{"id":64897,"date":"2026-01-24T09:48:24","date_gmt":"2026-01-24T01:48:24","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/64897.html"},"modified":"2026-01-24T09:48:24","modified_gmt":"2026-01-24T01:48:24","slug":"java%e4%bd%9c%e7%94%a8%e5%9f%9f%e5%af%b9%e4%bb%a3%e7%a0%81%e7%9a%84%e5%8f%af%e7%bb%b4%e6%8a%a4%e6%80%a7%e5%92%8c%e5%8f%af%e8%af%bb%e6%80%a7%e6%9c%89%e4%bb%80%e4%b9%88%e5%bd%b1%e5%93%8d%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/64897.html","title":{"rendered":"java\u4f5c\u7528\u57df\u5bf9\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u8bfb\u6027\u6709\u4ec0\u4e48\u5f71\u54cd\uff1f"},"content":{"rendered":"<h4>\u4f5c\u7528\u57df\u5bf9\u4ee3\u7801\u53ef\u7ef4\u62a4\u6027 &amp; \u53ef\u8bfb\u6027\u7684\u6838\u5fc3\u5f71\u54cd<\/h4>\n<p>\u4f5c\u7528\u57df\u672c\u8d28\u662f\u7ed9\u7a0b\u5e8f\u5143\u7d20&#xff08;\u53d8\u91cf\u3001\u65b9\u6cd5\u7b49&#xff09;\u5212\u5b9a \u201c\u8bbf\u95ee\u8fb9\u754c\u201d&#xff0c;\u8fd9\u4e2a\u8fb9\u754c\u7684\u5408\u7406\u6027\u76f4\u63a5\u51b3\u5b9a\u4ee3\u7801\u662f\u5426\u5bb9\u6613\u7406\u89e3\u3001\u4fee\u6539\u548c\u6392\u67e5\u95ee\u9898&#xff0c;\u5177\u4f53\u5f71\u54cd\u4f53\u73b0\u5728\u4ee5\u4e0b\u65b9\u9762&#xff1a;<\/p>\n<h5>1. \u4f5c\u7528\u57df\u8d8a\u5c0f&#xff0c;\u53ef\u8bfb\u6027\u8d8a\u597d<\/h5>\n<ul>\n<li>\u6838\u5fc3\u903b\u8f91&#xff1a;\u53d8\u91cf \/ \u65b9\u6cd5\u7684\u4f5c\u7528\u57df\u8d8a\u5c0f&#xff0c;\u5f00\u53d1\u8005\u5b9a\u4f4d\u5b83\u7684 \u201c\u4e0a\u4e0b\u6587\u8303\u56f4\u201d \u5c31\u8d8a\u7a84&#xff0c;\u4e0d\u7528\u5728\u6574\u4e2a\u7c7b \/ \u9879\u76ee\u91cc\u627e\u5b83\u7684\u5b9a\u4e49\u548c\u4f7f\u7528\u4f4d\u7f6e\u3002<\/li>\n<li>\u6b63\u9762\u4f8b\u5b50&#xff1a;\n<p>java<\/p>\n<p>\u8fd0\u884c<\/p>\n<p>public void calculateSum() {<br \/>\n    \/\/ \u5c40\u90e8\u53d8\u91cf&#xff1a;\u4ec5\u5728\u8be5\u65b9\u6cd5\u5185\u751f\u6548&#xff0c;\u8bfb\u8005\u4e00\u773c\u77e5\u9053\u5b83\u7684\u7528\u9014\u548c\u8303\u56f4<br \/>\n    int sum &#061; 0;<br \/>\n    for (int i &#061; 1; i &lt;&#061; 10; i&#043;&#043;) { \/\/ i\u4ec5\u5728\u5faa\u73af\u5185\u751f\u6548&#xff0c;\u65e0\u5197\u4f59<br \/>\n        sum &#043;&#061; i;<br \/>\n    }<br \/>\n    System.out.println(sum);<br \/>\n}<\/p>\n<p>\u8bfb\u8005\u770b\u5230sum\u548ci\u65f6&#xff0c;\u7acb\u523b\u77e5\u9053\u5b83\u4eec\u53ea\u670d\u52a1\u4e8e \u201c\u8ba1\u7b97 1-10 \u7684\u548c\u201d \u8fd9\u4e2a\u5c0f\u529f\u80fd&#xff0c;\u65e0\u9700\u5173\u6ce8\u5176\u4ed6\u4ee3\u7801\u3002<\/li>\n<li>\u53cd\u9762\u4f8b\u5b50&#xff1a;\n<p>java<\/p>\n<p>\u8fd0\u884c<\/p>\n<p>\/\/ \u628a\u4ec5\u7528\u4e8ecalculateSum\u7684\u53d8\u91cf\u5b9a\u4e49\u4e3a\u7c7b\u7ea7&#xff0c;\u6269\u5927\u4e86\u65e0\u610f\u4e49\u7684\u4f5c\u7528\u57df<br \/>\npublic class Demo {<br \/>\n    private int sum &#061; 0;<br \/>\n    private int i &#061; 0;<\/p>\n<p>    public void calculateSum() {<br \/>\n        for (i &#061; 1; i &lt;&#061; 10; i&#043;&#043;) {<br \/>\n            sum &#043;&#061; i;<br \/>\n        }<br \/>\n        System.out.println(sum);<br \/>\n    }<\/p>\n<p>    \/\/ \u5176\u4ed6\u65b9\u6cd5\u53ef\u80fd\u8bef\u4fee\u6539sum\/i&#xff0c;\u8bfb\u8005\u4e5f\u9700\u7ffb\u904d\u6574\u4e2a\u7c7b\u627esum\/i\u7684\u4f7f\u7528\u573a\u666f<br \/>\n    public void otherMethod() {<br \/>\n        sum &#061; 0; \/\/ \u65e0\u610f\u4e49\u7684\u4fee\u6539&#xff0c;\u5f15\u53d1\u9690\u85cfbug<br \/>\n    }<br \/>\n}<\/p>\n<\/li>\n<\/ul>\n<h5>2. \u4f5c\u7528\u57df\u8d8a\u5c0f&#xff0c;\u53ef\u7ef4\u62a4\u6027\u8d8a\u9ad8&#xff08;\u51cf\u5c11 bug &#043; \u964d\u4f4e\u4fee\u6539\u6210\u672c&#xff09;<\/h5>\n<ul>\n<li>\u51cf\u5c11\u53d8\u91cf\u6c61\u67d3&#xff1a;\u5c0f\u4f5c\u7528\u57df\u7684\u53d8\u91cf\u4ec5\u5728\u5c40\u90e8\u751f\u6548&#xff0c;\u4e0d\u4f1a\u88ab\u5176\u4ed6\u65e0\u5173\u4ee3\u7801\u610f\u5916\u4fee\u6539\u3002\u6bd4\u5982\u5faa\u73af\u53d8\u91cfi\u5b9a\u4e49\u5728\u5faa\u73af\u5185&#xff0c;\u5176\u4ed6\u65b9\u6cd5\u6839\u672c\u63a5\u89e6\u4e0d\u5230&#xff0c;\u907f\u514d\u4e86 \u201c\u4e00\u5904\u6539 i&#xff0c;\u5168\u7c7b\u51fa\u95ee\u9898\u201d \u7684\u60c5\u51b5\u3002<\/li>\n<li>\u964d\u4f4e\u8026\u5408\u5ea6&#xff1a;\u5982\u679c\u628a\u6240\u6709\u53d8\u91cf\u90fd\u5b9a\u4e49\u4e3a\u7c7b\u7ea7&#xff08;\u5168\u5c40&#xff09;&#xff0c;\u4fee\u6539\u4e00\u4e2a\u53d8\u91cf\u53ef\u80fd\u5f71\u54cd\u591a\u4e2a\u65b9\u6cd5&#xff1b;\u800c\u5c40\u90e8\u53d8\u91cf\u4ec5\u5f71\u54cd\u5f53\u524d\u4ee3\u7801\u5757&#xff0c;\u4fee\u6539\u65f6\u53ea\u9700\u5173\u6ce8\u5c0f\u8303\u56f4\u903b\u8f91&#xff0c;\u98ce\u9669\u53ef\u63a7\u3002<\/li>\n<li>\u4fbf\u4e8e\u91cd\u6784&#xff1a;\u5c0f\u4f5c\u7528\u57df\u7684\u4ee3\u7801\u5757&#xff08;\u6bd4\u5982\u65b9\u6cd5\u5185\u7684\u5c40\u90e8\u903b\u8f91&#xff09;\u53ef\u4ee5\u8f7b\u677e\u62bd\u53d6\u6210\u72ec\u7acb\u65b9\u6cd5&#xff0c;\u800c\u5168\u5c40\u53d8\u91cf\u4f1a\u8ba9\u91cd\u6784\u53d8\u5f97\u754f\u624b\u754f\u811a&#xff08;\u62c5\u5fc3\u5176\u4ed6\u5730\u65b9\u4f9d\u8d56\u5b83&#xff09;\u3002<\/li>\n<\/ul>\n<h5>3. \u4e0d\u5408\u7406\u7684\u4f5c\u7528\u57df&#xff08;\u8fc7\u5927 \/ \u8fc7\u5c0f&#xff09;\u4f1a\u76f4\u63a5\u62c9\u4f4e\u4ee3\u7801\u8d28\u91cf<\/h5>\n<table>\n<tr>\u95ee\u9898\u7c7b\u578b\u5177\u4f53\u8868\u73b0\u8d1f\u9762\u5f71\u54cd<\/tr>\n<tbody>\n<tr>\n<td>\u4f5c\u7528\u57df\u8fc7\u5927<\/td>\n<td>\u5c40\u90e8\u53d8\u91cf\u5b9a\u4e49\u4e3a\u7c7b\u6210\u5458\u3001\u79c1\u6709\u65b9\u6cd5\u8bbe\u4e3a\u516c\u6709\u3001\u5e38\u91cf\u5b9a\u4e49\u5728\u5168\u5c40<\/td>\n<td>\u53d8\u91cf\u6613\u88ab\u8bef\u6539\u3001\u4ee3\u7801\u903b\u8f91\u6df7\u4e71\u3001\u5b89\u5168\u98ce\u9669\u5347\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>\u4f5c\u7528\u57df\u8fc7\u5c0f<\/td>\n<td>\u91cd\u590d\u5728\u591a\u4e2a\u65b9\u6cd5\u5185\u5b9a\u4e49\u76f8\u540c\u529f\u80fd\u7684\u53d8\u91cf \/ \u65b9\u6cd5&#xff08;\u6bd4\u5982\u6bcf\u4e2a\u65b9\u6cd5\u90fd\u5b9a\u4e49int max&#061;0&#xff09;<\/td>\n<td>\u4ee3\u7801\u5197\u4f59\u3001\u4fee\u6539\u65f6\u9700\u6539\u591a\u5904\u3001\u8fdd\u80cc DRY \u539f\u5219<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>4. \u9075\u5faa\u4f5c\u7528\u57df\u89c4\u5219\u7684 \u201c\u6700\u4f73\u5b9e\u8df5\u201d&#xff08;\u63d0\u5347\u53ef\u8bfb\u6027 \/ \u53ef\u7ef4\u62a4\u6027&#xff09;<\/h5>\n<li>\u6700\u5c0f\u4f5c\u7528\u57df\u539f\u5219&#xff1a;\u53d8\u91cf \/ \u65b9\u6cd5\u80fd\u5b9a\u4e49\u5728\u5c40\u90e8\u5c31\u4e0d\u5b9a\u4e49\u5728\u7c7b\u7ea7&#xff0c;\u80fd\u8bbe\u4e3a\u79c1\u6709\u5c31\u4e0d\u8bbe\u4e3a\u516c\u6709\u3002\u6bd4\u5982&#xff1a;\n<ul>\n<li>\u5faa\u73af\u53d8\u91cfi\u76f4\u63a5\u5b9a\u4e49\u5728for\u5faa\u73af\u91cc&#xff08;for(int i&#061;0;&#8230;)&#xff09;&#xff0c;\u800c\u975e\u65b9\u6cd5\u5f00\u5934\u3002<\/li>\n<li>\u4ec5\u5728\u4e00\u4e2a\u65b9\u6cd5\u5185\u4f7f\u7528\u7684\u5e38\u91cf&#xff0c;\u5b9a\u4e49\u4e3a\u65b9\u6cd5\u5185\u7684final\u53d8\u91cf&#xff0c;\u800c\u975e\u7c7b\u7ea7\u5e38\u91cf\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u907f\u514d\u4f5c\u7528\u57df\u5c4f\u853d&#xff1a;\u4e0d\u8981\u8ba9\u5c40\u90e8\u53d8\u91cf\u548c\u6210\u5458\u53d8\u91cf\u540c\u540d&#xff08;\u6bd4\u5982\u7c7b\u91cc\u6709String name&#xff0c;\u65b9\u6cd5\u5185\u53c8\u5b9a\u4e49String name&#xff09;&#xff0c;\u4f1a\u8ba9\u8bfb\u8005\u6df7\u6dc6\u53d8\u91cf\u6765\u6e90&#xff0c;\u589e\u52a0\u7406\u89e3\u6210\u672c\u3002<\/li>\n<li>\u5408\u7406\u4f7f\u7528\u8bbf\u95ee\u4fee\u9970\u7b26&#xff1a;\n<ul>\n<li>private&#xff1a;\u4ec5\u672c\u7c7b\u8bbf\u95ee&#xff08;\u6700\u5c0f\u4f5c\u7528\u57df&#xff0c;\u4f18\u5148\u4f7f\u7528&#xff09;&#xff1b;<\/li>\n<li>protected&#xff1a;\u672c\u7c7b &#043; 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