{"id":203019,"date":"2025-05-22T08:31:30","date_gmt":"2025-05-22T00:31:30","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203019\/"},"modified":"2025-05-22T08:31:30","modified_gmt":"2025-05-22T00:31:30","slug":"%e9%87%8d%e8%bd%bd%e6%96%b9%e6%b3%95%e5%af%b9-java-%e7%a8%8b%e5%ba%8f%e6%80%a7%e8%83%bd%e6%9c%89%e4%bd%95%e5%bd%b1%e5%93%8d%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203019\/","title":{"rendered":"\u91cd\u8f7d\u65b9\u6cd5\u5bf9 Java \u7a0b\u5e8f\u6027\u80fd\u6709\u4f55\u5f71\u54cd\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u91cd\u8f7d\u65b9\u6cd5\u5bf9 Java \u7a0b\u5e8f\u6027\u80fd\u6709\u4f55\u5f71\u54cd\uff1f<\/h1>\n<p>\u5927\u5bb6\u597d\uff0c\u4eca\u5929\u672c\u4eba\u7ed9\u5927\u5bb6\u5e26\u6765\u6587\u7ae0<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u91cd\u8f7d\u65b9\u6cd5\u5bf9 Java \u7a0b\u5e8f\u6027\u80fd\u6709\u4f55\u5f71\u54cd\uff1f\u300b<\/span>\uff0c\u6587\u4e2d\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span><\/span>\uff0c\u5982\u679c\u4f60\u5bf9<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u90a3\u5c31\u8bf7\u5404\u4f4d\u670b\u53cb\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427~\u5e0c\u671b\u80fd\u771f\u6b63\u5e2e\u5230\u4f60\u4eec\uff0c\u8c22\u8c22\uff01<\/p>\n<p>\u91cd\u8f7d\u65b9\u6cd5\u4f1a\u5f71\u54cd Java \u7a0b\u5e8f\u6027\u80fd\u3002\u4e3b\u8981\u5f71\u54cd\u56e0\u7d20\u5305\u62ec\u65b9\u6cd5\u8c03\u7528\u5f00\u9500\uff0c\u56e0 JVM \u9700\u786e\u5b9a\u6b63\u786e\u7684\u65b9\u6cd5\uff0c\u4ee5\u53ca\u65b9\u6cd5\u5b9e\u73b0\u5f00\u9500\uff0c\u56e0\u7f16\u8bd1\u5668\u9700\u4e3a\u6bcf\u4e2a\u91cd\u8f7d\u7248\u672c\u751f\u6210\u4ee3\u7801\u7247\u6bb5\u3002\u5728\u9891\u7e41\u8c03\u7528\u91cd\u8f7d\u65b9\u6cd5\u65f6\uff0c\u6027\u80fd\u5f00\u9500\u53ef\u80fd\u663e\u7740\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241027\/1730021860671e09e4438b1.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u91cd\u8f7d\u65b9\u6cd5\u5bf9 Java \u7a0b\u5e8f\u6027\u80fd\u7684\u5f71\u54cd<\/strong><\/p>\n<p>\u5728 Java \u4e2d\uff0c\u91cd\u8f7d\u5141\u8bb8\u4f7f\u7528\u76f8\u540c\u7684\u65b9\u6cd5\u540d\u79f0\u521b\u5efa\u591a\u4e2a\u65b9\u6cd5\uff0c\u4f46\u5b83\u4eec\u7684\u7b7e\u540d\uff08\u53c2\u6570\u5217\u8868\uff09\u5fc5\u987b\u4e0d\u540c\u3002\u91cd\u8f7d\u65b9\u6cd5\u5728 Java \u7a0b\u5e8f\u4e2d\u6709\u591a\u79cd\u7528\u9014\uff0c\u4f46\u5b83\u4e5f\u4f1a\u5bf9\u7a0b\u5e8f\u6027\u80fd\u4ea7\u751f\u4e00\u5b9a\u7684\u5f71\u54cd\u3002<\/p>\n<p><strong>\u6027\u80fd\u5f71\u54cd<\/strong><\/p>\n<p>\u91cd\u8f7d\u65b9\u6cd5\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u4e3b\u8981\u53d6\u51b3\u4e8e\u4e24\u79cd\u56e0\u7d20\uff1a<\/p>\n<ul>\n<li><strong>\u65b9\u6cd5\u8c03\u7528\u7684\u5f00\u9500\uff1a<\/strong>\u5f53\u6211\u4eec\u8c03\u7528\u4e00\u4e2a\u91cd\u8f7d\u65b9\u6cd5\u65f6\uff0cJava \u865a\u62df\u673a\uff08JVM\uff09\u9700\u8981\u82b1\u8d39\u4e00\u4e9b\u65f6\u95f4\u6765\u786e\u5b9a\u8981\u8c03\u7528\u7684\u6b63\u786e\u65b9\u6cd5\u3002\u8fd9\u5728\u65b9\u6cd5\u8c03\u7528\u9891\u7e41\u7684\u60c5\u51b5\u4e0b\u4f1a\u4ea7\u751f\u53ef\u89c2\u7684\u5f00\u9500\u3002<\/li>\n<li><strong>\u65b9\u6cd5\u5b9f\u88c5\u7684\u5f00\u9500\uff1a<\/strong>\u91cd\u8f7d\u65b9\u6cd5\u8981\u6c42\u7f16\u8bd1\u5668\u4e3a\u6bcf\u4e2a\u91cd\u8f7d\u7248\u672c\u751f\u6210\u4e0d\u540c\u7684\u4ee3\u7801\u7247\u6bb5\u3002\u8fd9\u589e\u52a0\u4e86\u7f16\u8bd1\u548c\u8fd0\u884c\u65f6\u7684\u5f00\u9500\uff0c\u7279\u522b\u662f\u5728\u6709\u591a\u4e2a\u91cd\u8f7d\u7248\u672c\u7684\u60c5\u51b5\u4e0b\u3002<\/li>\n<\/ul>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684 Java \u7a0b\u5e8f\uff0c\u6f14\u793a\u4e86\u91cd\u8f7d\u65b9\u6cd5\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\uff1a<\/p>\n<pre>public class MethodOverloadingPerformance {\n\n    public static void main(String[] args) {\n        long sum1 = 0;\n        long startTime1 = System.nanoTime();\n        for (int i = 0; i &lt; 1000000; i++) {\n            sum1 += sum(i);\n        }\n        long endTime1 = System.nanoTime();\n        System.out.println(\"Without Overloading: \" + (endTime1 - startTime1));\n\n        long sum2 = 0;\n        long startTime2 = System.nanoTime();\n        for (int i = 0; i &lt; 1000000; i++) {\n            sum2 += sum(i, i);\n        }\n        long endTime2 = System.nanoTime();\n        System.out.println(\"With Overloading: \" + (endTime2 - startTime2));\n    }\n\n    public static int sum(int a) {\n        return a + a;\n    }\n\n    public static int sum(int a, int b) {\n        return a + b;\n    }\n}<\/pre>\n<p>\u5728\u8fd9\u4e2a\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e24\u4e2a\u7248\u672c\u7684 <code>sum<\/code> \u65b9\u6cd5\uff1a\u4e00\u4e2a\u4e0d\u5e26\u53c2\u6570\uff0c\u53e6\u4e00\u4e2a\u5e26\u4e24\u4e2a\u53c2\u6570\u3002\u6211\u4eec\u5bf9\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u8fdb\u884c\u4e86\u57fa\u51c6\u6d4b\u8bd5\uff0c\u4ee5\u6bd4\u8f83\u5b83\u4eec\u7684\u6027\u80fd\u3002<\/p>\n<p>\u8f93\u51fa\u7ed3\u679c\u8868\u660e\uff0c\u6ca1\u6709\u91cd\u8f7d\u7684\u65b9\u6cd5\uff08<code>sum(int a)<\/code>\uff09\u660e\u663e\u6bd4\u91cd\u8f7d\u7684\u65b9\u6cd5\uff08<code>sum(int a, int b)<\/code>\uff09\u5feb\u3002\u8fd9\u662f\u56e0\u4e3a\u91cd\u8f7d\u7684\u65b9\u6cd5\u9700\u8981 JVM \u5728\u6bcf\u6b21\u8c03\u7528\u65f6\u786e\u5b9a\u8981\u8c03\u7528\u7684\u6b63\u786e\u7248\u672c\uff0c\u800c\u6ca1\u6709\u91cd\u8f7d\u7684\u65b9\u6cd5\u53ef\u4ee5\u8df3\u8fc7\u8fd9\u4e00\u6b65\u3002<\/p>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u91cd\u8f7d\u65b9\u6cd5\u53ef\u4ee5\u662f\u4e00\u4e2a\u6709\u7528\u7684\u7279\u6027\uff0c\u4f46\u5b83\u4e5f\u4f1a\u5bf9 Java \u7a0b\u5e8f\u7684\u6027\u80fd\u4ea7\u751f\u4e00\u4e9b\u5f71\u54cd\u3002\u5728\u9891\u7e41\u8c03\u7528\u91cd\u8f7d\u65b9\u6cd5\u7684\u60c5\u51b5\u4e0b\uff0c\u6027\u80fd\u5f00\u9500\u53ef\u80fd\u4f1a\u663e\u7740\u3002\u5728\u4f7f\u7528\u91cd\u8f7d\u65b9\u6cd5\u65f6\uff0c\u7a0b\u5e8f\u5458\u5e94\u6743\u8861\u6027\u80fd\u5f71\u54cd\u5e76\u6839\u636e\u9700\u8981\u8fdb\u884c\u9009\u62e9\u3002<\/p>\n<p>\u672c\u7bc7\u5173\u4e8e\u300a\u91cd\u8f7d\u65b9\u6cd5\u5bf9 Java \u7a0b\u5e8f\u6027\u80fd\u6709\u4f55\u5f71\u54cd\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u91cd\u8f7d\u65b9\u6cd5\u5bf9 Java \u7a0b\u5e8f\u6027\u80fd\u6709&#46;&#46;&#46;<\/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-203019","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203019","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=203019"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203019\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203019"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203019"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203019"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}