{"id":202646,"date":"2025-05-22T11:24:20","date_gmt":"2025-05-22T03:24:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202646\/"},"modified":"2025-05-22T11:24:20","modified_gmt":"2025-05-22T03:24:20","slug":"%e5%a6%82%e4%bd%95%e7%a1%ae%e5%ae%9a%e5%af%bc%e8%87%b4-java-%e5%87%bd%e6%95%b0%e6%89%a7%e8%a1%8c%e6%95%88%e7%8e%87%e4%bd%8e%e4%b8%8b%e7%9a%84%e7%89%b9%e5%ae%9a%e7%93%b6%e9%a2%88%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202646\/","title":{"rendered":"\u5982\u4f55\u786e\u5b9a\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684\u7279\u5b9a\u74f6\u9888\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5982\u4f55\u786e\u5b9a\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684\u7279\u5b9a\u74f6\u9888\uff1f<\/h1>\n

\u5b66\u4e60\u77e5\u8bc6\u8981\u5584\u4e8e\u601d\u8003\uff0c\u601d\u8003\uff0c\u518d\u601d\u8003\uff01\u4eca\u5929\u5c0f\u7f16\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u5982\u4f55\u786e\u5b9a\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684\u7279\u5b9a\u74f6\u9888\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u4e3b\u8981\u5305\u542b<\/span>\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6216\u51c6\u5907\u5b66\u4e60\u6587\u7ae0<\/span>\uff0c\u5c31\u90fd\u4e0d\u8981\u9519\u8fc7\u672c\u6587\u5566~\u8ba9\u6211\u4eec\u4e00\u8d77\u6765\u770b\u770b\u5427\uff0c\u80fd\u5e2e\u52a9\u5230\u4f60\u5c31\u66f4\u597d\u4e86\uff01<\/span><\/p>\n

\u4e3a\u4e86\u786e\u5b9a\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684\u7279\u5b9a\u74f6\u9888\uff0c\u53ef\u91c7\u7528\u4ee5\u4e0b\u65b9\u6cd5\uff1a\u4f7f\u7528 JProfiler \u7b49\u6027\u80fd\u5206\u6790\u5de5\u5177\u68c0\u6d4b\u74f6\u9888\uff1b\u4f7f\u7528 Cyclomatic Complexity \u7b49\u4ee3\u7801\u5206\u6790\u6280\u672f\u8861\u91cf\u4ee3\u7801\u590d\u6742\u5ea6\uff1b\u4f7f\u7528\u5b9e\u9a8c\u65b9\u6cd5\u9694\u79bb\u548c\u9a8c\u8bc1\u74f6\u9888\uff0c\u4f8b\u5982\u4f7f\u7528 Set \u4ee3\u66ff List \u4ee5\u4f18\u5316 removeDuplicates \u51fd\u6570\u3002<\/p>\n

<\/p>\n

\u5982\u4f55\u786e\u5b9a\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684\u7279\u5b9a\u74f6\u9888<\/strong><\/p>\n

\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u4f1a\u9047\u5230 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684\u95ee\u9898\u3002\u4e3a\u4e86\u89e3\u51b3\u95ee\u9898\uff0c\u9996\u5148\u9700\u8981\u627e\u51fa\u5bfc\u81f4\u6548\u7387\u4f4e\u4e0b\u7684\u5177\u4f53\u74f6\u9888\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u4e00\u79cd\u5b9e\u7528\u7684\u65b9\u6cd5\u6765\u5e2e\u52a9\u4f60\u786e\u5b9a\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684\u7279\u5b9a\u74f6\u9888\u3002<\/p>\n

1. \u4f7f\u7528\u6027\u80fd\u5206\u6790\u5de5\u5177<\/strong><\/p>\n

\u53ef\u4ee5\u4f7f\u7528\u8bf8\u5982 JProfiler\u3001VisualVM \u548c Java Flight Recorder \u7b49\u6027\u80fd\u5206\u6790\u5de5\u5177\u6765\u68c0\u6d4b\u74f6\u9888\u3002\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u63d0\u4f9b\u6709\u5173 Java \u5e94\u7528\u7a0b\u5e8f\u6267\u884c\u7684\u8be6\u7ec6\u6027\u80fd\u6570\u636e\uff0c\u5305\u62ec CPU \u4f7f\u7528\u60c5\u51b5\u3001\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3001\u7ebf\u7a0b\u72b6\u6001\u548c GC \u6d3b\u52a8\u7b49\u3002<\/p>\n

\u5b9e\u6218\u6848\u4f8b:<\/strong><\/p>\n

\u4f7f\u7528 JProfiler \u5206\u6790\u4e00\u4e2a\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684 Java \u51fd\u6570\uff1a<\/p>\n

import java.util.ArrayList;\nimport java.util.List;\n\npublic class SlowFunction {\n\n    public static void main(String[] args) {\n        List<Integer> list = new ArrayList<>();\n        for (int i = 0; i < 1000000; i++) {\n            list.add(i);\n        }\n    }\n}<\/pre>\n
\u4f7f\u7528 JProfiler \u5206\u6790\u540e\u53d1\u73b0\uff0c\u74f6\u9888\u5728\u4e8e ArrayList.add()<\/code> \u65b9\u6cd5\u3002\u8be5\u65b9\u6cd5\u5728\u6bcf\u6b21\u6dfb\u52a0\u5143\u7d20\u65f6\u90fd\u4f1a\u5bfc\u81f4 ArrayList \u91cd\u65b0\u5206\u914d\u5185\u5b58\u3002<\/p>\n
2. \u4f7f\u7528\u4ee3\u7801\u5206\u6790\u6280\u672f<\/strong><\/p>\n
\u53ef\u4ee5\u4f7f\u7528\u4ee3\u7801\u5206\u6790\u6280\u672f\uff0c\u5982 Cyclomatic Complexity \u548c Halstead Metrics\uff0c\u6765\u8861\u91cf\u4ee3\u7801\u7684\u590d\u6742\u5ea6\u548c\u53ef\u8bfb\u6027\u3002\u4ee3\u7801\u590d\u6742\u5ea6\u8d8a\u9ad8\uff0c\u51fa\u73b0\u74f6\u9888\u7684\u53ef\u80fd\u6027\u5c31\u8d8a\u5927\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b:<\/strong><\/p>\n
\u4f7f\u7528 SonarQube \u5206\u6790\u4e00\u4e2a\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684 Java \u51fd\u6570\uff1a<\/p>\n
public class ComplexFunction {\n\n    public static int calculate(int a, int b) {\n        if (a > 0 && b > 0) {\n            return a + b;\n        } else if (a < 0 && b < 0) {\n            return a - b;\n        } else if (a == 0) {\n            return b;\n        } else {\n            return a;\n        }\n    }\n}<\/pre>\n
SonarQube \u5206\u6790\u540e\u53d1\u73b0\uff0c\u8be5\u51fd\u6570\u7684 Cyclomatic Complexity \u4e3a 11\uff0c\u8868\u660e\u8be5\u51fd\u6570\u8fc7\u4e8e\u590d\u6742\u3002<\/p>\n
3. \u4f7f\u7528\u5b9e\u9a8c\u65b9\u6cd5<\/strong><\/p>\n
\u53ef\u4ee5\u4f7f\u7528\u5b9e\u9a8c\u65b9\u6cd5\u6765\u9694\u79bb\u548c\u9a8c\u8bc1\u74f6\u9888\u3002\u66f4\u6539\u7a0b\u5e8f\u903b\u8f91\u3001\u7b97\u6cd5\u6216\u6570\u636e\u7ed3\u6784\uff0c\u7136\u540e\u89c2\u5bdf\u6027\u80fd\u7684\u53d8\u5316\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b:<\/strong><\/p>\n
\u4f7f\u7528\u5b9e\u9a8c\u65b9\u6cd5\u4f18\u5316\u4e00\u4e2a\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684 Java \u51fd\u6570\uff1a<\/p>\n
public class OptimizeFunction {\n\n    public static int[] removeDuplicates(int[] arr) {\n        List<Integer> list = new ArrayList<>();\n        for (int i = 0; i < arr.length; i++) {\n            if (!list.contains(arr[i])) {\n                list.add(arr[i]);\n            }\n        }\n        int[] result = new int[list.size()];\n        for (int i = 0; i < list.size(); i++) {\n            result[i] = list.get(i);\n        }\n        return result;\n    }\n}<\/pre>\n
\u5b9e\u9a8c\u53d1\u73b0\uff0c\u901a\u8fc7\u4f7f\u7528 Set \u4ee3\u66ff List \u6765\u5b58\u50a8\u5143\u7d20\uff0c\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u6267\u884c\u65f6\u95f4\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u786e\u5b9a\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u7684\u7279\u5b9a\u74f6\u9888\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8eJava\u6027\u80fd,\u74f6\u9888\u8bc6\u522b\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u786e\u5b9a\u5bfc\u81f4 Java \u51fd\u6570\u6267\u884c...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202646","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202646","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202646"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202646\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202646"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202646"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202646"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}