td>\n<td>\u628a\u6240\u6709\u5143\u7d20\u6279\u91cf\u4fee\u6539\u4e3a\u6307\u5b9a\u503c<\/td>\n<\/tr>\n<tr>\n<td>Arrays.equals(arr1, arr2)<\/td>\n<td>\u6bd4\u8f83<\/td>\n<td>\u6bd4\u8f83\u4e24\u4e2a\u6570\u7ec4\u5185\u5bb9\u662f\u5426\u76f8\u540c<\/td>\n<\/tr>\n<tr>\n<td>Arrays.copyOf(arr, len)<\/td>\n<td>\u6df1\u62f7\u8d1d<\/td>\n<td>\u521b\u5efa\u65b0\u6570\u7ec4\u5e76\u590d\u5236\u5143\u7d20<\/td>\n<\/tr>\n<tr>\n<td>Arrays.binarySearch(arr, key)<\/td>\n<td>\u4e8c\u5206\u67e5\u627e<\/td>\n<td>\u9700\u4f20\u5165\u8d77\u59cb\u548c\u7ed3\u675f\u4e0b\u6807<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u4ee3\u7801\u6f14\u793a&#xff1a;<\/p>\n<p>int[] arr &#061; {4, 1, 3, 2};<\/p>\n<p>\/\/ \u6392\u5e8f&#xff08;\u4ece\u5c0f\u5230\u5927&#xff09;<br \/>\nArrays.sort(arr);<br \/>\nSystem.out.println(Arrays.toString(arr)); \/\/ [1, 2, 3, 4]<\/p>\n<p>\/\/ \u586b\u5145<br \/>\nArrays.fill(arr, 1);<br \/>\nSystem.out.println(Arrays.toString(arr)); \/\/ [1, 1, 1, 1]<\/p>\n<p>\/\/ \u6bd4\u8f83&#xff08;\u6bd4\u8f83\u5185\u5bb9&#xff0c;\u4e0d\u662f\u5730\u5740&#xff09;<br \/>\nint[] a &#061; {1, 2, 3};<br \/>\nint[] b &#061; {1, 2, 3};<br \/>\nSystem.out.println(a &#061;&#061; b);            \/\/ false&#xff08;\u5730\u5740\u4e0d\u540c&#xff09;<br \/>\nSystem.out.println(Arrays.equals(a, b)); \/\/ true&#xff08;\u5185\u5bb9\u76f8\u540c&#xff09;<\/p>\n<p>\u26a0\ufe0f \u91cd\u70b9&#xff1a;<\/p>\n<ul>\n<li>\u76f4\u63a5\u7528 &#061;&#061; \u6bd4\u8f83\u4e24\u4e2a\u6570\u7ec4\u5224\u65ad\u7684\u662f\u5185\u5b58\u5730\u5740\u662f\u5426\u76f8\u540c&#xff0c;\u5f80\u5f80\u4e0d\u662f\u6211\u4eec\u60f3\u8981\u7684\u7ed3\u679c<\/li>\n<li>\u6b63\u786e\u505a\u6cd5\u662f\u8c03\u7528 Arrays.equals()&#xff0c;\u5b83\u91cd\u5199\u4e86 equals \u65b9\u6cd5&#xff0c;\u6bd4\u8f83\u7684\u662f\u5b9e\u9645\u5185\u5bb9<\/li>\n<li>\u56e0\u4e3a\u662f static \u65b9\u6cd5&#xff0c;\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u7c7b\u540d Arrays \u8c03\u7528&#xff0c;\u4e0d\u9700\u8981\u521b\u5efa\u5bf9\u8c61<\/li>\n<li>\u53ea\u8981\u4e24\u4e2a\u6570\u7ec4\u7684\u4e0b\u6807\u548c\u5bf9\u5e94\u503c\u5b8c\u5168\u76f8\u540c&#xff0c;\u5c31\u5224\u5b9a\u4e3a\u76f8\u7b49<\/li>\n<\/ul>\n<p>\u4ece\u5927\u5230\u5c0f\u6392\u5e8f&#xff1a;Java \u6ca1\u6709\u76f4\u63a5\u7684\u4ece\u5927\u5230\u5c0f sort \u65b9\u6cd5&#xff0c;\u53ef\u4ee5\u7528\u5faa\u73af\u5012\u5e8f\u904d\u5386\u6765\u5b9e\u73b0\u3002\u5b9e\u9645\u7f16\u7a0b\u4e2d\u4ece\u5c0f\u5230\u5927\u6392\u5e8f\u66f4\u5e38\u7528\u3002<\/p>\n<hr \/>\n<h3>\u7b2c\u56db\u90e8\u5206&#xff1a;\u591a\u7ef4\u6570\u7ec4<\/h3>\n<h4>4.1 \u57fa\u672c\u6982\u5ff5<\/h4>\n<ul>\n<li>\u591a\u7ef4\u6570\u7ec4\u672c\u8d28\u4e0a\u5c31\u662f\u4e00\u7ef4\u6570\u7ec4\u7684\u5d4c\u5957<\/li>\n<li>\u4e00\u7ef4\u6570\u7ec4\u91cc\u5b58\u653e\u6570\u7ec4 \u2192 \u4e8c\u7ef4\u6570\u7ec4<\/li>\n<li>\u4e8c\u7ef4\u6570\u7ec4\u91cc\u518d\u5d4c\u5957\u6570\u7ec4 \u2192 \u4e09\u7ef4\u6570\u7ec4&#xff0c;\u4ee5\u6b64\u7c7b\u63a8<\/li>\n<li>\u5c31\u50cf\u4fc4\u7f57\u65af\u5957\u5a03&#xff1a;\u5916\u5c42\u662f\u5bb9\u5668&#xff0c;\u5185\u5c42\u624d\u662f\u5b9e\u9645\u5185\u5bb9<\/li>\n<\/ul>\n<hr \/>\n<h4>4.2 \u5185\u5b58\u7ed3\u6784<\/h4>\n<ul>\n<li>\u4e8c\u7ef4\u6570\u7ec4\u5728\u5185\u5b58\u4e2d\u5e76\u975e\u5b8c\u5168\u8fde\u7eed\u5b58\u50a8<\/li>\n<li>\u53ea\u6709\u6bcf\u4e2a\u5b50\u6570\u7ec4\u5185\u90e8\u662f\u8fde\u7eed\u5b58\u653e\u7684<\/li>\n<li>\u5916\u58f3\u6570\u7ec4\u5b58\u50a8\u7684\u662f\u5404\u4e2a\u5b50\u6570\u7ec4\u7684\u5730\u5740\u5f15\u7528<\/li>\n<li>\u5b50\u6570\u7ec4\u91cc\u76f4\u63a5\u5b58\u653e\u5177\u4f53\u6570\u503c<\/li>\n<\/ul>\n<p>\u6570\u7ec4\u957f\u5ea6&#xff1a;\u7531\u6700\u5916\u5c42\u5143\u7d20\u6570\u91cf\u51b3\u5b9a\u3002\u6bd4\u5982\u5916\u58f3\u6570\u7ec4\u5305\u542b4\u4e2a\u5b50\u6570\u7ec4&#xff0c;\u957f\u5ea6\u5c31\u662f4\u3002<\/p>\n<hr \/>\n<h4>4.3 \u8bbf\u95ee\u65b9\u5f0f<\/h4>\n<p>\u901a\u8fc7\u591a\u5c42\u4e0b\u6807\u8bbf\u95ee\u5143\u7d20&#xff0c;\u50cf\u5265\u6d0b\u8471\u4e00\u6837\u5c42\u5c42\u6df1\u5165&#xff1a;<\/p>\n<p>int[][] arr &#061; {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};<\/p>\n<p>\/\/ arr[i][j]&#xff1a;i\u662f\u5916\u5c42\u6570\u7ec4\u7684\u7d22\u5f15&#xff0c;j\u662f\u5185\u5c42\u6570\u7ec4\u7684\u7d22\u5f15<br \/>\nSystem.out.println(arr[1][2]); \/\/ 6&#xff08;\u7b2c2\u4e2a\u5b50\u6570\u7ec4\u7684\u7b2c3\u4e2a\u5143\u7d20&#xff09;<\/p>\n<hr \/>\n<h4>4.4 \u904d\u5386&#xff08;\u53cc\u91cd for-each&#xff09;<\/h4>\n<p>for-each \u5faa\u73af\u53ea\u80fd\u5904\u7406\u4e00\u7ef4\u6570\u7ec4&#xff0c;\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4\u9700\u8981\u5d4c\u5957\u5faa\u73af&#xff1a;<\/p>\n<p>int[][] arr &#061; {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};<\/p>\n<p>\/\/ \u5916\u5c42\u5faa\u73af&#xff1a;i\u4f9d\u6b21\u4ee3\u8868\u6bcf\u4e2a\u5b50\u6570\u7ec4&#xff08;i\u672c\u8eab\u53c8\u662f\u4e00\u4e2a\u6570\u7ec4&#xff09;<br \/>\nfor (int[] i : arr) {<br \/>\n    \/\/ \u5185\u5c42\u5faa\u73af&#xff1a;\u5904\u7406\u5b50\u6570\u7ec4\u91cc\u7684\u6bcf\u4e2a\u5143\u7d20<br \/>\n    for (int j : i) {<br \/>\n        System.out.print(j &#043; &#034; &#034;);<br \/>\n    }<br \/>\n    System.out.println();<br \/>\n}<br \/>\n\/\/ \u8f93\u51fa:<br \/>\n\/\/ 1 2 3<br \/>\n\/\/ 4 5 6<br \/>\n\/\/ 7 8 9<\/p>\n<p>\u4e09\u7ef4\u6570\u7ec4\u540c\u7406&#xff0c;\u65e0\u975e\u662f\u591a\u5957\u4e00\u5c42\u5faa\u73af\u3002<\/p>\n<hr \/>\n<h4>4.5 \u4e0d\u89c4\u5219\u6570\u7ec4<\/h4>\n<p>\u5b9a\u4e49&#xff1a;\u5185\u5c42\u6570\u7ec4\u957f\u5ea6\u4e0d\u4e00\u81f4\u7684\u4e8c\u7ef4\u6570\u7ec4\u3002<\/p>\n<p>\u539f\u7406&#xff1a;\u5b58\u50a8\u7684\u662f\u6307\u5411\u4e0d\u540c\u957f\u5ea6\u6570\u7ec4\u7684\u5730\u5740&#xff0c;\u6240\u4ee5\u6bcf\u884c\u957f\u5ea6\u53ef\u4ee5\u4e0d\u540c\u3002<\/p>\n<p>\/\/ \u4e09\u89d2\u5f62\u7ed3\u6784&#xff1a;\u7b2c1\u884c\u957f\u5ea61&#xff0c;\u7b2c2\u884c\u957f\u5ea62&#xff0c;\u7b2c3\u884c\u957f\u5ea63<br \/>\nint[][] triangle &#061; {<br \/>\n    {1},<br \/>\n    {2, 3},<br \/>\n    {4, 5, 6}<br \/>\n};<\/p>\n<p>\/\/ \u904d\u5386&#xff08;\u540c\u6837\u7528\u53cc\u91cdfor-each&#xff0c;\u81ea\u52a8\u9002\u914d\u4e0d\u540c\u957f\u5ea6&#xff09;<br \/>\nfor 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