{"id":34443,"date":"2024-11-26T12:45:38","date_gmt":"2024-11-26T04:45:38","guid":{"rendered":"https:\/\/fwq.ai\/blog\/34443\/"},"modified":"2024-11-26T12:45:38","modified_gmt":"2024-11-26T04:45:38","slug":"%e5%90%91%e4%b8%8a%e8%bd%ac%e5%9e%8b%e5%90%8e%ef%bc%8cthis%e5%85%b3%e9%94%ae%e5%ad%97%e6%8c%87%e5%90%91%e5%93%aa%e4%b8%aa%e5%af%b9%e8%b1%a1%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/34443\/","title":{"rendered":"\u5411\u4e0a\u8f6c\u578b\u540e\uff0cthis\u5173\u952e\u5b57\u6307\u5411\u54ea\u4e2a\u5bf9\u8c61\uff1f"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/001\/246\/273\/173052741720088.jpg\" class=\"aligncenter\" title=\"\u5411\u4e0a\u8f6c\u578b\u540e\uff0cthis\u5173\u952e\u5b57\u6307\u5411\u54ea\u4e2a\u5bf9\u8c61\uff1f\u63d2\u56fe\" alt=\"\u5411\u4e0a\u8f6c\u578b\u540e\uff0cthis\u5173\u952e\u5b57\u6307\u5411\u54ea\u4e2a\u5bf9\u8c61\uff1f\u63d2\u56fe\" \/><\/p>\n<p><strong>this\u5173\u952e\u5b57\u7684\u7528\u6cd5\u63a2\u8ba8<\/strong><\/p>\n<p>\u5728\u8ba8\u8bbathis\u5173\u952e\u5b57\u7684\u7528\u6cd5\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u6765\u4e86\u89e3\u4e00\u4e2a\u4e0e\u4e4b\u76f8\u5173\u7684\u6982\u5ff5\uff1a\u5411\u4e0a\u8f6c\u578b\u3002<\/p>\n<p>\u5411\u4e0a\u8f6c\u578b\u662f\u6307\u7236\u7c7b\u5bf9\u8c61\u53ef\u4ee5\u8d4b\u503c\u7ed9\u5b50\u7c7b\u5bf9\u8c61\u7684\u8fc7\u7a0b\uff0c\u800cthis\u5173\u952e\u5b57\u4e0d\u4f1a\u53d7\u5230\u6b64\u64cd\u4f5c\u7684\u5f71\u54cd\u3002\u4e3a\u4e86\u66f4\u6e05\u695a\u5730\u7406\u89e3\u8fd9\u4e00\u70b9\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<p>java<\/p>\n<pre>public class A {\n    public int i = 10;\n\n    void print() {\n        System.out.println(\"\u6211\u662fA\u4e2d\u7684\u51fd\u6570\");\n    }\n}\n\nclass B extends A {\n    public int i = 20;\n\n    void print() {\n        System.out.println(\"\u6211\u662fB\u4e2d\u7684\u51fd\u6570\uff0c\u6211\u91cd\u5199\u4e86A\u4e2d\u7684\u540c\u540d\u51fd\u6570\");\n    }\n\n    void speak() {\n        System.out.println(\"\u5411\u4e0a\u8f6c\u578b\u65f6\u6211\u4f1a\u4e22\u5931\");\n    }\n}\n\npublic static void main(String[] args) {\n    B b = new B();\n    A a = b; \/\/ \u6b64\u5904\u5411\u4e0a\u8f6c\u578b\n    b.print();\n    System.out.println(b.i);\n    b.speak();\n    a.print();\n    System.out.println(a.i);\n    ((B) a).speak(); \/\/ a\u5728\u521b\u5efa\u65f6\u867d\u7136\u4e22\u5931\u4e86speak\u65b9\u6cd5\u4f46\u662f\u5411\u4e0b\u8f6c\u578b\u53c8\u627e\u56de\u4e86\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cb\u5bf9\u8c61b\u88ab\u5411\u4e0a\u8f6c\u578b\u4e3aa\u5bf9\u8c61a\u3002\u6b64\u65f6\uff0ca\u5bf9\u8c61\u62e5\u6709b\u5bf9\u8c61\u7684\u6240\u6709 public\u6210\u5458\uff0c\u5305\u62ec\u91cd\u5199\u4e86print()\u65b9\u6cd5\u7684\u540c\u540d\u65b9\u6cd5\u3002\u7136\u800c\uff0ca\u5bf9\u8c61\u4e0d\u62e5\u6709b\u5bf9\u8c61\u7279\u6709\u7684\u65b9\u6cd5()\u3002<\/p>\n<p>\u5f53\u6211\u4eec\u8c03\u7528a.print()\u65f6\uff0c\u5b9e\u9645\u4e0a\u8c03\u7528\u7684\u662fa\u7c7b\u7684print()\u65b9\u6cd5\uff0c\u56e0\u4e3aa\u662fa\u7684\u5bf9\u8c61\u3002\u540c\u6837\u5730\uff0c\u5f53\u6211\u4eec\u8c03\u7528a.i\u65f6\uff0c\u5b9e\u9645\u4e0a\u8bbf\u95ee\u7684\u662fa\u7c7b\u7684i\u5c5e\u6027\uff0c\u56e0\u4e3aa\u662fa\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5373\u4f7fa\u5bf9\u8c61\u5728\u521b\u5efa\u65f6\u4e22\u5931\u4e86speak()\u65b9\u6cd5\uff0c\u6211\u4eec\u4ecd\u7136\u53ef\u4ee5\u901a\u8fc7\u5411\u4e0b\u8f6c\u578b\u5c06\u5176\u53d6\u56de\u3002\u793a\u4f8b\u4e2d\u7684((b) a).speak()\u8c03\u7528\u8868\u660e\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5411\u4e0b\u8f6c\u578b\u5c06a\u5bf9\u8c61\u8f6c\u6362\u4e3ab\u5bf9\u8c61\uff0c\u4ece\u800c\u8bbf\u95eeb\u5bf9\u8c61\u7279\u6709\u7684\u6210\u5458\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u5411\u4e0a\u8f6c\u578b\u540e\uff0cthis\u5173\u952e\u5b57\u6307\u5411\u54ea\u4e2a\u5bf9\u8c61\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>this\u5173\u952e\u5b57\u7684\u7528\u6cd5\u63a2\u8ba8 \u5728\u8ba8\u8bbathis\u5173\u952e\u5b57\u7684\u7528\u6cd5\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u6765\u4e86\u89e3\u4e00\u4e2a\u4e0e\u4e4b\u76f8\u5173\u7684\u6982\u5ff5\uff1a\u5411\u4e0a\u8f6c\u578b\u3002 \u5411\u4e0a\u8f6c\u578b\u662f\u6307\u7236\u7c7b\u5bf9\u8c61\u53ef\u4ee5\u8d4b\u503c\u7ed9\u5b50\u7c7b\u5bf9\u8c61\u7684\u8fc7\u7a0b\uff0c\u800cthis\u5173\u952e\u5b57\u4e0d\u4f1a\u53d7\u5230\u6b64\u64cd\u4f5c\u7684\u5f71\u54cd\u3002\u4e3a\u4e86\u66f4\u6e05\u695a\u5730\u7406\u89e3\u8fd9\u4e00\u70b9\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u4f8b\u5b50\uff1a java public class A { public int i = 10; void print() { System.out.println(&#8220;\u6211\u662fA\u4e2d\u7684\u51fd\u6570&#8221;); } } class B extends A { public int i = 20; void print() { System.out.println(&#8220;\u6211\u662fB\u4e2d\u7684\u51fd\u6570\uff0c\u6211\u91cd\u5199\u4e86A\u4e2d\u7684\u540c\u540d\u51fd\u6570&#8221;); } void speak() { System.out.println(&#8220;\u5411\u4e0a\u8f6c\u578b\u65f6\u6211\u4f1a\u4e22\u5931&#8221;); } } public static void main(String[] args) { B b = new B(); A a = b; [&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-34443","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/34443","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=34443"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/34443\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=34443"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=34443"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=34443"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}