{"id":39091,"date":"2024-11-26T10:47:26","date_gmt":"2024-11-26T02:47:26","guid":{"rendered":"https:\/\/fwq.ai\/blog\/39091\/"},"modified":"2024-11-26T10:47:26","modified_gmt":"2024-11-26T02:47:26","slug":"java%e5%ad%90%e7%b1%bb%e6%80%8e%e4%b9%88%e7%94%a8%e7%88%b6%e7%b1%bb%e7%9a%84%e6%95%b0%e7%bb%84","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/39091\/","title":{"rendered":"java\u5b50\u7c7b\u600e\u4e48\u7528\u7236\u7c7b\u7684\u6570\u7ec4"},"content":{"rendered":"<blockquote><p>\n  \u5b50\u7c7b\u6570\u7ec4\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\uff1a1. \u5982\u679c\u58f0\u660e\u7c7b\u578b\u4e3a\u7236\u7c7b\uff0c\u53ef\u76f4\u63a5\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\uff1b2. \u5982\u679c\u58f0\u660e\u7c7b\u578b\u4e3a\u5b50\u7c7b\uff0c\u9700\u8981\u5411\u4e0a\u8f6c\u578b\u4e3a\u7236\u7c7b\u624d\u80fd\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/16\/2024111603571834558.jpg\" class=\"aligncenter\" title=\"java\u5b50\u7c7b\u600e\u4e48\u7528\u7236\u7c7b\u7684\u6570\u7ec4\u63d2\u56fe\" alt=\"java\u5b50\u7c7b\u600e\u4e48\u7528\u7236\u7c7b\u7684\u6570\u7ec4\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u4f7f\u7528\u7236\u7c7b\u6570\u7ec4\u8bbf\u95ee Java \u5b50\u7c7b<\/strong><\/p>\n<p><strong>\u76f4\u63a5\u8bbf\u95ee<\/strong><\/p>\n<ul>\n<li>\u5982\u679c\u5b50\u7c7b\u6570\u7ec4\u7684\u58f0\u660e\u7c7b\u578b\u4e3a\u7236\u7c7b\u7c7b\u578b\uff0c\u5219\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u7236\u7c7b\u5143\u7d20\u3002<\/li>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>class ParentClass {\n    int x;\n}\n\nclass ChildClass extends ParentClass {\n    int y;\n}\n\nParentClass[] parentArr = new ParentClass[2];\nparentArr[0] = new ChildClass();\nparentArr[1] = new ChildClass();\n\n\/\/ \u76f4\u63a5\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\nSystem.out.println(parentArr[0].x);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u5411\u4e0a\u8f6c\u578b<\/strong><\/p>\n<ul>\n<li>\u5982\u679c\u5b50\u7c7b\u6570\u7ec4\u7684\u58f0\u660e\u7c7b\u578b\u4e3a\u5b50\u7c7b\u7c7b\u578b\uff0c\u5219\u9700\u8981\u5c06\u6570\u7ec4\u5143\u7d20\u5411\u4e0a\u8f6c\u578b\u4e3a\u7236\u7c7b\u7c7b\u578b\u624d\u80fd\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\u3002<\/li>\n<li>\u4f7f\u7528 instanceof \u8fd0\u7b97\u7b26\u68c0\u67e5\u5143\u7d20\u7c7b\u578b\uff0c\u7136\u540e\u4f7f\u7528\u5f3a\u5236\u8f6c\u6362\u64cd\u4f5c\u7b26 (ParentClass)\u3002<\/li>\n<li>\u4f8b\u5982\uff1a<\/li>\n<\/ul>\n<pre>ChildClass[] childArr = new ChildClass[2];\nchildArr[0] = new ChildClass();\nchildArr[1] = new ChildClass();\n\n\/\/ \u5411\u4e0a\u8f6c\u578b\u5e76\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\nfor (ChildClass child : childArr) {\n    if (child instanceof ParentClass) {\n        ParentClass parent = (ParentClass) child;\n        System.out.println(parent.x);\n    }\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u5176\u4ed6\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<ul>\n<li>\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7236\u7c7b\u5143\u7d20\u65f6\uff0c\u53ea\u80fd\u8bbf\u95ee\u7236\u7c7b\u6210\u5458\uff0c\u4e0d\u80fd\u8bbf\u95ee\u5b50\u7c7b\u7279\u6709\u7684\u6210\u5458\u3002<\/li>\n<li>\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528\u81ea\u52a8\u88c5\u7bb1\u548c\u62c6\u7bb1\u8fdb\u884c\u5411\u4e0a\u8f6c\u578b\u548c\u5411\u4e0b\u8f6c\u578b\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u5b50\u7c7b\u600e\u4e48\u7528\u7236\u7c7b\u7684\u6570\u7ec4\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>\u5b50\u7c7b\u6570\u7ec4\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\uff1a1. \u5982\u679c\u58f0\u660e\u7c7b\u578b\u4e3a\u7236\u7c7b\uff0c\u53ef\u76f4\u63a5\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\uff1b2. \u5982\u679c\u58f0\u660e\u7c7b\u578b\u4e3a\u5b50\u7c7b\uff0c\u9700\u8981\u5411\u4e0a\u8f6c\u578b\u4e3a\u7236\u7c7b\u624d\u80fd\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\u3002 \u5982\u4f55\u4f7f\u7528\u7236\u7c7b\u6570\u7ec4\u8bbf\u95ee Java \u5b50\u7c7b \u76f4\u63a5\u8bbf\u95ee \u5982\u679c\u5b50\u7c7b\u6570\u7ec4\u7684\u58f0\u660e\u7c7b\u578b\u4e3a\u7236\u7c7b\u7c7b\u578b\uff0c\u5219\u53ef\u4ee5\u76f4\u63a5\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u7236\u7c7b\u5143\u7d20\u3002 \u4f8b\u5982\uff1a class ParentClass { int x; } class ChildClass extends ParentClass { int y; } ParentClass[] parentArr = new ParentClass[2]; parentArr[0] = new ChildClass(); parentArr[1] = new ChildClass(); \/\/ \u76f4\u63a5\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20 System.out.println(parentArr[0].x); \u767b\u5f55\u540e\u590d\u5236 \u5411\u4e0a\u8f6c\u578b \u5982\u679c\u5b50\u7c7b\u6570\u7ec4\u7684\u58f0\u660e\u7c7b\u578b\u4e3a\u5b50\u7c7b\u7c7b\u578b\uff0c\u5219\u9700\u8981\u5c06\u6570\u7ec4\u5143\u7d20\u5411\u4e0a\u8f6c\u578b\u4e3a\u7236\u7c7b\u7c7b\u578b\u624d\u80fd\u8bbf\u95ee\u7236\u7c7b\u5143\u7d20\u3002 \u4f7f\u7528 instanceof \u8fd0\u7b97\u7b26\u68c0\u67e5\u5143\u7d20\u7c7b\u578b\uff0c\u7136\u540e\u4f7f\u7528\u5f3a\u5236\u8f6c\u6362\u64cd\u4f5c\u7b26 (ParentClass)\u3002 \u4f8b\u5982\uff1a ChildClass[] childArr = new ChildClass[2]; childArr[0] = new [&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-39091","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39091","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=39091"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/39091\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=39091"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=39091"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=39091"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}