{"id":35238,"date":"2024-11-26T13:31:02","date_gmt":"2024-11-26T05:31:02","guid":{"rendered":"https:\/\/fwq.ai\/blog\/35238\/"},"modified":"2024-11-26T13:31:02","modified_gmt":"2024-11-26T05:31:02","slug":"%e7%bb%a7%e6%89%bf%e6%8e%a5%e5%8f%a3%e4%bd%86%e4%b8%8d%e6%89%a9%e5%b1%95%e6%96%b9%e6%b3%95%e7%9a%84%e6%84%8f%e4%b9%89%e4%bd%95%e5%9c%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/35238\/","title":{"rendered":"\u7ee7\u627f\u63a5\u53e3\u4f46\u4e0d\u6269\u5c55\u65b9\u6cd5\u7684\u610f\u4e49\u4f55\u5728\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173064283090418.jpg\" class=\"aligncenter\" title=\"\u7ee7\u627f\u63a5\u53e3\u4f46\u4e0d\u6269\u5c55\u65b9\u6cd5\u7684\u610f\u4e49\u4f55\u5728\uff1f\u63d2\u56fe\" alt=\"\u7ee7\u627f\u63a5\u53e3\u4f46\u4e0d\u6269\u5c55\u65b9\u6cd5\u7684\u610f\u4e49\u4f55\u5728\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>\u63a5\u53e3\u7ee7\u627f\u4e0d\u6269\u5c55\u65b9\u6cd5\u7684\u610f\u4e49<\/strong><\/p>\n<p>\u5728\u4e00\u4e2a\u573a\u666f\u4e2d\uff0c\u6211\u4eec\u9047\u5230\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre>interface a {\n    void xx();\n    string yy();\n}\n\ninterface b extends a {\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5bf9\u4e8e java \u521d\u5b66\u8005\u6765\u8bf4\uff0c\u4e00\u4e2a\u7591\u95ee\u6cb9\u7136\u800c\u751f\uff1a\u65e2\u7136\u63a5\u53e3 b \u7ee7\u627f\u4e86\u6240\u6709 a \u7684\u65b9\u6cd5\uff0c\u5728\u540e\u7eed\u6269\u5c55\u4e2d\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 a\uff0c\u90a3\u4e48\u521b\u5efa b \u6709\u4ec0\u4e48\u610f\u4e49\uff1f<\/p>\n<p>\u5176\u5b9e\uff0cb \u7ee7\u627f a \u4e0d\u4ec5\u4ec5\u53ea\u662f\u65b9\u6cd5\u7684\u7ee7\u627f\uff0c\u8fd8\u610f\u5473\u7740\uff1a<\/p>\n<p><strong>\u7c7b\u578b\u6807\u8bb0<\/strong><\/p>\n<p>b \u7684\u5b58\u5728\u7ed9\u51fa\u4e86\u4e00\u4e2a\u7c7b\u578b\u6807\u8bb0\u3002\u5bf9\u4e8e\u4ece b \u6d3e\u751f\u7684\u7c7b\u578b\uff0c\u53ef\u4ee5\u5728\u7c7b\u578b\u8fc7\u6ee4\u65f6\u6d3e\u4e0a\u7528\u573a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4ee3\u7801\uff1a<\/p>\n<pre>List&lt;A&gt; listA = new ArrayList&lt;&gt;();\nList&lt;B&gt; listB = new ArrayList&lt;&gt;();\n\nif (listA instanceof List&lt;B&gt;) {\n    \/\/ \u7c7b\u578b\u8f6c\u6362\u5b89\u5168\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5982\u679c\u6ca1\u6709 b \u63a5\u53e3\uff0c\u7c7b\u578b\u8fc7\u6ee4\u5c06\u53d8\u5f97\u56f0\u96be\uff0c\u56e0\u4e3a a \u4e2d\u7684\u65b9\u6cd5\u4f1a\u5728 list<\/p>\n<p>\u901a\u8fc7\u5f15\u5165 b \u63a5\u53e3\uff0c\u6211\u4eec\u53ef\u4ee5\u7528\u5b83\u6765\u6807\u8bb0\u5177\u4f53\u6d3e\u751f\u7c7b\u578b\uff0c\u4ee5\u4fbf\u5728\u8fd0\u884c\u65f6\u66f4\u7cbe\u786e\u5730\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\u548c\u8f6c\u6362\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u7ee7\u627f\u63a5\u53e3\u4f46\u4e0d\u6269\u5c55\u65b9\u6cd5\u7684\u610f\u4e49\u4f55\u5728\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a5\u53e3\u7ee7\u627f\u4e0d\u6269\u5c55\u65b9\u6cd5\u7684\u610f\u4e49 \u5728\u4e00\u4e2a\u573a\u666f\u4e2d\uff0c\u6211\u4eec\u9047\u5230\u5982\u4e0b\u4ee3\u7801\uff1a interface a { void xx(); string yy(); } interface b extends a { } \u767b\u5f55\u540e\u590d\u5236 \u5bf9\u4e8e java \u521d\u5b66\u8005\u6765\u8bf4\uff0c\u4e00\u4e2a\u7591\u95ee\u6cb9\u7136\u800c\u751f\uff1a\u65e2\u7136\u63a5\u53e3 b \u7ee7\u627f\u4e86\u6240\u6709 a \u7684\u65b9\u6cd5\uff0c\u5728\u540e\u7eed\u6269\u5c55\u4e2d\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528 a\uff0c\u90a3\u4e48\u521b\u5efa b \u6709\u4ec0\u4e48\u610f\u4e49\uff1f \u5176\u5b9e\uff0cb \u7ee7\u627f a \u4e0d\u4ec5\u4ec5\u53ea\u662f\u65b9\u6cd5\u7684\u7ee7\u627f\uff0c\u8fd8\u610f\u5473\u7740\uff1a \u7c7b\u578b\u6807\u8bb0 b \u7684\u5b58\u5728\u7ed9\u51fa\u4e86\u4e00\u4e2a\u7c7b\u578b\u6807\u8bb0\u3002\u5bf9\u4e8e\u4ece b \u6d3e\u751f\u7684\u7c7b\u578b\uff0c\u53ef\u4ee5\u5728\u7c7b\u578b\u8fc7\u6ee4\u65f6\u6d3e\u4e0a\u7528\u573a\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4ee3\u7801\uff1a List&lt;A&gt; listA = new ArrayList&lt;&gt;(); List&lt;B&gt; listB = new ArrayList&lt;&gt;(); if (listA instanceof List&lt;B&gt;) { \/\/ \u7c7b\u578b\u8f6c\u6362\u5b89\u5168 } \u767b\u5f55\u540e\u590d\u5236 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-35238","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/35238","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=35238"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/35238\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=35238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=35238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=35238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}