{"id":774,"date":"2022-10-08T22:11:00","date_gmt":"2022-10-08T14:11:00","guid":{"rendered":"https:\/\/qaqaq.top\/?p=774"},"modified":"2022-11-27T12:39:54","modified_gmt":"2022-11-27T04:39:54","slug":"%e9%9d%a2%e5%90%91%e5%af%b9%e8%b1%a1%e4%b8%ad-%e5%a4%8d%e4%b9%a0%ef%bc%9aobject%e7%b1%bb%e5%8f%8a%e5%86%85%e9%83%a8%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=774","title":{"rendered":"\u9762\u5411\u5bf9\u8c61(\u4e2d)-\u590d\u4e60\uff1aObject\u7c7b\u53ca\u5185\u90e8\u65b9\u6cd5"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P313;\r\n\r\nimport java.util.Objects;\r\n\r\npublic class Person {\r\n\r\n\tString name;\r\n\tint age;\r\n\r\n\tpublic Person(String name, int age) {\r\n\t\tthis.name = name;\r\n\t\tthis.age = age;\r\n\t}\r\n\r\n\tpublic void eat() {\r\n\t\tSystem.out.println(\"\u4eba\uff1a\u5403\u996d\");\r\n\t}\r\n\r\n\tpublic void walk() {\r\n\t\tSystem.out.println(\"\u4eba\uff1a\u8d70\u8def\");\r\n\t}\r\n\r\n\t@Override\r\n\tpublic boolean equals(Object obj) {\r\n\t\tif (this == obj)\r\n\t\t\treturn true;\r\n\t\tif (obj == null)\r\n\t\t\treturn false;\r\n\t\tif (getClass() != obj.getClass())\r\n\t\t\treturn false;\r\n\t\tPerson other = (Person) obj;\r\n\t\treturn age == other.age &amp;&amp; Objects.equals(name, other.name);\r\n\t}\r\n\r\n\/\/\t@Override\r\n\/\/\tpublic boolean equals(Object obj) {\r\n\/\/\t\tif(obj == this) {\r\n\/\/\t\t\treturn true;\r\n\/\/\t\t}\r\n\/\/\t\t\r\n\/\/\t\tif(obj instanceof Person) {\r\n\/\/\t\t\tPerson p = (Person)obj;\r\n\/\/\t\t\treturn this.age == p.age &amp;&amp; this.name.equals(p.name);\r\n\/\/\t\t}\r\n\/\/\t\t\r\n\/\/\t\treturn false;\r\n\/\/\t}\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P313;\r\n\r\npublic class Man extends Person {\r\n\t\r\n\tpublic Man(String name, int age) {\r\n\t\tsuper(name, age);\r\n\t}\r\n\r\n\tpublic void earnMoney() {\r\n\t\tSystem.out.println(\"\u7537\u4eba\u8d1f\u8d23\u6323\u94b1\u517b\u5bb6\");\r\n\t}\r\n\t\r\n\tpublic void eat() {\r\n\t\tSystem.out.println(\"\u7537\u4eba\u591a\u5403\u8089\uff0c\u957f\u808c\u8089\");\r\n\t}\r\n\t\r\n\tpublic void walk() {\r\n\t\tSystem.out.println(\"\u7537\u4eba\u9738\u6c14\u7684\u8d70\u8def\");\r\n\t}\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P313;\r\n\r\nimport org.junit.Test;\r\n\r\npublic class ReviewTest {\r\n\r\n\t\/\/\u5173\u4e8etoString()\r\n\t@Test\r\n\tpublic void test3() {\r\n\t\tString s = \"abc\";\r\n\t\ts = null;\r\n\t\tSystem.out.println(s);\r\n\t\tSystem.out.println(\"********************\");\r\n\t\tSystem.out.println(s.toString());\/\/\u51fa\u73b0NullPointerException\r\n\t\t\r\n\t}\r\n\t\r\n\t\/\/\u533a\u522b\u624b\u52a8\u5199\u7684\u548c\u81ea\u52a8\u751f\u6210\u7684equals()\r\n\t@Test\r\n\tpublic void test2() {\r\n\t\tPerson p = new Person(\"Tom\", 12);\r\n\t\tMan m = new Man(\"Tom\", 12);\r\n\t\t\r\n\t\tSystem.out.println(p.equals(m));\r\n\t\t\r\n\t\t\r\n\t}\r\n\t\r\n\t\/\/\u6570\u7ec4\u4e5f\u4f5c\u4e3aObject\u7c7b\u7684\u5b50\u7c7b\u51fa\u73b0\uff0c\u53ef\u4ee5\u8c03\u7528Object\u7c7b\u4e2d\u58f0\u660e\u7684\u65b9\u6cd5\r\n\t@Test\r\n\tpublic void test1() {\r\n\t\tint&#91;] arr = new int&#91;] {1,2,3};\r\n\t\tprint(arr);\r\n\t\t\r\n\t\tSystem.out.println(arr.getClass().getSuperclass());\r\n\t}\r\n\t\r\n\tpublic void print(Object obj) {\r\n\t\tSystem.out.println(obj);\r\n\t}\r\n}\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":[33],"tags":[46],"class_list":["post-774","post","type-post","status-publish","format-standard","hentry","category-java-","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/774"}],"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=774"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/774\/revisions"}],"predecessor-version":[{"id":775,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/774\/revisions\/775"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=774"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=774"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=774"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}