{"id":112287,"date":"2026-10-03T00:57:33","date_gmt":"2026-10-02T16:57:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/112287.html"},"modified":"2026-10-03T00:57:33","modified_gmt":"2026-10-02T16:57:33","slug":"java%e7%bb%a7%e6%89%bf%e4%b8%8e%e5%a4%9a%e6%80%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/112287.html","title":{"rendered":"Java\u7ee7\u627f\u4e0e\u591a\u6001"},"content":{"rendered":"<\/p>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>\u7ee7\u627f<\/li>\n<li>\n<ul>\n<li>\u6982\u5ff5<\/li>\n<li>\u8bed\u6cd5<\/li>\n<li>\u7236\u7c7b\u6210\u5458\u53d8\u91cf\u8bbf\u95ee<\/li>\n<li>\u7236\u7c7b\u6210\u5458\u65b9\u6cd5\u7684\u8bbf\u95ee<\/li>\n<li>super \u5173\u952e\u5b57<\/li>\n<li>\u7236\u7c7b\u4e0e\u5b50\u7c7b\u7684\u6784\u9020\u65b9\u6cd5<\/li>\n<li>\u7236\u7c7b\u4e0e\u5b50\u7c7b\u4ee3\u7801\u6267\u884c\u7684\u987a\u5e8f<\/li>\n<li>protected<\/li>\n<li>\u7ee7\u627f\u7684\u65b9\u5f0f<\/li>\n<\/ul>\n<\/li>\n<li>final \u5173\u952e\u5b57<\/li>\n<li>\n<ul>\n<li>\u4fee\u9970\u53d8\u91cf<\/li>\n<li>\u4fee\u9970\u7c7b<\/li>\n<li>\u4fee\u9970\u6210\u5458\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<li>\u591a\u6001<\/li>\n<li>\n<ul>\n<li>Java \u4e2d\u591a\u6001\u7684\u5b9e\u73b0\u6761\u4ef6<\/li>\n<li>\u65b9\u6cd5\u7684\u91cd\u5199<\/li>\n<li>\n<ul>\n<li>\u89c4\u5219<\/li>\n<\/ul>\n<\/li>\n<li>\u91cd\u5199\u548c\u91cd\u8f7d<\/li>\n<li>\u91cd\u5199\u7684\u539f\u5219<\/li>\n<li>\u5411\u4e0a\u8f6c\u578b\u4e0e\u52a8\u6001\u7ed1\u5b9a<\/li>\n<li>\u5411\u4e0b\u8f6c\u578b<\/li>\n<li>\u591a\u6001\u7684\u4f7f\u7528<\/li>\n<li>\u907f\u514d\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u8c03\u7528\u91cd\u5199\u7684\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u524d\u8a00<\/h2>\n<p>\u672c\u4eba\u7684\u6280\u672f\u7b14\u8bb0\u4f1a\u4f18\u5148\u53d1\u5e03\u5728\u4e2a\u4eba\u7ad9\u70b9longyxblg.cn<\/p>\n<h2>\u7ee7\u627f<\/h2>\n<p>\u9762\u5411\u5bf9\u8c61\u601d\u60f3\u4e2d\u63d0\u51fa\u4e86\u7ee7\u627f\u7684\u6982\u5ff5&#xff0c;\u4e13\u95e8\u7528\u6765\u8fdb\u884c\u5171\u6027\u62bd\u53d6&#xff0c;\u5b9e\u73b0\u4ee3\u7801\u590d\u7528\u3002<\/p>\n<h3>\u6982\u5ff5<\/h3>\n<p>\u7ee7\u627f\u662f\u9762\u5411\u5bf9\u8c61\u7a0b\u5e8f\u8bbe\u8ba1\u4f7f\u4ee3\u7801\u53ef\u4ee5\u590d\u7528\u7684\u6700\u91cd\u8981\u7684\u624b\u6bb5&#xff0c;\u5b83\u5141\u8bb8\u7a0b\u5e8f\u5458\u5728\u4fdd\u6301\u539f\u6709\u7c7b\u7279\u6027 \u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u6269\u5c55&#xff0c;\u589e\u52a0\u65b0\u529f\u80fd&#xff0c;\u8fd9\u6837\u4ea7\u751f\u65b0\u7684\u7c7b&#xff0c;\u79f0\u5b50\u7c7b(\u4e5f\u79f0\u6d3e\u751f\u7c7b\u6216\u6269\u5c55\u7c7b)\u3002\u7ee7\u627f\u5448\u73b0\u4e86\u9762\u5411\u5bf9\u8c61\u7a0b\u5e8f\u8bbe\u8ba1\u7684\u5c42\u6b21\u7ed3\u6784&#xff0c; \u4f53\u73b0\u4e86\u7531\u7b80\u5355\u5230\u590d\u6742\u7684\u8ba4\u77e5\u8fc7\u7a0b\u3002<\/p>\n<h3>\u8bed\u6cd5<\/h3>\n<p>\u5728 Java \u4e2d\u5982\u679c\u8981\u8868\u793a\u7c7b\u4e4b\u95f4\u7684\u7ee7\u627f\u5173\u7cfb,\u9700\u8981\u7528\u5230 extends \u5173\u952e\u5b57<\/p>\n<p>\u4fee\u9970\u7b26 <span class=\"token keyword\">class<\/span> \u5b50\u7c7b <span class=\"token keyword\">extends<\/span> \u7236\u7c7b <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/ &#8230;  <\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u6b64\u65f6\u6709\u4e00\u4e2a Animal \u7c7b, \u6709 Dog \u7c7b\u548c Cat \u7c7b\u7ee7\u627f\u4ed6<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u9ed8\u8ba4\u540d\u79f0&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u996d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Cat<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p><span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5b50\u7c7b\u4f1a\u5c06\u7236\u7c7b\u4e2d\u7684\u6210\u5458\u53d8\u91cf\u548c\u6210\u5458\u65b9\u6cd5\u7ee7\u627f<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Test<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/       <\/span><br \/>\n        <span class=\"token class-name\">Cat<\/span> cat <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>cat<span class=\"token punctuation\">.<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>cat<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>dog<span class=\"token punctuation\">.<\/span>age<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>dog<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        cat<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165729-6abfe279b2d9e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u7236\u7c7b\u6210\u5458\u53d8\u91cf\u8bbf\u95ee<\/h3>\n<ul>\n<li>\n<p>\u5b50\u7c7b\u548c\u7236\u7c7b\u4e0d\u5b58\u5728\u540c\u540d\u6210\u5458\u53d8\u91cf<\/p>\n<p>\u53c2\u8003\u4e0a\u6587\u4ee3\u7801\u3002<\/p>\n<\/li>\n<li>\n<p>\u5b50\u7c7b\u548c\u7236\u7c7b\u5b58\u5728\u540c\u540d\u6210\u5458\u53d8\u91cf<\/p>\n<p> <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u65fa\u8d22&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n     <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Animal<\/span> animal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>dog<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span>name<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165729-6abfe279d91a8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5982\u679c\u8bbf\u95ee\u7684\u6210\u5458\u53d8\u91cf\u5b50\u7c7b\u4e2d\u6709&#xff0c;\u4f18\u5148\u8bbf\u95ee\u81ea\u5df1\u7684\u6210\u5458\u53d8\u91cf\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u7236\u7c7b\u6210\u5458\u65b9\u6cd5\u7684\u8bbf\u95ee<\/h3>\n<ul>\n<li>\n<p>\u6210\u5458\u65b9\u6cd5\u4e0d\u540c\u540d(\u6216\u5b50\u7c7b\u4e2d\u6ca1\u6709\u8be5\u6210\u5458\u65b9\u6cd5)<\/p>\n<p>\u53c2\u8003\u4e0a\u6587\u4e2d\u7684\u4ee3\u7801<\/p>\n<\/li>\n<li>\n<p>\u6210\u5458\u65b9\u6cd5\u540c\u540d<\/p>\n<p> <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Anima<\/span><span class=\"token punctuation\">{<\/span><br \/>\n       <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u65fa\u8d22&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u72d7\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n     <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">Animal<\/span> animal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165729-6abfe279e6940.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u540c\u540d\u65f6,\u5b50\u7c7b\u5bf9\u8c61\u4f1a\u4f18\u5148\u4f7f\u7528\u81ea\u5df1\u7684\u6210\u5458\u65b9\u6cd5\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>super \u5173\u952e\u5b57<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b,\u60f3\u8981\u5728\u5b50\u7c7b\u4e2d\u4f7f\u7528\u7236\u7c7b\u7684\u6210\u5458\u65b9\u6cd5\u548c\u6210\u5458\u53d8\u91cf,\u8fd9\u65f6\u5019\u53ef\u4ee5\u7528\u5230 super \u5173\u952e\u5b57\u3002<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u9ed8\u8ba4\u540d\u79f0&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> variety <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u6211\u4e5f\u4e0d\u77e5\u9053\u5199\u4ec0\u4e48&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u996d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u65fa\u8d22&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> variety <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u4e2d\u534e\u7530\u56ed\u72ac&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u72d7\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span>variety<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6d4b\u8bd5\u7528 super \u8bbf\u95ee\u7236\u7c7b\u4e2d\u7684 variety&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>dog<span class=\"token punctuation\">.<\/span>variety<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165730-6abfe27a00d9a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u9ed8\u8ba4\u540d\u79f0&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> variety <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u6211\u4e5f\u4e0d\u77e5\u9053\u5199\u4ec0\u4e48&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u996d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u65fa\u8d22&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> variety <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u4e2d\u534e\u7530\u56ed\u72ac&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u72d7\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">animalEat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span>variety<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6d4b\u8bd5\u7528 super \u8bbf\u95ee\u7236\u7c7b\u4e2d\u7684 variety&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">animalEat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165730-6abfe27a1a394.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>super \u5173\u952e\u5b57\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u7236\u7c7b\u4e2d\u7684\u6210\u5458\u65b9\u6cd5\u3002<\/p>\n<hr \/>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f super \u5173\u952e\u5b57\u4e0d\u80fd\u5728\u9759\u6001\u65b9\u6cd5\u4e2d\u4f7f\u7528\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165730-6abfe27a2854e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u7236\u7c7b\u4e0e\u5b50\u7c7b\u7684\u6784\u9020\u65b9\u6cd5<\/h3>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u9ed8\u8ba4\u540d\u79f0&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> variety <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u6211\u4e5f\u4e0d\u77e5\u9053\u5199\u4ec0\u4e48&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> variety<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&#061;<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>variety <span class=\"token operator\">&#061;<\/span> variety<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u996d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7ed9 Animal \u4e2d\u624b\u5199\u4e00\u4e2a\u6784\u9020\u65b9\u6cd5\u540e,\u7f16\u8bd1\u62a5\u9519\u4e86<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165730-6abfe27a5e779.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u5176\u5b9e\u662f\u56e0\u4e3a\u5b50\u7c7b\u4e5f\u4f1a\u7ee7\u627f\u7236\u7c7b\u7684\u6784\u9020\u65b9\u6cd5,\u524d\u6587\u7684\u4ee3\u7801\u4e2d Animal\u3001Cat\u3001Dog \u4e2d\u90fd\u6ca1\u6709\u5199\u6784\u9020\u65b9\u6cd5,\u8fd9\u65f6\u7f16\u8bd1\u5668\u4f1a\u7ed9\u8fd9\u4e09\u4e2a\u7c7b\u4e2d\u81ea\u52a8\u751f\u6210\u6784\u9020\u65b9\u6cd5\u3002<\/p>\n<p>Animal \u4e2d\u81ea\u52a8\u751f\u6210\u7684\u662f<\/p>\n<p>   <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u800c\u5230 Cat \u548c Dog \u7c7b\u4e2d\u751f\u6210\u7684\u6784\u9020\u65b9\u6cd5\u5219\u662f<\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u7f16\u8bd1\u5668\u7ed9\u5b50\u7c7b\u81ea\u52a8\u751f\u6210\u7684\u6784\u9020\u65b9\u6cd5\u4f1a\u7528 super \u5173\u952e\u5b57\u81ea\u52a8\u8c03\u7528\u7236\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\u3002\u8fd9\u610f\u5473\u7740\u5f00\u53d1\u4eba\u5458\u4e5f\u53ef\u4ee5\u7528 super \u5173\u952e\u5b57\u8fdb\u884c\u8c03\u7528\u3002<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u9ed8\u8ba4\u540d\u79f0&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> age <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">18<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> variety <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u6211\u4e5f\u4e0d\u77e5\u9053\u5199\u4ec0\u4e48&#034;<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> variety<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&#061;<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>variety <span class=\"token operator\">&#061;<\/span> variety<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u996d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u65fa\u8d22&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> variety <span class=\"token operator\">&#061;<\/span> <span class=\"token string\">&#034;\u4e2d\u534e\u7530\u56ed\u72ac&#034;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u72d7\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">animalEat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> variety<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">,<\/span> variety<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token comment\">\/\/        super \u5173\u952e\u5b57\u4e0d\u80fd\u5728\u9759\u6001\u65b9\u6cd5\u4e2d\u4f7f\u7528\u3002<\/span><br \/>\n<span class=\"token comment\">\/\/        System.out.println(super.age);<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span>variety<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6d4b\u8bd5\u7528 super \u8bbf\u95ee\u7236\u7c7b\u4e2d\u7684 variety&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u54c8\u5409\u6c6a&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;\u54c8\u58eb\u5947&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">animalEat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165730-6abfe27a73175.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u901a\u8fc7\u8c03\u8bd5\u7a97\u53e3\u53ef\u4ee5\u770b\u5230,\u5728 Dog \u7c7b\u4e2d\u8c03\u7528\u4f7f\u7528 Super \u65b9\u6cd5\u540e, \u662f\u7ed9\u4ece Animal \u4e2d\u7ee7\u627f\u4e0b\u6765\u7684\u6210\u5458\u53d8\u91cf\u8fdb\u884c\u8d4b\u503c\u3002Dog \u7c7b\u4e2d\u5b58\u5728\u7684\u540c\u540d\u6210\u5458\u53d8\u91cf\u5e76\u6ca1\u6709\u8fdb\u884c\u8d4b\u503c\u3002<\/p>\n<ul>\n<li>\n<p>this \u662f\u5f53\u524d\u5bf9\u8c61\u7684\u5f15\u7528&#xff0c;\u5f53\u524d\u5bf9\u8c61\u5373\u8c03\u7528\u5b9e\u4f8b\u65b9\u6cd5\u7684\u5bf9\u8c61&#xff0c;super \u76f8\u5f53\u4e8e\u662f\u5b50\u7c7b\u5bf9\u8c61\u4e2d\u4ece\u7236\u7c7b\u7ee7\u627f\u4e0b\u6765\u90e8\u5206\u6210\u5458\u7684\u5f15\u7528<\/p>\n<\/li>\n<li>\n<p>\u5728\u975e\u9759\u6001\u6210\u5458\u65b9\u6cd5\u4e2d&#xff0c;this\u7528\u6765\u8bbf\u95ee\u672c\u7c7b\u7684\u65b9\u6cd5\u548c\u5c5e\u6027&#xff0c;super\u7528\u6765\u8bbf\u95ee\u7236\u7c7b\u7ee7\u627f\u4e0b\u6765\u7684\u65b9\u6cd5\u548c\u5c5e\u6027<\/p>\n<\/li>\n<li>\n<p>\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u65e0\u8bba\u662f this \u5f15\u7528\u8fd8\u662f super \u5f15\u7528\u90fd\u8981\u653e\u5728\u6784\u9020\u65b9\u6cd5\u7684\u7b2c\u4e00\u53e5<\/p>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165730-6abfe27a8340a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165730-6abfe27ab4351.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<ul>\n<li>\n<p>\u5728\u6784\u9020\u65b9\u6cd5\u4e2d\u4e0d\u80fd\u540c\u65f6\u51fa\u73b0 this \u5f15\u7528\u548c super \u5f15\u7528<\/p>\n<\/li>\n<li>\n<p>\u6784\u9020\u65b9\u6cd5\u4e2d\u4e00\u5b9a\u4f1a\u5b58\u5728super(\u2026)\u7684\u8c03\u7528&#xff0c;\u7528\u6237\u6ca1\u6709\u5199\u7f16\u8bd1\u5668\u4e5f\u4f1a\u589e\u52a0&#xff0c;\u4f46\u662fthis(\u2026)\u7528\u6237\u4e0d\u5199\u5219\u6ca1\u6709<\/p>\n<\/li>\n<li>\n<p>this \u548c super \u90fd\u53ea\u80fd\u5728\u7c7b\u7684\u975e\u9759\u6001\u65b9\u6cd5\u4e2d\u4f7f\u7528, \u8bbf\u95ee\u975e\u9759\u6001\u65b9\u6cd5\u548c\u5b57\u6bb5<\/p>\n<\/li>\n<\/ul>\n<h3>\u7236\u7c7b\u4e0e\u5b50\u7c7b\u4ee3\u7801\u6267\u884c\u7684\u987a\u5e8f<\/h3>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> a<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7236\u7c7b\u7684\u9759\u6001\u4ee3\u7801\u5757\u6267\u884c\u4e86&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u7236\u7c7b\u7684\u6784\u9020\u4ee3\u7801\u5757\u6267\u884c\u4e86&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">B<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">static<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u7c7b\u7684\u9759\u6001\u4ee3\u7801\u5757\u6267\u884c\u4e86&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>b <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">20<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u7c7b\u7684\u6784\u9020\u4ee3\u7801\u5757\u6267\u884c\u4e86&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165731-6abfe27b03349.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u89c1\u662f\u9759\u6001\u4ee3\u7801\u5757\u5148\u6267\u884c,\u7236\u7c7b\u7684\u4ee3\u7801\u5757\u6bd4\u5b50\u7c7b\u7684\u4ee3\u7801\u5757\u5148\u6267\u884c<\/p>\n<p>        <span class=\"token class-name\">A<\/span> a1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">B<\/span> b1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">B<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#061;&#061;&#061;&#061;\u6211\u662f\u4e00\u6761\u5206\u5272\u7ebf&#061;&#061;&#061;&#061;&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">A<\/span> a2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">B<\/span> b2 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">B<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165731-6abfe27b13b74.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u9759\u6001\u4ee3\u7801\u5757\u53ea\u4f1a\u6267\u884c\u4e00\u6b21<\/p>\n<p>\u521d\u59cb\u5316\u987a\u5e8f\u4e3a\u7236\u7c7b\u9759\u6001\u4ee3\u7801\u5757 \u2192 \u5b50\u7c7b\u9759\u6001\u4ee3\u7801\u5757 \u2192 \u7236\u7c7b\u5b9e\u4f8b\u4ee3\u7801\u5757 \u2192 \u7236\u7c7b\u6784\u9020\u65b9\u6cd5 \u2192 \u5b50\u7c7b\u5b9e\u4f8b\u4ee3\u7801\u5757 \u2192 \u5b50\u7c7b\u6784\u9020\u65b9\u6cd5<\/p>\n<h3>protected<\/h3>\n<p>\u5728\u7c7b\u4e0e\u5bf9\u8c61\u4e2d\u4ecb\u7ecd\u4e86 public private default \u4e09\u4e2a\u8bbf\u95ee\u4fee\u9970\u9650\u5b9a\u7b26\u3002<\/p>\n<table>\n<tr>\u540d\u79f0\u540c\u4e00\u4e2a\u5305\u540c\u7c7b\u540c\u4e00\u4e2a\u5305\u4e0d\u540c\u7c7b\u4e0d\u540c\u5305\u4e2d\u5b50\u7c7b\u4e0d\u540c\u5305\u4e2d\u7684\u975e\u5b50\u7c7b<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">public<\/td>\n<td align=\"center\">\u221a<\/td>\n<td align=\"right\">\u221a<\/td>\n<td align=\"right\">\u221a<\/td>\n<td align=\"right\">\u221a<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">protected<\/td>\n<td align=\"center\">\u221a<\/td>\n<td align=\"right\">\u221a<\/td>\n<td align=\"right\">\u221a<\/td>\n<td align=\"right\"><\/td>\n<\/tr>\n<tr>\n<td align=\"left\">default<\/td>\n<td align=\"center\">\u221a<\/td>\n<td align=\"right\">\u221a<\/td>\n<td align=\"right\"><\/td>\n<td align=\"right\"><\/td>\n<\/tr>\n<tr>\n<td align=\"left\">private<\/td>\n<td align=\"center\">\u221a<\/td>\n<td align=\"right\"><\/td>\n<td align=\"right\"><\/td>\n<td align=\"right\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u800c protected \u4e3b\u8981\u7528\u4e8e\u7ee7\u627f\u4e2d<\/p>\n<p>\u6b64\u65f6\u65b0\u5efa\u4e00\u4e2a Demo2 \u5305, \u5176\u4e2d\u5b58\u653e C Test \u7c7b , C \u7ee7\u627f A \u7c7b\u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">int<\/span>  a<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fd9\u662f\u4e00\u4e2aA\u7c7b\u4e2d\u88ab protected \u4fee\u9970\u7684\u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token class-name\">Demo1<\/span><span class=\"token punctuation\">.<\/span><span class=\"token class-name\">A<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">C<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">c_Test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span>a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">C<\/span> c1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">C<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        c1<span class=\"token punctuation\">.<\/span><span class=\"token function\">c_Test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">import<\/span> <span class=\"token import\"><span class=\"token class-name\">Demo1<\/span><span class=\"token punctuation\">.<\/span><span class=\"token class-name\">A<\/span><\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Test<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">A<\/span> a1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        a1<span class=\"token punctuation\">.<\/span><span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165731-6abfe27b27e58.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<hr \/>\n<p>\u90a3\u4e48\u8ba9 A \u4e2d\u51fa\u73b0\u4e00\u4e2a\u88ab private \u4fee\u9970\u7684\u53d8\u91cf<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">int<\/span>  a<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">protected<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fd9\u662f\u4e00\u4e2aA\u7c7b\u4e2d\u88ab protected \u4fee\u9970\u7684\u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">C<\/span> c1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">C<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165731-6abfe27b359d5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u901a\u8fc7\u8c03\u8bd5\u67e5\u770b\u5230, \u88ab private \u4fee\u9970\u7684\u6210\u5458\u53d8\u91cf b \u4e5f\u88ab\u96c6\u6210\u5230\u4e86\u5b50\u7c7b\u4e2d<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165731-6abfe27b44e1a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165731-6abfe27bec8e4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4f46\u662f\u5c31\u7b97\u88ab\u7ee7\u627f\u5230\u4e86\u5b50\u7c7b\u4e2d\u4e5f\u4e0d\u80fd\u8bbf\u95ee<\/p>\n<h3>\u7ee7\u627f\u7684\u65b9\u5f0f<\/h3>\n<p>Java \u4e2d\u53ea\u652f\u6301\u56db\u79cd\u7ee7\u627f\u65b9\u5f0f:<\/p>\n<ul>\n<li>\n<p>\u5355\u7ee7\u627f<\/p>\n<p>\u6700\u7b80\u5355\u7684\u7ee7\u627f\u65b9\u5f0f,\u4f8b\u5982<\/p>\n<p>     <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">B<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span>\n <\/li>\n<li>\n<p>\u4e0d\u540c\u7c7b\u7ee7\u627f\u540c\u4e00\u4e2a\u7c7b<\/p>\n<p>\u591a\u4e2a\u7c7b\u7ee7\u627f\u540c\u4e00\u4e2a\u7c7b,\u4f8b\u5982<\/p>\n<p>     <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">B<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">C<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span>\n <\/li>\n<li>\n<p>\u591a\u5c42\u7ee7\u627f Java \u4e2d\u4e0d\u652f\u6301\u591a\u7ee7\u627f,\u4f8b\u5982<\/p>\n<p>     <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">B<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">C<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">,<\/span><span class=\"token class-name\">B<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>\u53ef\u4ee5\u505a\u5230\u591a\u5c42\u7ee7\u627f,\u4f8b\u5982<\/p>\n<p>     <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">B<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">C<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">B<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span>\n <\/li>\n<\/ul>\n<p>\u4e00\u822c\u4e0d\u5e0c\u671b\u51fa\u73b0\u8d85\u8fc7\u4e09\u5c42\u7684\u7ee7\u627f\u5173\u7cfb. \u5982\u679c\u7ee7\u627f\u5c42\u6b21\u592a\u591a, \u5c31\u9700\u8981\u8003\u8651\u5bf9\u4ee3\u7801\u8fdb\u884c\u91cd\u6784\u4e86\u3002\u5982\u679c\u60f3\u4ece\u8bed\u6cd5\u4e0a\u8fdb\u884c\u9650\u5236\u7ee7\u627f, \u5c31\u53ef\u4ee5\u4f7f\u7528 final \u5173\u952e\u5b57<\/p>\n<h2>final \u5173\u952e\u5b57<\/h2>\n<p>\u53ef\u4ee5\u7528\u6765\u4fee\u9970\u53d8\u91cf\u3001\u6210\u5458\u65b9\u6cd5\u4ee5\u53ca\u7c7b\u3002<\/p>\n<h3>\u4fee\u9970\u53d8\u91cf<\/h3>\n<p>\u88ab final \u4fee\u9970\u7684\u53d8\u91cf\u5c31\u4f1a\u88ab\u89c6\u4e3a\u5e38\u91cf,\u4e0d\u5141\u8bb8\u4fee\u6539,\u7c7b\u4f3c\u4e8e C \u8bed\u8a00\u4e2d\u7684 const \u5173\u952e\u5b57\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165732-6abfe27c23914.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u4fee\u9970\u7c7b<\/h3>\n<p>\u88ab final \u4fee\u9970\u7684\u7c7b\u5c06\u4e0d\u88ab\u5141\u8bb8\u7ee7\u627f<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">final<\/span> <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p> <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">B<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165732-6abfe27c4f80c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u4fee\u9970\u6210\u5458\u65b9\u6cd5<\/h3>\n<p>\u88ab final \u4fee\u9970\u7684\u6210\u5458\u65b9\u6cd5\u4e0d\u5141\u8bb8\u88ab\u91cd\u5199,\u4f1a\u5728\u540e\u6587\u4ecb\u7ecd\u3002<\/p>\n<h2>\u591a\u6001<\/h2>\n<p>\u9762\u5411\u5bf9\u8c61\u7684\u4e09\u5927\u7279\u6027\u4e4b\u4e00,\u7b80\u5355\u70b9\u8bf4\u5c31\u662f\u4e0d\u540c\u7684\u5bf9\u8c61\u53bb\u5b8c\u6210\u540c\u4e00\u4e2a\u884c\u4e3a,\u4f1a\u4ea7\u751f\u4e0d\u540c\u7684\u72b6\u6001\u3002\u4f8b\u5982\u540c\u6837\u90fd\u662f\u5b66\u4e60 Java , \u5f20\u4e09\u5b66\u5f97\u975e\u5e38\u8f7b\u677e,\u674e\u56db\u5b66\u5f97\u975e\u5e38\u75db\u82e6\u3002\u8fd9\u5c31\u662f\u591a\u6001\u3002<\/p>\n<h3>Java \u4e2d\u591a\u6001\u7684\u5b9e\u73b0\u6761\u4ef6<\/h3>\n<p>\u5728 Java \u4e2d\u60f3\u8981\u5b9e\u73b0\u591a\u6001,\u5fc5\u987b\u6ee1\u8db3\u4ee5\u4e0b\u6761\u4ef6,\u7f3a\u4e00\u4e0d\u53ef:<\/p>\n<ul>\n<li>\n<p>\u5fc5\u987b\u5728\u7ee7\u627f\u4f53\u7cfb\u4e0b<\/p>\n<\/li>\n<li>\n<p>\u5b50\u7c7b\u5fc5\u987b\u8981\u5bf9\u7236\u7c7b\u4e2d\u65b9\u6cd5\u8fdb\u884c\u91cd\u5199<\/p>\n<\/li>\n<li>\n<p>\u901a\u8fc7\u7236\u7c7b\u7684\u5f15\u7528\u8c03\u7528\u91cd\u5199\u7684\u65b9\u6cd5<\/p>\n<\/li>\n<\/ul>\n<h3>\u65b9\u6cd5\u7684\u91cd\u5199<\/h3>\n<p>\u4e5f\u79f0\u4e3a\u8986\u76d6\u3002\u91cd\u5199\u662f\u5b50\u7c7b\u5bf9\u7236\u7c7b\u975e\u9759\u6001\u3001\u975eprivate\u4fee\u9970&#xff0c;\u975efinal\u4fee\u9970&#xff0c;\u975e\u6784\u9020\u65b9\u6cd5\u7b49\u7684\u5b9e\u73b0\u8fc7\u7a0b\u8fdb\u884c\u91cd\u65b0\u7f16\u5199, \u8fd4\u56de\u503c\u548c\u5f62\u53c2\u90fd\u4e0d\u80fd\u6539\u53d8\u3002 \u5373\u5916\u58f3\u4e0d\u53d8&#xff0c;\u6838\u5fc3\u91cd\u5199&#xff01;\u91cd\u5199\u7684\u597d\u5904\u5728\u4e8e\u5b50\u7c7b\u53ef\u4ee5\u6839\u636e\u9700\u8981&#xff0c;\u5b9a\u4e49\u7279\u5b9a\u4e8e\u81ea\u5df1\u7684\u884c\u4e3a\u3002 \u4e5f\u5c31\u662f\u8bf4\u5b50\u7c7b\u80fd\u591f\u6839\u636e\u9700\u8981\u5b9e\u73b0\u7236\u7c7b\u7684\u65b9\u6cd5\u3002<\/p>\n<hr \/>\n<h4>\u89c4\u5219<\/h4>\n<p>\u5b50\u7c7b\u5728\u91cd\u5199\u7236\u7c7b\u7684\u65b9\u6cd5\u65f6&#xff0c;\u4e00\u822c\u5fc5\u987b\u4e0e\u7236\u7c7b\u65b9\u6cd5\u539f\u578b\u4e00\u81f4&#xff1a; \u8fd4\u56de\u503c\u7c7b\u578b \u3001\u65b9\u6cd5\u540d \u3001(\u53c2\u6570\u5217\u8868) \u8981\u5b8c\u5168\u4e00\u81f4\u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p> <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">A<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>     <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n         <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fd9\u662f A \u7c7b\u4e2d\u7684test1\u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n     <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo1<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">B<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fd9\u662f B \u7c7b\u4e2d\u7684test1\u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">A<\/span> a1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">A<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">B<\/span> b1 <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">B<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        a1<span class=\"token punctuation\">.<\/span><span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        b1<span class=\"token punctuation\">.<\/span><span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165732-6abfe27c7480a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>&#064;Override \u8868\u793a\u8be5\u65b9\u6cd5\u88ab\u91cd\u5199,\u7f16\u8bd1\u5668\u4f1a\u591a\u4e00\u5c42\u6821\u9a8c<\/p>\n<ul>\n<li>\u88ab\u91cd\u5199\u7684\u65b9\u6cd5\u8fd4\u56de\u503c\u7c7b\u578b\u53ef\u4ee5\u4e0d\u540c&#xff0c;\u4f46\u662f\u5fc5\u987b\u662f\u5177\u6709\u7236\u5b50\u5173\u7cfb\u7684<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261002165732-6abfe27c81c94.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<ul>\n<li>\u8bbf\u95ee\u6743\u9650\u4e0d\u80fd\u6bd4\u7236\u7c7b\u4e2d\u88ab\u91cd\u5199\u7684\u65b9\u6cd5\u7684\u8bbf\u95ee\u6743\u9650\u66f4\u4f4e<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"2026-10-03mbgitzbzto4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u91cc B \u7c7b\u4e2d\u6ca1\u5199\u4fee\u9970\u7b26\u9ed8\u8ba4\u4e3a default , \u7f16\u8bd1\u62a5\u9519\u3002<\/p>\n<h3>\u91cd\u5199\u548c\u91cd\u8f7d<\/h3>\n<table>\n<tr>\u91cd\u5199\\\\\u91cd\u8f7d\u53c2\u6570\u5217\u8868\u65b9\u6cd5\u540d\u8fd4\u56de\u503c\u8bbf\u95ee\u4fee\u9970\u9650\u5b9a\u7b26<\/tr>\n<tbody>\n<tr>\n<td>\u91cd\u5199<\/td>\n<td>\u5fc5\u987b\u76f8\u540c<\/td>\n<td>\u5fc5\u987b\u76f8\u540c<\/td>\n<td>\u5fc5\u987b\u76f8\u540c,\u4e0d\u540c\u5fc5\u987b\u5177\u6709\u7236\u5b50\u7c7b\u5173\u7cfb<\/td>\n<td>\u6743\u9650\u5927\u4e8e\u7b49\u4e8e\u88ab\u91cd\u5199\u7684\u65b9\u6cd5<\/td>\n<\/tr>\n<tr>\n<td>\u91cd\u8f7d<\/td>\n<td>\u5fc5\u987b\u4e0d\u540c<\/td>\n<td>\u5fc5\u987b\u76f8\u540c<\/td>\n<td>\u53ef\u4ee5\u4e0d\u540c<\/td>\n<td>\u53ef\u4ee5\u4e0d\u540c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>\u91cd\u5199\u7684\u539f\u5219<\/h3>\n<p>\u5bf9\u4e8e\u5df2\u7ecf\u6295\u5165\u4f7f\u7528\u7684\u7c7b&#xff0c;\u5c3d\u91cf\u4e0d\u8981\u8fdb\u884c\u4fee\u6539\u3002\u6700\u597d\u7684\u65b9\u5f0f\u662f&#xff1a;\u91cd\u65b0\u5b9a\u4e49\u4e00\u4e2a\u65b0\u7684\u7c7b&#xff0c;\u6765\u91cd\u590d\u5229\u7528\u5176\u4e2d\u5171\u6027\u7684\u5185\u5bb9&#xff0c;\u5e76\u4e14\u6dfb\u52a0\u6216\u8005\u6539\u52a8\u65b0\u7684\u5185\u5bb9\u3002<\/p>\n<hr \/>\n<p>\u901a\u8fc7\u91cd\u5199,\u53ef\u4ee5\u8ba9\u540c\u4e00\u4e2a\u65b9\u6cd5\u5728\u88ab\u4e0d\u540c\u7c7b\u578b\u7684\u5bf9\u8c61\u4f7f\u7528\u65f6\u53d1\u751f\u4e0d\u540c\u7684\u884c\u4e3a,\u8fd9\u6b63\u662f\u591a\u6001\u7684\u4f53\u73b0\u3002<\/p>\n<h3>\u5411\u4e0a\u8f6c\u578b\u4e0e\u52a8\u6001\u7ed1\u5b9a<\/h3>\n<p>\u73b0\u5728\u65b0\u521b\u5efa Animal Dog Cat \u7c7b<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&#061;<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>habit <span class=\"token operator\">&#061;<\/span> habit<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u996d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">,<\/span> habit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u72d7\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Cat<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">,<\/span> habit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u732b\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5b9e\u9645\u5c31\u662f\u521b\u5efa\u4e00\u4e2a\u5b50\u7c7b\u5bf9\u8c61&#xff0c;\u5c06\u5176\u5f53\u6210\u7236\u7c7b\u5bf9\u8c61\u6765\u4f7f\u7528\u3002\u53d1\u751f\u5728\u4e09\u79cd\u60c5\u51b5\u4e2d:<\/p>\n<ul>\n<li>\u76f4\u63a5\u5728\u521b\u5efa\u5bf9\u8c61\u65f6\u53d1\u751f\u5411\u4e0a\u8f6c\u578b<\/li>\n<\/ul>\n<p>        <span class=\"token class-name\">Animal<\/span> animal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5927\u9ec4&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;\u51fa\u53bb\u73a9&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5728\u8fd9\u91cc new Dog \u662f\u5b9e\u4f8b\u5316\u7684\u4e00\u4e2a Dog \u7c7b\u5bf9\u8c61,\u800c Animal \u7c7b\u5bf9\u8c61 animal \u5374\u80fd\u5f15\u7528\u8fd9\u4e2a\u5bf9\u8c61,\u5c31\u662f\u5728\u6b64\u5904\u53d1\u751f\u4e86\u5411\u4e0a\u8f6c\u578b\u3002<\/p>\n<p><img decoding=\"async\" src=\"2026-10-03bhfiywxbdmk.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u800c Animal \u7c7b\u578b\u7684\u5bf9\u8c61 animal \u5728\u8c03\u7528 eat \u65b9\u6cd5\u65f6\u8f93\u51fa\u7684\u662f Dog \u7c7b\u4e2d\u7684 eat \u65b9\u6cd5\u3002\u8fd9\u662f\u53d1\u751f\u4e86\u52a8\u6001\u7ed1\u5b9a&#xff0c;JVM \u53d1\u73b0 animal \u5b9e\u9645\u662f Dog&#xff0c;\u5c31\u8c03\u7528 Dog \u7684 eat\u3002<\/p>\n<ul>\n<li>\u65b9\u6cd5\u4f20\u53c2\u65f6\u53d1\u751f\u5411\u4e0a\u8f6c\u578b:<\/li>\n<\/ul>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#061;<\/span> name<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>age <span class=\"token operator\">&#061;<\/span> age<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>habit <span class=\"token operator\">&#061;<\/span> habit<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Animal<\/span> animal<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u8fd9\u662f Animal \u7c7b\u7684 test1 \u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u996d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">,<\/span> habit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u72d7\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Animal<\/span> animal<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u8fd9\u662f Dog \u7c7b\u7684 test1 \u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5927\u9ec4&#034;<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token string\">&#034;\u51fa\u53bb\u73a9&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Animal<\/span> animal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span>dog<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-03tg0rhfvc4ac.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<ul>\n<li>\u65b9\u6cd5\u8fd4\u56de\u503c\u53d1\u751f\u5411\u4e0a\u8f6c\u578b<\/li>\n<\/ul>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">,<\/span> habit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u72d7\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Animal<\/span> animal<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u8fd9\u662f Dog \u7c7b\u7684 test1 \u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token function\">test2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">Animal<\/span> animal <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">test2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-031weru5z5xhf.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8c03\u8bd5\u7a97\u53e3\u53ef\u4ee5\u770b\u5230\u4e5f\u6210\u529f\u8d4b\u503c\u4e86\u3002<\/p>\n<hr \/>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f,\u4e0d\u80fd\u8c03\u7528\u5230\u5b50\u7c7b\u7279\u6709\u7684\u65b9\u6cd5<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo2<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span> habit<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span>name<span class=\"token punctuation\">,<\/span> age<span class=\"token punctuation\">,<\/span> habit<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">super<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u6b63\u5728\u5403\u72d7\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test1<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Animal<\/span> animal<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span>name <span class=\"token operator\">&#043;<\/span> <span class=\"token string\">&#034;\u8fd9\u662f Dog \u7c7b\u7684 test1 \u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token function\">test2<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">test3<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u8fd9\u662f Dog \u7c7b\u72ec\u6709\u7684 test3 \u65b9\u6cd5&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">Animal<\/span> animal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">test3<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-03m0h2zri0ehr.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u5411\u4e0b\u8f6c\u578b<\/h3>\n<p>\u5c06\u4e00\u4e2a\u5b50\u7c7b\u5bf9\u8c61\u7ecf\u8fc7\u5411\u4e0a\u8f6c\u578b\u4e4b\u540e\u5f53\u6210\u7236\u7c7b\u65b9\u6cd5\u4f7f\u7528&#xff0c;\u518d\u65e0\u6cd5\u8c03\u7528\u5b50\u7c7b\u7684\u65b9\u6cd5&#xff0c;\u4f46\u6709\u65f6\u5019\u53ef\u80fd\u9700\u8981\u8c03\u7528\u5b50\u7c7b\u7279\u6709\u7684\u65b9\u6cd5&#xff0c;\u6b64\u65f6&#xff1a;\u5c06\u7236\u7c7b\u5f15\u7528\u518d\u8fd8\u539f\u4e3a\u5b50\u7c7b\u5bf9\u8c61\u5373\u53ef&#xff0c;\u5373\u5411\u4e0b\u8f6c\u578b\u3002<\/p>\n<p>        <span class=\"token class-name\">Animal<\/span> animal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">)<\/span> animal<span class=\"token punctuation\">;<\/span><br \/>\n        dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">test3<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-03g3m5ca0ovou.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\u5411\u4e0b\u8f6c\u578b\u4f1a\u7528\u5230\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362,\u8fd9\u672c\u6765\u5c31\u662f\u4e0d\u5b89\u5168\u7684\u3002\u5982\u679c\u8f6c\u6362\u5931\u8d25,\u8fd0\u884c\u65f6\u4f1a\u629b\u51fa\u5f02\u5e38\u3002Java \u4e2d\u4e3a\u4e86\u63d0\u9ad8\u5411\u4e0b\u8f6c\u578b\u65f6\u7684\u5b89\u5168\u6027,\u5f15\u5165\u4e86 instanceof \u5173\u952e\u5b57\u3002<\/p>\n<p><img decoding=\"async\" src=\"2026-10-03fyridxgk3yv.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>        <span class=\"token class-name\">Animal<\/span> animal <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>animal <span class=\"token keyword\">instanceof<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">)<\/span> animal<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token keyword\">else<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e0d\u80fd\u8fd9\u4e48\u8f6c\u6362!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-03eupf4u4bnai.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u591a\u6001\u7684\u4f7f\u7528<\/h3>\n<p>\u6b64\u65f6\u65b0\u5efa\u53e6\u4e00\u4e2a\u5305 Demo3,\u5728\u8fd9\u4e2a\u5305\u4e0b\u65b0\u5efa Animal Dog Cat Bird Fish \u7c7b,Dog Cat Bird Fish \u7ee7\u627f Animal \u3002<\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo3<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Animal<\/span> <span class=\"token punctuation\">{<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5403\u996d!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo3<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Dog<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5403\u72d7\u7cae!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo3<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Cat<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5403\u732b\u7cae&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo3<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Bird<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5403\u866b\u5b50!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">package<\/span> <span class=\"token class-name\">Demo3<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">Fish<\/span> <span class=\"token keyword\">extends<\/span> <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token annotation punctuation\">&#064;Override<\/span><br \/>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5403\u86af\u8693!&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u73b0\u5728\u60f3\u8f93\u51fa\u6bcf\u4e2a\u7c7b\u7684 eat \u65b9\u6cd5\u3002\u91c7\u7528\u5206\u652f\u8bed\u53e5\u53ef\u80fd\u8981\u8fd9\u4e48\u5199<\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Cat<\/span> cat <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Bird<\/span> bird <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Bird<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Fish<\/span> fish <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Fish<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> animals <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span>dog<span class=\"token punctuation\">,<\/span>cat<span class=\"token punctuation\">,<\/span>bird<span class=\"token punctuation\">,<\/span>fish<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Animal<\/span> animal<span class=\"token operator\">:<\/span> animals<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>dog<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                dog<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>cat<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                cat<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>bird<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                bird<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">equals<\/span><span class=\"token punctuation\">(<\/span>fish<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n                fish<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-03fl0rowslf55.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u800c\u662f\u7528\u591a\u6001\u7684\u8bdd\u5c31\u7b80\u5355\u591a\u4e86<\/p>\n<p>        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Cat<\/span> cat <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Bird<\/span> bird <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Bird<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Fish<\/span> fish <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Fish<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> animals <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span>dog<span class=\"token punctuation\">,<\/span>cat<span class=\"token punctuation\">,<\/span>bird<span class=\"token punctuation\">,<\/span>fish<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Animal<\/span> animal<span class=\"token operator\">:<\/span> animals<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-035f14hwmeg4k.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u65b0\u589e\u4e00\u4e2a Monkey \u7c7b<\/p>\n<p><img decoding=\"async\" src=\"2026-10-03lz2xin1y53h.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u65f6\u8981\u8f93\u51fa\u8fd9\u4e2a Monkey \u7c7b\u7684 eat() \u65b9\u6cd5\u4f7f\u7528\u591a\u6001\u5b8c\u6210\u4e5f\u66f4\u7b80\u5355<\/p>\n<p>        <span class=\"token class-name\">Dog<\/span> dog <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Dog<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Cat<\/span> cat <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Cat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Bird<\/span> bird <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Bird<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Fish<\/span> fish <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Fish<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Monkey<\/span> monkey <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Monkey<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">Animal<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> animals <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">{<\/span>dog<span class=\"token punctuation\">,<\/span>cat<span class=\"token punctuation\">,<\/span>bird<span class=\"token punctuation\">,<\/span>fish<span class=\"token punctuation\">,<\/span>monkey<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">for<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Animal<\/span> animal<span class=\"token operator\">:<\/span> animals<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n            animal<span class=\"token punctuation\">.<\/span><span class=\"token function\">eat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-0334iyxwy22hv.png\" 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class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;B\u7c7b\u4e2d\u7684func\u65b9\u6cd5\u6267\u884c\u4e86&#034;<\/span><span class=\"token operator\">&#043;<\/span>num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>        <span class=\"token class-name\">B<\/span> b <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">B<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p><img decoding=\"async\" src=\"2026-10-03dwtgghxomaz.png\" 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