{"id":733,"date":"2022-10-06T22:57:32","date_gmt":"2022-10-06T14:57:32","guid":{"rendered":"https:\/\/qaqaq.top\/?p=733"},"modified":"2022-11-27T12:39:55","modified_gmt":"2022-11-27T04:39:55","slug":"%e9%9d%a2%e5%90%91%e5%af%b9%e8%b1%a1%e4%b8%ad-%e5%a4%9a%e6%80%81%e6%80%a7%e7%bb%83%e4%b9%a0%ef%bc%9a%e5%9f%ba%e6%9c%ac%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=733","title":{"rendered":"\u9762\u5411\u5bf9\u8c61(\u4e2d)-\u591a\u6001\u6027\u7ec3\u4e60\uff1a\u57fa\u672c\u64cd\u4f5c"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P291;\r\n\/*\r\n * \u5efa\u7acbInstanceTest \u7c7b\uff0c\u5728\u7c7b\u4e2d\u5b9a\u4e49\u65b9\u6cd5method(Person e);\r\n\t\u5728method\u4e2d:\r\n\t(1)\u6839\u636ee\u7684\u7c7b\u578b\u8c03\u7528\u76f8\u5e94\u7c7b\u7684getInfo()\u65b9\u6cd5\u3002\r\n\t(2)\u6839\u636ee\u7684\u7c7b\u578b\u6267\u884c\uff1a\r\n\t\u5982\u679ce\u4e3aPerson\u7c7b\u7684\u5bf9\u8c61\uff0c\u8f93\u51fa\uff1a\r\n\t\u201ca person\u201d;\r\n\t\u5982\u679ce\u4e3aStudent\u7c7b\u7684\u5bf9\u8c61\uff0c\u8f93\u51fa\uff1a\r\n\t\u201ca student\u201d\r\n\t\u201ca person \u201d \r\n\t\u5982\u679ce\u4e3aGraduate\u7c7b\u7684\u5bf9\u8c61\uff0c\u8f93\u51fa\uff1a\r\n\t\u201ca graduated student\u201d\r\n\t\u201ca student\u201d\r\n\t\u201ca person\u201d \r\n * \r\n * \r\n * \r\n * \r\n * \r\n * \r\n *\/\r\npublic class InstanceTest {\r\n\r\n\tpublic static void main(String&#91;] args) {\r\n\t\t\r\n\t\t\/\/\u865a\u62df\u65b9\u6cd5\u8c03\u7528\r\n\t\tInstanceTest test = new InstanceTest();\r\n\t\ttest.method(new Student());\r\n\t}\r\n\t\r\n\tpublic void method(Person e) {\r\n\t\t\r\n\t\tString info = e.getInfo();\r\n\t\tSystem.out.println(info);\r\n\t\t\r\n\t\t\/\/\u65b9\u5f0f\u4e00\r\n\/\/\t\tif (e instanceof Graduate) {\r\n\/\/\t\t\tSystem.out.println(\"a graduated student\");\r\n\/\/\t\t\tSystem.out.println(\"a student\");\r\n\/\/\t\t\tSystem.out.println(\"a person\");\r\n\/\/\t\t}else if(e instanceof Student) {\r\n\/\/\t\t\tSystem.out.println(\"a student\");\r\n\/\/\t\t\tSystem.out.println(\"a person\");\r\n\/\/\t\t}else {\r\n\/\/\t\t\tSystem.out.println(\"a person\");\r\n\/\/\t\t}\r\n\t\t\r\n\t\t\/\/\u65b9\u5f0f\u4e8c\r\n\t\tif (e instanceof Graduate) {\r\n\t\t\tSystem.out.println(\"a graduated student\");\r\n\t\t}\r\n\t\tif (e instanceof Student) {\r\n\t\t\tSystem.out.println(\"a student\");\r\n\t\t}\r\n\t\tif (e instanceof Person) {\r\n\t\t\tSystem.out.println(\"a person\");\r\n\t\t}\r\n\t}\r\n}\r\n\r\nclass Person {\r\n\r\n\tprotected String name = \"person\";\r\n\r\n\tprotected int age = 50;\r\n\r\n\tpublic String getInfo() {\r\n\r\n\t\treturn \"Name: \" + name + \"\\n\" + \"age: \" + age;\r\n\r\n\t}\r\n}\r\n\r\nclass Student extends Person {\r\n\r\n\tprotected String school = \"pku\";\r\n\r\n\tpublic String getInfo() {\r\n\r\n\t\treturn \"Name: \" + name + \"\\nage: \" + age\r\n\r\n\t\t\t\t+ \"\\nschool: \" + school;\r\n\r\n\t}\r\n}\r\n\r\nclass Graduate extends Student {\r\n\r\n\tpublic String major = \"IT\";\r\n\r\n\tpublic String getInfo()\r\n\r\n\t{\r\n\r\n\t\treturn \"Name: \" + name + \"\\nage: \" + age\r\n\r\n\t\t\t\t+ \"\\nschool: \" + school + \"\\nmajor:\" + major;\r\n\r\n\t}\r\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[46],"class_list":["post-733","post","type-post","status-publish","format-standard","hentry","category-java-code","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/733"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=733"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/733\/revisions"}],"predecessor-version":[{"id":734,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/733\/revisions\/734"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=733"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=733"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=733"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}