{"id":202851,"date":"2025-05-22T09:32:27","date_gmt":"2025-05-22T01:32:27","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202851\/"},"modified":"2025-05-22T09:32:27","modified_gmt":"2025-05-22T01:32:27","slug":"java%e4%b8%ad%e5%87%bd%e6%95%b0%e5%8f%82%e6%95%b0%e7%9a%84%e9%bb%98%e8%ae%a4%e5%80%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202851\/","title":{"rendered":"Java\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u9ed8\u8ba4\u503c"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>Java\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u9ed8\u8ba4\u503c<\/h1>\n<p>\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u6587\u7ae0<\/span>\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300aJava\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u9ed8\u8ba4\u503c\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n<p>Java \u51fd\u6570\u53c2\u6570\u53ef\u901a\u8fc7\u7b49\u53f7\u6307\u5b9a\u9ed8\u8ba4\u503c\uff0c\u4ece\u800c\u7b80\u5316\u8c03\u7528\u5e76\u63d0\u5347\u53ef\u8bfb\u6027\u3002\u8bed\u6cd5\uff1a\u53c2\u6570\u7c7b\u578b\u540e\u63a5\u7b49\u53f7\u548c\u9ed8\u8ba4\u503c\u3002\u7528\u6cd5\uff1a\u7565\u53bb\u53c2\u6570\u4f7f\u7528\u9ed8\u8ba4\u503c\uff0c\u63d0\u4f9b\u53c2\u6570\u4f7f\u7528\u81ea\u5b9a\u4e49\u503c\u3002\u5b9e\u6218\uff1a\u53ef\u4f7f\u7528\u9ed8\u8ba4\u503c\u8ba1\u7b97\u5706\u9762\u79ef\uff0c\u6216\u63d0\u4f9b\u81ea\u5b9a\u4e49 pi \u503c\u8fdb\u884c\u8ba1\u7b97\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241026\/1729950941671cf4dd53250.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>Java \u4e2d\u51fd\u6570\u53c2\u6570\u7684\u9ed8\u8ba4\u503c<\/strong><\/p>\n<p><strong>\u7b80\u4ecb<\/strong><\/p>\n<p>Java \u5141\u8bb8\u4f60\u4e3a\u51fd\u6570\u53c2\u6570\u6307\u5b9a\u9ed8\u8ba4\u503c\uff0c\u8fd9\u53ef\u4ee5\u7b80\u5316\u51fd\u6570\u8c03\u7528\u5e76\u589e\u5f3a\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002\u672c\u6587\u5c06\u4ecb\u7ecd\u5728 Java \u4e2d\u4f7f\u7528\u51fd\u6570\u53c2\u6570\u9ed8\u8ba4\u503c\u7684\u65b9\u6cd5\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b\u3002<\/p>\n<p><strong>\u8bed\u6cd5<\/strong><\/p>\n<p>\u8981\u4e3a\u51fd\u6570\u53c2\u6570\u6307\u5b9a\u9ed8\u8ba4\u503c\uff0c\u53ea\u9700\u5728\u53c2\u6570\u7c7b\u578b\u540e\u9762\u8ddf\u4e0a\u7b49\u53f7 (=) \u548c\u9ed8\u8ba4\u503c\u5373\u53ef\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>void greet(String name, String message = \"\u4f60\u597d\") {\n    System.out.println(message + \", \" + name);\n}<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c<code>message<\/code> \u53c2\u6570\u7684\u9ed8\u8ba4\u503c\u4e3a &#8220;\u4f60\u597d&#8221;\u3002\u8fd9\u610f\u5473\u7740\u5982\u679c\u4f60\u4e0d\u63d0\u4f9b <code>message<\/code> \u53c2\u6570\uff0c\u8be5\u9ed8\u8ba4\u503c\u5c06\u88ab\u81ea\u52a8\u4f7f\u7528\u3002<\/p>\n<p><strong>\u4f7f\u7528\u65b9\u6cd5<\/strong><\/p>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528\u6216\u4e0d\u4f7f\u7528\u9ed8\u8ba4\u503c\u8c03\u7528\u51fd\u6570\u3002\u5982\u679c\u4f60\u8981\u4f7f\u7528\u9ed8\u8ba4\u503c\uff0c\u53ea\u9700\u7701\u7565\u8be5\u53c2\u6570\u5373\u53ef\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>greet(\"\u7ea6\u7ff0\"); \/\/ \u8f93\u51fa\uff1a\u4f60\u597d\uff0c\u7ea6\u7ff0<\/pre>\n<p>\u5982\u679c\u4f60\u8981\u4f7f\u7528\u81ea\u5b9a\u4e49\u503c\uff0c\u5219\u9700\u8981\u63d0\u4f9b\u8be5\u53c2\u6570\u3002\u4f8b\u5982\uff1a<\/p>\n<pre>greet(\"\u7ea6\u7ff0\", \"\u6b22\u8fce\u6765\u5230 Java \u4e16\u754c\"); \/\/ \u8f93\u51fa\uff1a\u6b22\u8fce\u6765\u5230 Java \u4e16\u754c\uff0c\u7ea6\u7ff0<\/pre>\n<p><strong>\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u4f7f\u7528\u51fd\u6570\u53c2\u6570\u9ed8\u8ba4\u503c\u7684\u5b9e\u6218\u6848\u4f8b\uff1a<\/p>\n<pre>\/\/ \u521b\u5efa\u4e00\u4e2a\u8ba1\u7b97\u5706\u9762\u79ef\u7684\u51fd\u6570\ndouble calculateArea(double radius, double pi) {\n    return pi * radius * radius;\n}\n\n\/\/ \u4e3b\u51fd\u6570\npublic static void main(String[] args) {\n    \/\/ \u4f7f\u7528\u9ed8\u8ba4\u503c\u8fdb\u884c\u8c03\u7528\n    double area1 = calculateArea(5);\n\n    \/\/ \u4f7f\u7528\u81ea\u5b9a\u4e49\u503c\u8fdb\u884c\u8c03\u7528\n    double area2 = calculateArea(5, Math.PI);\n\n    System.out.println(\"\u9762\u79ef 1\uff1a\" + area1);\n    System.out.println(\"\u9762\u79ef 2\uff1a\" + area2);\n}<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u793a\u4f8b\u4e2d\uff0c<code>calculateArea<\/code> \u51fd\u6570\u6709\u4e24\u4e2a\u53c2\u6570\uff1a<code>radius<\/code> \u548c <code>pi<\/code>\u3002<code>pi<\/code> \u53c2\u6570\u6709\u9ed8\u8ba4\u503c <code>Math.PI<\/code>\u3002\u8fd9\u610f\u5473\u7740\u5982\u679c\u4f60\u4e0d\u63d0\u4f9b <code>pi<\/code> \u53c2\u6570\uff0c\u51fd\u6570\u5c06\u81ea\u52a8\u4f7f\u7528 <code>Math.PI<\/code>\u3002<\/p>\n<p><strong>\u6ce8\u610f<\/strong><\/p>\n<ul>\n<li>\u53ea\u80fd\u4e3a\u53ef\u9009\u53c2\u6570\u6307\u5b9a\u9ed8\u8ba4\u503c\u3002<\/li>\n<li>\u9ed8\u8ba4\u503c\u5fc5\u987b\u662f\u7f16\u8bd1\u65f6\u5e38\u91cf\u8868\u8fbe\u5f0f\u3002<\/li>\n<li>\u4e00\u4e2a\u51fd\u6570\u53ea\u80fd\u6709\u4e00\u4e2a\u5177\u6709\u9ed8\u8ba4\u503c\u7684\u53c2\u6570\u3002<\/li>\n<\/ul>\n<p>\u7406\u8bba\u8981\u638c\u63e1\uff0c\u5b9e\u64cd\u4e0d\u80fd\u843d\uff01\u4ee5\u4e0a\u5173\u4e8e\u300aJava\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u9ed8\u8ba4\u503c\u300b\u7684\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u5927\u5bb6\u90fd\u638c\u63e1\u4e86\u5427\uff01\u5982\u679c\u60f3\u8981\u7ee7\u7eed\u63d0\u5347\u81ea\u5df1\u7684\u80fd\u529b\uff0c\u90a3\u4e48\u5c31\u6765\u5173\u6ce8\u516c\u4f17\u53f7\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u4e2d\u51fd\u6570\u53c2\u6570\u7684\u9ed8\u8ba4\u503c \u5c0f\u4f19&#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-202851","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202851","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=202851"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202851\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202851"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202851"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202851"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}