{"id":63,"date":"2021-08-24T15:32:10","date_gmt":"2021-08-24T07:32:10","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/javav2\/?p=63"},"modified":"2021-08-24T16:04:14","modified_gmt":"2021-08-24T08:04:14","slug":"java%e9%9d%a2%e5%90%91%e5%af%b9%e8%b1%a1%e4%b9%8b%e5%a4%9a%e6%80%81","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/javav2\/post-63.html","title":{"rendered":"java\u9762\u5411\u5bf9\u8c61\u4e4b\u591a\u6001"},"content":{"rendered":"\n<p>\u9762\u5411\u5bf9\u8c61\u4e2d\u7684\u591a\u6001\uff0c\u7406\u89e3\u4e3a\uff1a<\/p>\n\n\n\n<ul><li>\u4e00\u4e2a\u5bf9\u8c61\u62e5\u6709\u591a\u79cd\u5f62\u6001<\/li><li>\u4e00\u4e2a\u65b9\u6cd5\u5177\u6709\u591a\u79cd\u5f62\u6001\uff08\u65b9\u6cd5\u7684\u91cd\u8f7d\uff0c\u8986\u76d6\uff09<\/li><\/ul>\n\n\n\n<p>\u8fd9\u91cc\uff0c\u4e3b\u8981\u8bb2\u89e3\u5bf9\u8c61\u7684\u591a\u6001\u3002<\/p>\n\n\n\n<p>\u8fd9\u91cc\u505a\u4e00\u4e2a\u7b80\u5355\u7684\u6bd4\u55bb\uff1a\u4e00\u4e2aStudent\u7c7b\u7ee7\u627f\u4e86Human\u7c7b\uff0c\u90a3\u4e48\u8be5Student\u53ef\u4ee5\u662fStudent\uff0c\u4e5f\u53ef\u4ee5\u662fHuman\uff0c\u5c31\u6709\u4e862\u79cd\u5f62\u6001\uff0c\u8fd9\u5c31\u662f\u5bf9\u8c61\u7684\u591a\u6001\u3002<\/p>\n\n\n\n<h4>\u591a\u6001\u7684\u524d\u63d0<\/h4>\n\n\n\n<p>\u591a\u6001\u7684\u524d\u63d0\uff0c\u662f\u7ee7\u627f\u6216\u8005\u5b9e\u73b0\u63a5\u53e3\u3002<\/p>\n\n\n\n<h4>\u591a\u6001\u7684\u5b9e\u73b0<\/h4>\n\n\n\n<p>\u591a\u6001\u7684\u5b9e\u73b0\uff0c\u4f9d\u8d56\u4e8e\u8f6c\u578b\u3002<\/p>\n\n\n\n<p>\u53ef\u4ee5\u5411\u4e0a\u8f6c\u578b\uff0c\u4ee5\u53ca\u5411\u4e0b\u8f6c\u578b\uff0c\u5373\uff1a\u7075\u6d3b\u7684\u8f6c\u6362\u8eab\u4efd\u3002<\/p>\n\n\n\n<h4>\u591a\u6001\u7684\u597d\u5904<\/h4>\n\n\n\n<p>\u591a\u6001\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u6269\u5c55\u6027\uff0c<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u516c\u53f8\u670910\u4e07\u4e2a\u5458\u5de5\uff0c\u8fd9\u91cc\u6709\u4e00\u4e2a\u5458\u5de5\u7c7b\uff0c\u800c\u5458\u5de5\u7684\u5de5\u4f5c\u5404\u4e0d\u76f8\u540c\uff0c\u5458\u5de5\u5728\u5de5\u4f5c\u65f6\uff0c\u6709\u7684\u662f\u9886\u5bfc\u3001\u6709\u7684\u662f\u7a0b\u5e8f\u5458\u3001\u6709\u7684\u662f\u6e05\u6d01\u5de5\uff0c\u800c\u5728\u8c03\u5ea6\u65f6\uff0c\u5b83\u4eec\u90fd\u662f\u5458\u5de5\uff0c\u53c2\u6570\u7684\u7c7b\u578b\u662f\u76f8\u540c\u7684\uff0c\u6240\u4ee5\u8c03\u5ea6\u8d77\u6765\u5f88\u65b9\u4fbf\u3002<\/p>\n\n\n\n<h2>\u5411\u4e0a\u8f6c\u578b<\/h2>\n\n\n\n<p>\u8fd9\u91cc\u628a\u7ee7\u627f\u548c\u63a5\u53e3\u5206\u5f00\u8bb2\u89e3<\/p>\n\n\n\n<h4>\u7ee7\u627f\u4e2d\u7684\u5411\u4e0a\u8f6c\u578b<\/h4>\n\n\n\n<p>\u5728\u7ee7\u627f\u4e2d\uff0c\u5b50\u7c7b\u8f6c\u6362\u4e3a\u7236\u7c7b\uff0c\u4f8b\u5982\u4ee5\u4e0b\u8bed\u6cd5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Human human = new Student();<\/code><\/pre>\n\n\n\n<p>\u5728\u8be5\u8bed\u6cd5\u4e2d\uff0cnew\u7684\u662fStudent\uff0c\u4f46\u8f6c\u6362\u4e3aHuman\uff0c\u8fd9\u8ba9\u5b83\u770b\u8d77\u6765\u5f88\u5947\u602a\uff0c\u65e2\u4e0d\u662f\u5b8c\u6574\u7684Student\uff0c\u4e5f\u4e0d\u662fHuman\u3002<\/p>\n\n\n\n<p>\u5b83\u6700\u5927\u7684\u7279\u70b9\u662f\uff1a<strong>\u8bed\u6cd5\u4e0a\u662f\u7236\u7c7b\uff0c\u5982\u679c\u5b83\u7684\u65b9\u6cd5\u88ab\u5b50\u7c7b\u91cd\u5199\uff0c\u90a3\u4e48\u4f18\u5148\u4f7f\u7528\u91cd\u5199\u540e\u7684\u65b9\u6cd5\u3002<\/strong><\/p>\n\n\n\n<p>\u56e0\u4e3a\u8bed\u6cd5\u662f\u7236\u7c7b\uff0c\u90a3\u4e48\u65e0\u6cd5\u4f7f\u7528\u5b50\u7c7b\u7279\u6709\u65b9\u6cd5\uff0c\u800c\u5c5e\u6027\u65e0\u6cd5\u88ab\u91cd\u5199\uff08\u5373\u4f7f\u540c\u540d\u91cd\u65b0\u8d4b\u503c\uff09\uff0c\u6240\u4ee5\u5c5e\u6027\u4ecd\u662f\u7236\u7c7b\u7684\u5c5e\u6027\u3002<\/p>\n\n\n\n<p><strong>\u5982\u4f55\u4f7f\u7528\u5b50\u7c7b\u7684\u5c5e\u6027\uff1f<\/strong>\u5411\u4e0a\u8f6c\u578b\u540e\uff0c\u5982\u679c\u5b50\u7c7b\u5c5e\u6027\u91cd\u5199\u4e86\uff0c\u9700\u8981\u4f7f\u7528\u5b50\u7c7b\u5c5e\u6027\uff0c\u90a3\u4e48\u7236\u7c7b\u5e94\u8be5\u6709getter\/setter\uff0c\u4ee5\u53ca\u5b50\u7c7b\u91cd\u5199getter\/setter\uff0c\u90a3\u4e48\u6b64\u65f6\u5c31\u53ef\u4ee5\u901a\u8fc7getter\/setter\u4f7f\u7528\u5b50\u7c7b\u7684\u5c5e\u6027\u4e86\u3002<\/p>\n\n\n\n<h4>\u63a5\u53e3\u7684\u5411\u4e0a\u8f6c\u578b<\/h4>\n\n\n\n<p>\u63a5\u53e3\u4e0d\u80fd\u76f4\u63a5\u521b\u5efa\uff0c\u5982\u679c\u4f7f\u7528\u63a5\u53e3\u63a5\u6536\u4e00\u4e2a\u5b9e\u73b0\u7c7b\uff0c\u90a3\u4e48\u63a5\u53e3\u5b9e\u9645\u4f7f\u7528\u7684\u662f\u5b9e\u73b0\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u63a5\u53e3\u540d\u79f0 \u5bf9\u8c61\u540d =  new \u5b9e\u73b0\u7c7b\u540d\u79f0(\u53c2\u6570);<\/code><\/pre>\n\n\n\n<h2>\u5411\u4e0b\u8f6c\u578b<\/h2>\n\n\n\n<p>\u63a5\u53e3\u65e0\u6cd5\u5f3a\u8f6c\u4e3a\u5b9e\u73b0\u7c7b\uff0c\u5373\u65e0\u6cd5\u5411\u4e0b\u8f6c\u578b\u3002<\/p>\n\n\n\n<p>\u7ee7\u627f\u65f6\uff0c\u5982\u679c\u5728 new \u4f7f\u7528\u7684\u662f\u5b50\u7c7b\uff0c\u4f46\u5411\u4e0a\u8f6c\u4e3a\u7236\u7c7b\uff0c\u6b64\u65f6\u624d\u7b26\u5408\u5f3a\u8f6c\u89c4\u5219\uff0c\u5f3a\u8f6c\u4e3a\u5b50\u7c7b\u540e\uff0c\u8bed\u6cd5\u53d8\u4e3a\u5b50\u7c7b\uff0c\u4f7f\u7528\u8d77\u6765\u548c\u771f\u5b9e\u7684\u5b50\u7c7b\u8bed\u6cd5\u4e00\u81f4\u3002<\/p>\n\n\n\n<h4>instanceof\u5173\u952e\u5b57<\/h4>\n\n\n\n<p>\u4f7f\u7528\u8bed\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5bf9\u8c61 instanceof \u7c7b\u540d<\/code><\/pre>\n\n\n\n<p>\u8be5\u5173\u952e\u5b57\uff0c\u80fd\u5224\u65ad\u67d0\u4e2a\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u7ee7\u627f\u4e8e\u67d0\u4e2a\u7c7b\uff08\u5305\u62ec\u5b83\u672c\u7c7b\uff09\u7684\u5b9e\u4f8b<\/p>\n\n\n\n<p>\u5728\u5411\u4e0b\u8f6c\u578b\u65f6\uff0c\u6211\u4eec\u5e94\u8be5\u5224\u65ad\u67d0\u4e2a\u7c7b\u672c\u8eab\u662f\u5426\u5c5e\u4e8e\u5b83\u7684\u5b50\u7c7b\u3002\u4f8b\u5982<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>System.out.println(human instanceof Student);  \/\/ true or false<\/code><\/pre>\n\n\n\n<p>\u5047\u8bbehuman\u5bf9\u8c61\u5728 new \u65f6\uff0c\u662fStudent\uff0c\u867d\u7136\u5411\u4e0a\u8f6c\u578b\u4e3aHuman\uff0c\u4f46\u4e0a\u8ff0\u4ee3\u7801\u5c06\u8f93\u51fatrue\uff0c\u6240\u4ee5\u8fd9\u91cc\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528instanceof\u5224\u65ad\u80fd\u5426\u5411\u4e0b\u8f6c\u578b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9762\u5411\u5bf9\u8c61\u4e2d\u7684\u591a\u6001\uff0c\u7406\u89e3\u4e3a\uff1a \u4e00\u4e2a\u5bf9\u8c61\u62e5\u6709\u591a\u79cd\u5f62\u6001 \u4e00\u4e2a\u65b9\u6cd5\u5177\u6709\u591a\u79cd\u5f62\u6001\uff08\u65b9\u6cd5\u7684\u91cd\u8f7d\uff0c\u8986\u76d6\uff09 \u8fd9\u91cc\uff0c\u4e3b\u8981\u8bb2\u89e3\u5bf9\u8c61&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/javav2\/post-63.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">java\u9762\u5411\u5bf9\u8c61\u4e4b\u591a\u6001<\/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\/63"}],"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=63"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/posts\/63\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/media?parent=63"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/categories?post=63"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javav2\/wp-json\/wp\/v2\/tags?post=63"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}