{"id":203852,"date":"2025-05-22T13:32:06","date_gmt":"2025-05-22T05:32:06","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203852\/"},"modified":"2025-05-22T13:32:06","modified_gmt":"2025-05-22T05:32:06","slug":"java-%e4%b8%ad%e7%9a%84%e5%8a%a8%e6%80%81%e7%bb%91%e5%ae%9a%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88%e5%ad%90%e7%b1%bb%e6%96%b9%e6%b3%95%e6%9c%89%e6%97%b6%e6%97%a0%e6%b3%95%e8%a2%ab%e8%b0%83%e7%94%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203852\/","title":{"rendered":"Java \u4e2d\u7684\u52a8\u6001\u7ed1\u5b9a\uff1a\u4e3a\u4ec0\u4e48\u5b50\u7c7b\u65b9\u6cd5\u6709\u65f6\u65e0\u6cd5\u88ab\u8c03\u7528\uff1f"},"content":{"rendered":"

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

Java \u4e2d\u7684\u52a8\u6001\u7ed1\u5b9a\uff1a\u4e3a\u4ec0\u4e48\u5b50\u7c7b\u65b9\u6cd5\u6709\u65f6\u65e0\u6cd5\u88ab\u8c03\u7528\uff1f<\/h1>\n

\u7f16\u7a0b\u5e76\u4e0d\u662f\u4e00\u4e2a\u673a\u68b0\u6027\u7684\u5de5\u4f5c\uff0c\u800c\u662f\u9700\u8981\u6709\u601d\u8003\uff0c\u6709\u521b\u65b0\u7684\u5de5\u4f5c\uff0c\u8bed\u6cd5\u662f\u56fa\u5b9a\u7684\uff0c\u4f46\u89e3\u51b3\u95ee\u9898\u7684\u601d\u8def\u5219\u662f\u4f9d\u9760\u4eba\u7684\u601d\u7ef4\uff0c\u8fd9\u5c31\u9700\u8981\u6211\u4eec\u575a\u6301\u5b66\u4e60\u548c\u66f4\u65b0\u81ea\u5df1\u7684\u77e5\u8bc6\u3002\u4eca\u5929\u5c31\u6574\u7406\u5206\u4eab\u300aJava \u4e2d\u7684\u52a8\u6001\u7ed1\u5b9a\uff1a\u4e3a\u4ec0\u4e48\u5b50\u7c7b\u65b9\u6cd5\u6709\u65f6\u65e0\u6cd5\u88ab\u8c03\u7528\uff1f\u300b\uff0c\u6587\u7ae0\u8bb2\u89e3\u7684\u77e5\u8bc6\u70b9\u4e3b\u8981\u5305\u62ec\uff0c\u5982\u679c\u4f60\u5bf9\u6587\u7ae0\u65b9\u9762\u7684\u77e5\u8bc6\u70b9\u611f\u5174\u8da3\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\uff0c\u5728\u8fd9\u53ef\u4ee5\u5bf9\u5927\u5bb6\u7684\u77e5\u8bc6\u79ef\u7d2f\u6709\u6240\u5e2e\u52a9\uff0c\u52a9\u529b\u5f00\u53d1\u80fd\u529b\u7684\u63d0\u5347\u3002<\/p>\n

<\/p>\n

java \u4e2d\u7684\u52a8\u6001\u7ed1\u5b9a<\/strong><\/p>\n

java \u4e2d\u7684\u52a8\u6001\u7ed1\u5b9a\u662f\u4e00\u79cd\u5728\u8fd0\u884c\u65f6\u6839\u636e\u5176\u5b9e\u9645\u7c7b\u578b\u9009\u62e9\u6b63\u786e\u65b9\u6cd5\u7684\u6280\u672f\u3002\u8fd9\u610f\u5473\u7740\u5bf9\u8c61\u53ef\u4ee5\u6267\u884c\u6765\u81ea\u5176\u7236\u7c7b\u548c\u5b9e\u73b0\u7684\u63a5\u53e3\u7684\u65b9\u6cd5\uff0c\u800c\u4e0d\u7ba1\u5176\u58f0\u660e\u7c7b\u578b\u3002<\/p>\n

\u793a\u4f8b 1<\/strong><\/p>\n

\u6b64\u5904\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86 a \u7c7b\u548c\u5b83\u7684\u5b50\u7c7b b\u3002\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a b \u7c7b\u7684\u5bf9\u8c61\u5e76\u5c06\u5176\u5b58\u50a8\u5728 a \u7c7b\u578b\u7684\u53d8\u91cf a \u4e2d\u3002\u5f53\u8c03\u7528 f(int) \u65b9\u6cd5\u65f6\uff0cjava \u865a\u62df\u673a\uff08jvm\uff09\u4f1a\u8bc6\u522b a \u5b9e\u9645\u5f15\u7528\u7684 b \u7c7b\u5bf9\u8c61\uff0c\u5e76\u8c03\u7528\u5339\u914d\u5176\u5b9e\u9645\u7c7b\u578b\u7684 f(int) \u65b9\u6cd5\uff08\u201c\u6211\u662f\u5b50\u7c7b\u201d\uff09\u3002<\/p>\n

class A {\n    public void f(int a) {\n        System.out.println(\"\u6211\u662f\u7236\u7c7b\");\n    }\n}\n\nclass B extends A {\n    @Override\n    public void f(int a) {\n        System.out.println(\"\u6211\u662f\u5b50\u7c7b\");\n    }\n\n    public static void main(String[] args) {\n        A a = new B();\n        a.f(0);\n    }\n}<\/pre>\n
\u793a\u4f8b 2<\/strong><\/p>\n
\u7136\u800c\uff0c\u5728\u7b2c\u4e8c\u4e2a\u793a\u4f8b\u4e2d\uff0cb \u7c7b\u6dfb\u52a0\u4e86\u4e00\u4e2a print(string) \u65b9\u6cd5\uff0ca \u7c7b\u6ca1\u6709\u8fd9\u4e2a\u65b9\u6cd5\u3002\u5f53\u6211\u4eec\u5c1d\u8bd5\u8c03\u7528 a.print(“0”) \u65f6\uff0cjvm \u4f1a\u5c1d\u8bd5\u5728 b \u7c7b\u4e2d\u5bfb\u627e print \u65b9\u6cd5\uff0c\u4f46\u6ca1\u6709\u627e\u5230\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0cjvm \u4e0d\u4f1a\u8f6c\u5230\u7236\u7c7b a \u4e2d\u5bfb\u627e\u8be5\u65b9\u6cd5\uff0c\u56e0\u4e3a a \u88ab\u58f0\u660e\u4e3a a \u7c7b\u578b\uff0c\u5b83\u53ea\u80fd\u8bbf\u95ee a \u7c7b\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u3002<\/p>\n
\u6362\u53e5\u8bdd\u8bf4\uff0c\u52a8\u6001\u7ed1\u5b9a\u4ec5\u9002\u7528\u4e8e\u5bf9\u8c61\u80fd\u591f\u8bbf\u95ee\u7684\u65b9\u6cd5\uff0c\u800c\u5f15\u7528\u53d8\u91cf\u7684\u58f0\u660e\u7c7b\u578b\u51b3\u5b9a\u4e86\u5176\u53ef\u8bbf\u95ee\u7684\u65b9\u6cd5\u96c6\u3002\u5373\u4f7f a \u5b9e\u9645\u5f15\u7528\u7684\u5bf9\u8c61\u662f b \u7c7b\u7684\u5b9e\u4f8b\uff0c\u5b83\u4ecd\u7136\u53ea\u80fd\u8c03\u7528 a \u7c7b\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300aJava \u4e2d\u7684\u52a8\u6001\u7ed1\u5b9a\uff1a\u4e3a\u4ec0\u4e48\u5b50\u7c7b\u65b9\u6cd5\u6709\u65f6\u65e0\u6cd5\u88ab\u8c03\u7528\uff1f\u300b\u7684\u5185\u5bb9\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\uff0c\u5982\u679c\u6709\u4ec0\u4e48\u7591\u95ee\u6216\u8005\u5efa\u8bae\uff0c\u53ef\u4ee5\u5728\u516c\u4f17\u53f7\u4e0b\u591a\u591a\u56de\u590d\u4ea4\u6d41\uff1b\u6587\u4e2d\u82e5\u6709\u4e0d\u6b63\u4e4b\u5904\uff0c\u4e5f\u5e0c\u671b\u56de\u590d\u7559\u8a00\u4ee5\u544a\u77e5\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Java \u4e2d\u7684\u52a8\u6001\u7ed1\u5b9a\uff1a\u4e3a\u4ec0\u4e48\u5b50...<\/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-203852","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203852","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=203852"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203852\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203852"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203852"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203852"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}