{"id":62,"date":"2021-08-24T13:45:19","date_gmt":"2021-08-24T05:45:19","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/javav2\/?p=62"},"modified":"2021-08-24T16:07:12","modified_gmt":"2021-08-24T08:07:12","slug":"java%e9%9d%a2%e5%90%91%e5%af%b9%e8%b1%a1%e4%b9%8b%e7%bb%a7%e6%89%bf","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/javav2\/post-62.html","title":{"rendered":"java\u9762\u5411\u5bf9\u8c61\u4e4b\u7ee7\u627f"},"content":{"rendered":"\n<p>\u7ee7\u627f\uff0c\u53ef\u4ee5\u5bf9\u5171\u6027\u62bd\u53d6\uff0c\u5b9e\u73b0\u4ee3\u7801\u91cd\u7528\uff0c\u5b8c\u6210\u4ee3\u7801\u7b80\u5316<\/p>\n\n\n\n<p>\u7b80\u5355\u6765\u8bf4\uff0c\u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b\uff0c\u90a3\u4e48\u5b50\u7c7b\u7ee7\u627f\u4e86\u7236\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u53ef\u4ee5\u4ece\u591a\u4e2a\u89d2\u5ea6\u7406\u89e3java\u4e2d\u7684\u7ee7\u627f<\/p>\n\n\n\n<h2>\u7c7b\u4e0e\u5bf9\u8c61\u89d2\u5ea6<\/h2>\n\n\n\n<p>\u4e00\u4e2a\u7236\u7c7b\uff0c\u53ef\u4ee5\u6709\u591a\u4e2a\u5b50\u7c7b<\/p>\n\n\n\n<p>\u800c\u4e00\u4e2a\u5b50\u7c7b\u53ef\u4ee5\u6709\u591a\u7ea7\u7236\u7c7b\uff0c\u53ea\u80fd\u6709\u4e00\u4e2a\u76f4\u63a5\u7236\u7c7b\uff0c\u7236\u7c7b\u4e5f\u53eb\u57fa\u7c7b\uff0c\u8d85\u7c7b\uff0c\u5b50\u7c7b\u4e5f\u53eb\u6d3e\u751f\u7c7b<\/p>\n\n\n\n<p>\u6240\u6709\u5bf9\u8c61\u5747\u7ee7\u627f\u81ea Object \u7c7b\uff0c\u5373 java.lang.Object<\/p>\n\n\n\n<h5>1.\u5b50\u7c7b\u58f0\u660e\u4e2d\u4f7f\u7528 extends \u5173\u952e\u5b57<\/h5>\n\n\n\n<p>\u5b50\u7c7b\u58f0\u660e\u8bed\u6cd5\uff1a \u5b50\u7c7b\u540d extends \u7236\u7c7b\u540d<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class A{  \/\/\u7236\u7c7b\n\tpublic A(int a){\n\t\tSystem.out.println(\"A\u7684\u6784\u9020\u65b9\u6cd5\");\n\t}\n\tString name = \"A\";\n\tString age = \"age\";\n\tpublic void say() {\n\t\tSystem.out.println(\"I am A class\");\n\t}\n\tpublic void call() {\n\t\tSystem.out.println(\"A call\");\n\t}\n}\nclass B extends A{ \/\/\u5b50\u7c7b\n\tpublic B() {\n\t\tsuper(10);\n\t\tSystem.out.println(\"B\u7684\u6784\u9020\u65b9\u6cd5\");\n\t}\n\tString name = \"B\";\n\tpublic void haha() {\n\t\tSystem.out.println(\"haha\");\n\t}\n\t@Override\n\tpublic void call() {\n\t\tSystem.out.println(\"B call\");\n\t}\n}\n<\/code><\/pre>\n\n\n\n<h5>2.\u5b50\u7c7b\u53ef\u4ee5\u5f53\u4f5c\u7236\u7c7b\u4f7f\u7528<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>A a = new B();<\/code><\/pre>\n\n\n\n<p>\u4e0d\u4f46\u5728\u5bf9\u8c61\u521b\u5efa\u4e0a\uff0c\u5b83\u4e5f\u4f53\u73b0\u5728\u65b9\u6cd5\u7684\u4f20\u53c2\uff0c\u8fd4\u56de\u503c\u4e0a\uff0c\u53ef\u4ee5\u4f20\u9012\u6216\u8fd4\u56de\u5b50\u7c7b\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u5b9e\u9645\u662f\u591a\u6001\u7684\u4e00\u79cd\u601d\u60f3\uff0c\u4e0d\u8fc7\u591a\u8d58\u8ff0\uff0c\u8bf7\u53c2\u8003\u591a\u6001\u3002<\/p>\n\n\n\n<h2>\u6210\u5458\u53d8\u91cf\u89d2\u5ea6<\/h2>\n\n\n\n<p>\u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b\u7684\u6210\u5458\u53d8\u91cf<\/p>\n\n\n\n<h5>1.\u6210\u5458\u540c\u540d\u53d8\u91cf\u4f7f\u7528\u89c4\u5219\uff1a\u4f18\u5148\u4f7f\u7528\u672c\u7c7b\uff0c\u6ca1\u6709\u5219\u5411\u4e0a\u627e<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>B b = new B();\nSystem.out.println(b.name);  \/\/B\nSystem.out.println(b.age);   \/\/age<\/code><\/pre>\n\n\n\n<h5>2.\u5b50\u7c7b\u4e2d\uff0c\u5c40\u90e8\u53d8\u91cf\uff0c\u6210\u5458\u53d8\u91cf\uff0c\u4e0e\u7236\u7c7b\u6210\u5458\u53d8\u91cf\u7684\u8c03\u7528<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5c40\u90e8\u53d8\u91cf\u540d\uff1a\u53d8\u91cf\u540d;\n\u6210\u5458\u53d8\u91cf\u540d\uff1athis.\u6210\u5458\u53d8\u91cf\u540d;\n\u7236\u7c7b\u6210\u5458\u53d8\u91cf\u540d\uff1asuper.\u6210\u5458\u53d8\u91cf\u540d;<\/code><\/pre>\n\n\n\n<h2>\u6210\u5458\u65b9\u6cd5\u89d2\u5ea6<\/h2>\n\n\n\n<p>\u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b\u7684\u6210\u5458\u65b9\u6cd5<\/p>\n\n\n\n<h5>1.\u6210\u5458\u53d8\u91cf\u540c\u540d\u89c4\u5219\uff1a\u4f18\u5148\u4f7f\u7528\u672c\u7c7b\uff0c\u6ca1\u6709\u5219\u5411\u4e0a\u627e<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>B b = new B();\nb.haha();  \/\/haha\nb.call();  \/\/A call<\/code><\/pre>\n\n\n\n<h5>2.\u5b50\u7c7b\u4e2d\uff0c\u6210\u5458\u65b9\u6cd5\uff0c\u4e0e\u7236\u7c7b\u6210\u5458\u65b9\u6cd5\u7684\u8c03\u7528<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6210\u5458\u65b9\u6cd5\uff1a\u65b9\u6cd5\u540d\n\u7236\u7c7b\u6210\u5458\u65b9\u6cd5\uff1asuper.\u6210\u5458\u65b9\u6cd5\u540d;<\/code><\/pre>\n\n\n\n<h5>3.\u5b50\u7c7b\u540c\u540d\u6210\u5458\u65b9\u6cd5\uff08\u65b9\u6cd5\u8986\u76d6\u91cd\u5199\uff09\uff0c\u4f7f\u7528 Override \u6ce8\u89e3\u68c0\u6d4b<\/h5>\n\n\n\n<p>\u8be5\u6ce8\u89e3\uff0c\u4ec5\u8d77\u5230\u68c0\u6d4b\u4f5c\u7528\uff0c\u4e0d\u5199\u8be5\u6ce8\u89e3\uff0c\u5b50\u7c7b\u4ee3\u7801\u6b63\u5e38\u65f6\u4e5f\u80fd\u8fd0\u884c<\/p>\n\n\n\n<p>\u5728\u91cd\u5199\u65f6\uff0c\u6743\u9650\u4fee\u9970\u7b26\u8981\u4e48\u76f8\u540c\uff0c\u8981\u4e48\u66f4\u5bbd\u677e\uff0c\u58f0\u660e\u629b\u51fa\u7684\u5f02\u5e38\u8981\u4e48\u76f8\u540c\uff0c\u8981\u4e48\u66f4\u5c0f\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@Override\npublic void call() {\n\tSystem.out.println(\"B call\");\n}<\/code><\/pre>\n\n\n\n<h2>\u6784\u9020\u65b9\u6cd5\u89d2\u5ea6<\/h2>\n\n\n\n<p>1.\u5b50\u7c7b\u521b\u5efa\u65f6\uff0c\u5fc5\u987b\u5148\u8c03\u7528\u7236\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u518d\u8c03\u7528\u5b50\u7c7b\u6784\u9020<\/p>\n\n\n\n<p>2.\u5b50\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u4e0d\u5199\u65f6\uff0c\u9ed8\u8ba4\u8d60\u9001 super();<\/p>\n\n\n\n<p>3.\u5982\u679c\u7236\u7c7b\u6ca1\u6709\u65e0\u53c2\u6784\u9020\uff0c\u65e0\u6cd5\u8d60\u9001 super();<\/p>\n\n\n\n<p>4.\u7b2c3\u79cd\u60c5\u51b5\u4e0b\uff0c\u5b50\u7c7b\u6784\u9020\u7684\u7b2c\u4e00\u884c\u8bed\u53e5\uff0c\u5fc5\u987b\u5199 super(\u53c2\u6570);<\/p>\n\n\n\n<p>\uff08\u8be5\u8bed\u53e5\u53ea\u80fd\u5728\u5b50\u7c7b\u6784\u9020\u4e2d\u7684\u7b2c\u4e00\u53e5\u8c03\u7528\uff0c\u5176\u4ed6\u5730\u65b9\u5747\u65e0\u6cd5\u8c03\u7528\uff0c\u4e14\u4e0d\u80fd\u4e0ethis\u540c\u65f6\u4f7f\u7528\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ee7\u627f\uff0c\u53ef\u4ee5\u5bf9\u5171\u6027\u62bd\u53d6\uff0c\u5b9e\u73b0\u4ee3\u7801\u91cd\u7528\uff0c\u5b8c\u6210\u4ee3\u7801\u7b80\u5316 \u7b80\u5355\u6765\u8bf4\uff0c\u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b\uff0c\u90a3\u4e48\u5b50\u7c7b\u7ee7\u627f\u4e86\u7236\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002 \u6211&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/javav2\/post-62.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">java\u9762\u5411\u5bf9\u8c61\u4e4b\u7ee7\u627f<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/62"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/comments?post=62"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/62\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/media?parent=62"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/categories?post=62"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/tags?post=62"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}