{"id":134052,"date":"2024-04-28T11:49:08","date_gmt":"2024-04-28T03:49:08","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/134052.html"},"modified":"2024-04-28T11:49:10","modified_gmt":"2024-04-28T03:49:10","slug":"java%e4%ba%8c%e7%bb%b4%e6%95%b0%e7%bb%84%e6%80%8e%e4%b9%88%e7%94%a8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/134052.html","title":{"rendered":"java\u4e8c\u7ef4\u6570\u7ec4\u600e\u4e48\u7528"},"content":{"rendered":"<p style=\"text-align:center\"><img decoding=\"async\" src=\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/24131939\/3c680aff-1fc4-40cf-ab6f-2553688900df.webp\" alt=\"java\u4e8c\u7ef4\u6570\u7ec4\u600e\u4e48\u7528\" \/><\/p>\n<p><p>Java \u4e8c\u7ef4\u6570\u7ec4\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u4ee5\u8868\u683c\u5f62\u5f0f\u5b58\u50a8\u6570\u636e\uff0c\u7c7b\u4f3c\u4e8e\u77e9\u9635\u3002\u4e3b\u8981\u7528\u4e8e\u5904\u7406\u7c7b\u4f3c\u4e8e\u884c\u548c\u5217\u7684\u6570\u636e\u96c6\uff0c<strong>\u4f8b\u5982\uff0c\u53ef\u4ee5\u7528\u4e8e\u5b58\u50a8\u77e9\u9635\u6570\u636e\u3001\u6e38\u620f\u5730\u56fe\u3001\u7535\u5b50\u8868\u683c\u6570\u636e\u548c\u66f4\u591a\u7c7b\u578b<\/strong>\u3002\u4e8c\u7ef4\u6570\u7ec4\u4e0d\u4ec5\u589e\u5f3a\u4e86\u6570\u636e\u7ba1\u7406\u7684\u80fd\u529b\uff0c\u8fd8\u63d0\u4f9b\u4e86\u4fbf\u6377\u7684\u6570\u636e\u64cd\u4f5c\u65b9\u5f0f\u3002\u5176\u4e2d\uff0c<strong>\u5bf9\u4e8c\u7ef4\u6570\u7ec4\u7684\u521d\u59cb\u5316\u548c\u904d\u5386\u5c24\u4e3a\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u4eec\u6784\u6210\u4e86\u4f7f\u7528\u4e8c\u7ef4\u6570\u7ec4\u65f6\u7684\u57fa\u7840\u64cd\u4f5c\u3002<\/strong><\/p>\n<\/p>\n<p><p>\u5728\u8ba8\u8bba\u4e8c\u7ef4\u6570\u7ec4\u7684\u4f7f\u7528\u524d\uff0c\u5148\u5f3a\u8c03\uff0c\u4ece\u96f6\u5f00\u59cb\u7406\u89e3\u4e8c\u7ef4\u6570\u7ec4\u7684\u6982\u5ff5\u5bf9\u638c\u63e1\u5176\u5e94\u7528\u81f3\u5173\u91cd\u8981\u3002\u4e8c\u7ef4\u6570\u7ec4\u7531\u884c\u548c\u5217\u7ec4\u6210\uff0c\u53ef\u4ee5\u89c6\u4e3a\u201c\u6570\u7ec4\u7684\u6570\u7ec4\u201d\u3002\u7406\u89e3\u8fd9\u4e00\u70b9\uff0c\u6709\u52a9\u4e8e\u5feb\u901f\u638c\u63e1\u4e8c\u7ef4\u6570\u7ec4\u7684\u7d22\u5f15\u65b9\u5f0f\uff0c\u4ee5\u4fbf\u9ad8\u6548\u5730\u5b58\u53d6\u6570\u636e\u3002<\/p>\n<\/p>\n<p><h3>\u4e00\u3001\u4e8c\u7ef4\u6570\u7ec4\u7684\u58f0\u660e\u548c\u521d\u59cb\u5316<\/h3>\n<\/p>\n<p><p>\u5728Java\u4e2d\uff0c\u4e8c\u7ef4\u6570\u7ec4\u7684\u58f0\u660e\u6709\u591a\u79cd\u65b9\u5f0f\u3002\u4e00\u79cd\u662f\u4f7f\u7528\u4e24\u5bf9\u65b9\u62ec\u53f7\uff08<code>[][]<\/code>\uff09\uff0c\u53e6\u4e00\u79cd\u5219\u662f\u901a\u8fc7\u5355\u4e2a\u65b9\u62ec\u53f7\u5185\u4f7f\u7528\u9017\u53f7\u5206\u9694\uff08<code>[,]<\/code>\uff09\uff0c\u5c3d\u7ba1\u540e\u8005\u5728Java\u4e2d\u4e0d\u662f\u6807\u51c6\u8bed\u6cd5\uff0c\u4f46\u4e86\u89e3\u591a\u79cd\u7f16\u7a0b\u8bed\u8a00\u7684\u6570\u7ec4\u58f0\u660e\u65b9\u5f0f\u662f\u6709\u76ca\u7684\u3002<\/p>\n<\/p>\n<p><h4>\u6570\u7ec4\u7684\u9759\u6001\u521d\u59cb\u5316<\/h4>\n<\/p>\n<p><p>\u5bf9\u4e8e\u4e8c\u7ef4\u6570\u7ec4\u7684\u9759\u6001\u521d\u59cb\u5316\uff0c\u53ef\u4ee5\u5728\u58f0\u660e\u6570\u7ec4\u65f6\u76f4\u63a5\u6307\u5b9a\u6bcf\u4e2a\u5143\u7d20\u7684\u503c\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u5408\u5df2\u77e5\u6240\u6709\u6570\u7ec4\u5143\u7d20\u503c\u7684\u60c5\u51b5\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">int[][] matrix = {<\/p>\n<p>  {1, 2, 3},<\/p>\n<p>  {4, 5, 6},<\/p>\n<p>  {7, 8, 9}<\/p>\n<p>};<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u4ee5\u4e0a\u4ee3\u7801\u521d\u59cb\u5316\u4e86\u4e00\u4e2a3&#215;3\u7684\u6574\u578b\u6570\u7ec4 <code>matrix<\/code>\uff0c\u5e76\u4e14\u5df2\u7ecf\u8d4b\u503c\u3002\u8fd9\u79cd\u65b9\u5f0f\u7b80\u6d01\u660e\u4e86\uff0c\u975e\u5e38\u9002\u7528\u4e8e\u5728\u7f16\u5199\u7a0b\u5e8f\u65f6\u5df2\u7ecf\u660e\u786e\u4e86\u6570\u7ec4\u4e2d\u6240\u6709\u5143\u7d20\u7684\u503c\u3002<\/p>\n<\/p>\n<p><h4>\u52a8\u6001\u521d\u59cb\u5316<\/h4>\n<\/p>\n<p><p>\u52a8\u6001\u521d\u59cb\u5316\u662f\u5728\u58f0\u660e\u6570\u7ec4\u65f6\u672a\u76f4\u63a5\u6307\u5b9a\u6bcf\u4e2a\u5143\u7d20\u7684\u503c\uff0c\u800c\u662f\u9884\u7559\u4e86\u7a7a\u95f4\uff0c\u5f85\u540e\u7eed\u64cd\u4f5c\u4e2d\u8d4b\u503c\u3002\u8fd9\u79cd\u65b9\u6cd5\u66f4\u52a0\u7075\u6d3b\uff0c\u53ef\u4ee5\u6839\u636e\u5b9e\u9645\u9700\u8981\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u786e\u5b9a\u6bcf\u4e2a\u5143\u7d20\u7684\u503c\u3002\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<\/p>\n<p><pre><code class=\"language-java\">int[][] dynamicArray = new int[3][4];<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u8be5\u793a\u4f8b\u521b\u5efa\u4e86\u4e00\u4e2a3\u884c4\u5217\u7684\u4e8c\u7ef4\u6570\u7ec4 <code>dynamicArray<\/code>\uff0c\u6240\u6709\u5143\u7d20\u9ed8\u8ba4\u521d\u59cb\u5316\u4e3a0\u3002\u63a5\u4e0b\u6765\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u8981\u4f7f\u7528\u5faa\u73af\u6216\u5176\u4ed6\u903b\u8f91\u64cd\u4f5c\u6765\u586b\u5145\u6570\u7ec4\u3002<\/p>\n<\/p>\n<p><h3>\u4e8c\u3001\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4<\/h3>\n<\/p>\n<p><p>\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4\u662f\u4e8c\u7ef4\u6570\u7ec4\u5e38\u89c1\u7684\u64cd\u4f5c\u4e4b\u4e00\uff0c\u901a\u5e38\u7528\u4e8e\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u3002\u4e3b\u8981\u6709\u4e24\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528\u4f20\u7edf\u7684 <code>for<\/code> \u5faa\u73af\u548c\u4f7f\u7528\u589e\u5f3a <code>for<\/code> \u5faa\u73af\uff08\u4e5f\u79f0\u4e3a&quot;foreach&quot;\u5faa\u73af\uff09\u3002<\/p>\n<\/p>\n<p><p><strong>\u4f20\u7edf\u7684 <code>for<\/code> \u5faa\u73af\u9002\u7528\u4e8e\u9700\u8981\u7d22\u5f15\u503c\u8fdb\u884c\u64cd\u4f5c\u65f6<\/strong>\uff0c\u4f8b\u5982\uff0c\u5f53\u4f60\u9700\u8981\u6839\u636e\u884c\u5217\u4f4d\u7f6e\u66f4\u65b0\u6570\u7ec4\u5143\u7d20\u7684\u503c\u3002\u800c<strong>\u589e\u5f3a <code>for<\/code> \u5faa\u73af\u5219\u9002\u5408\u4ec5\u9700\u8bbf\u95ee\u5143\u7d20\u503c\u65f6<\/strong>\uff0c\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3002<\/p>\n<\/p>\n<p><h4>\u4f7f\u7528\u4f20\u7edf <code>for<\/code> \u5faa\u73af<\/h4>\n<\/p>\n<p><pre><code class=\"language-java\">for (int i = 0; i &lt; matrix.length; i++) {<\/p>\n<p>    for (int j = 0; j &lt; matrix[i].length; j++) {<\/p>\n<p>        System.out.print(matrix[i][j] + &quot; &quot;);<\/p>\n<p>    }<\/p>\n<p>    System.out.println();<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u901a\u8fc7\u4e24\u5c42\u5faa\u73af\u904d\u5386\u4e86 <code>matrix<\/code> \u6570\u7ec4\u7684\u6240\u6709\u5143\u7d20\uff0c\u5e76\u6253\u5370\u51fa\u6765\u3002\u5916\u5c42\u5faa\u73af\u904d\u5386\u884c\uff0c\u5185\u5c42\u5faa\u73af\u904d\u5386\u5217\u3002<\/p>\n<\/p>\n<p><h4>\u4f7f\u7528\u589e\u5f3a <code>for<\/code> \u5faa\u73af<\/h4>\n<\/p>\n<p><pre><code class=\"language-java\">for (int[] row : matrix) {<\/p>\n<p>    for (int element : row) {<\/p>\n<p>        System.out.print(element + &quot; &quot;);<\/p>\n<p>    }<\/p>\n<p>    System.out.println();<\/p>\n<p>}<\/p>\n<p><\/code><\/pre>\n<\/p>\n<p><p>\u589e\u5f3a <code>for<\/code> \u5faa\u73af\u7b80\u5316\u4e86\u904d\u5386\u7684\u8bed\u6cd5\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u6e05\u6670\u3002\u9996\u5148\u904d\u5386\u884c\uff0c\u7136\u540e\u5728\u6bcf\u4e00\u884c\u4e2d\u904d\u5386\u5143\u7d20\u3002<\/p>\n<\/p>\n<p><h3>\u4e09\u3001\u4e8c\u7ef4\u6570\u7ec4\u7684\u5e94\u7528<\/h3>\n<\/p>\n<p><p>\u4e8c\u7ef4\u6570\u7ec4\u5728\u5404\u79cd\u7a0b\u5e8f\u8bbe\u8ba1\u4e2d\u90fd\u6709\u5e7f\u6cdb\u5e94\u7528\uff0c<strong>\u5c24\u5176\u662f\u5728\u9700\u8981\u5904\u7406\u8868\u683c\u6570\u636e\u6216\u77e9\u9635\u8fd0\u7b97\u65f6<\/strong>\u3002<\/p>\n<\/p>\n<p><h4>\u77e9\u9635\u8fd0\u7b97<\/h4>\n<\/p>\n<p><p>\u5bf9\u4e8e\u7ebf\u6027\u4ee3\u6570\u4e2d\u7684\u77e9\u9635\u8fd0\u7b97\uff0c\u5982\u77e9\u9635\u4e58\u6cd5\u3001\u6c42\u9006\u7b49\uff0c\u4e8c\u7ef4\u6570\u7ec4\u63d0\u4f9b\u4e86\u826f\u597d\u7684\u6570\u636e\u7ed3\u6784\u652f\u6301\u3002\u901a\u8fc7\u5d4c\u5957\u5faa\u73af\u548c\u76f8\u5e94\u7b97\u6cd5\uff0c\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e9b\u8fd0\u7b97\u3002<\/p>\n<\/p>\n<p><h4>\u6e38\u620f\u5f00\u53d1<\/h4>\n<\/p>\n<p><p>\u5728\u6e38\u620f\u5f00\u53d1\u4e2d\uff0c\u4e8c\u7ef4\u6570\u7ec4\u5e38\u7528\u4e8e\u8868\u793a\u6e38\u620f\u5730\u56fe\u3001\u5b58\u50a8\u6e38\u620f\u89d2\u8272\u4f4d\u7f6e\u7b49\u3002\u4f8b\u5982\uff0c\u68cb\u76d8\u7c7b\u6e38\u620f\u3001\u8ff7\u5bab\u6e38\u620f\u7b49\u90fd\u53ef\u4ee5\u7528\u4e8c\u7ef4\u6570\u7ec4\u6765\u6784\u5efa\u6e38\u620f\u903b\u8f91\u3002<\/p>\n<\/p>\n<p><h3>\u56db\u3001\u5c0f\u7ed3<\/h3>\n<\/p>\n<p><p>Java\u4e2d\u7684\u4e8c\u7ef4\u6570\u7ec4\u662f\u5904\u7406\u591a\u7ef4\u6570\u636e\u7684\u5f3a\u5927\u5de5\u5177\uff0c\u901a\u8fc7\u5408\u7406\u4f7f\u7528\uff0c\u53ef\u4ee5\u5728\u8bb8\u591a\u9886\u57df\u4e2d\u7b80\u5316\u6570\u636e\u7ba1\u7406\u548c\u64cd\u4f5c\u3002\u4ece\u6570\u7ec4\u7684\u58f0\u660e\u548c\u521d\u59cb\u5316\u5230\u904d\u5386\u548c\u5e94\u7528\uff0c\u7406\u89e3\u8fd9\u4e9b\u57fa\u672c\u6982\u5ff5\u548c\u6280\u5de7\u5bf9\u4e8e\u6709\u6548\u4f7f\u7528\u4e8c\u7ef4\u6570\u7ec4\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<\/p>\n<p><p>\u65e0\u8bba\u662f\u5728\u7b97\u6cd5\u8bbe\u8ba1\u3001\u6570\u636e\u5904\u7406\u8fd8\u662f\u6e38\u620f\u5f00\u53d1\u7b49\u9886\u57df\uff0c\u719f\u6089\u4e8c\u7ef4\u6570\u7ec4\u7684\u64cd\u4f5c\u90fd\u5c06\u5927\u5927\u63d0\u9ad8\u7a0b\u5e8f\u7684\u7075\u6d3b\u6027\u548c\u6548\u7387\u3002\u56e0\u6b64\uff0c\u6295\u5165\u65f6\u95f4\u5b66\u4e60\u548c\u7ec3\u4e60\u4e8c\u7ef4\u6570\u7ec4\u7684\u4f7f\u7528\uff0c\u5c06\u5bf9\u4f60\u7684\u7f16\u7a0b\u6280\u80fd\u6709\u7740\u957f\u8fdc\u7684\u5f71\u54cd\u3002<\/p>\n<\/p>\n<h2><strong>\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n<p><strong>1. \u5982\u4f55\u58f0\u660e\u548c\u521d\u59cb\u5316\u4e00\u4e2a\u4e8c\u7ef4\u6570\u7ec4\uff1f<\/strong><br \/>\n\u58f0\u660e\u4e00\u4e2a\u4e8c\u7ef4\u6570\u7ec4\u9700\u8981\u6307\u5b9a\u884c\u6570\u548c\u5217\u6570\uff0c\u5e76\u4f7f\u7528new\u5173\u952e\u5b57\u6765\u5206\u914d\u5185\u5b58\u3002\u4f8b\u5982\uff0cint[][] arr = new int[3][2]\uff0c\u8fd9\u5c06\u521b\u5efa\u4e00\u4e2a\u5305\u542b3\u884c2\u5217\u7684\u6574\u578b\u6570\u7ec4\u3002<\/p>\n<p><strong>2. \u5982\u4f55\u901a\u8fc7\u5faa\u73af\u6765\u8bbf\u95ee\u4e8c\u7ef4\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff1f<\/strong><br \/>\n\u53ef\u4ee5\u4f7f\u7528\u5d4c\u5957\u7684for\u5faa\u73af\u6765\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4\u7684\u6240\u6709\u5143\u7d20\u3002\u5916\u5c42\u5faa\u73af\u63a7\u5236\u884c\u6570\uff0c\u5185\u5c42\u5faa\u73af\u63a7\u5236\u5217\u6570\u3002\u901a\u8fc7\u7d22\u5f15 arr[i][j] \u6765\u8bbf\u95ee\u7279\u5b9a\u4f4d\u7f6e\u7684\u5143\u7d20\uff0c\u5176\u4e2d i \u548c j \u5206\u522b\u6307\u5b9a\u884c\u548c\u5217\u7684\u7d22\u5f15\u3002<\/p>\n<p><strong>3. \u5982\u4f55\u5728\u65b9\u6cd5\u4e2d\u4f20\u9012\u548c\u8fd4\u56de\u4e8c\u7ef4\u6570\u7ec4\uff1f<\/strong><br \/>\n\u53ef\u4ee5\u5c06\u4e8c\u7ef4\u6570\u7ec4\u4f5c\u4e3a\u65b9\u6cd5\u53c2\u6570\u4f20\u9012\u6216\u8fd4\u56de\u3002\u5728\u65b9\u6cd5\u7684\u53c2\u6570\u5217\u8868\u4e2d\uff0c\u53ef\u4ee5\u6307\u5b9a\u4e8c\u7ef4\u6570\u7ec4\u7684\u7c7b\u578b\uff0c\u4f8b\u5982\uff1apublic void methodName(int[][] arr)\u3002\u5728\u65b9\u6cd5\u5185\u90e8\uff0c\u53ef\u4ee5\u7f16\u5199\u9002\u5f53\u7684\u903b\u8f91\u6765\u5904\u7406\u548c\u64cd\u4f5c\u4e8c\u7ef4\u6570\u7ec4\u3002\u8981\u8fd4\u56de\u4e00\u4e2a\u4e8c\u7ef4\u6570\u7ec4\uff0c\u53ef\u4ee5\u5c06\u5176\u58f0\u660e\u4e3a\u65b9\u6cd5\u7684\u8fd4\u56de\u7c7b\u578b\uff0c\u5e76\u4f7f\u7528return\u8bed\u53e5\u8fd4\u56de\u6570\u7ec4\u7684\u5f15\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Java 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