{"id":63001,"date":"2026-01-21T05:49:33","date_gmt":"2026-01-20T21:49:33","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/63001.html"},"modified":"2026-01-21T05:49:33","modified_gmt":"2026-01-20T21:49:33","slug":"java-object%e7%b1%bb%e6%a0%b8%e5%bf%83%e6%96%b9%e6%b3%95%e5%85%a8%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/63001.html","title":{"rendered":"Java Object\u7c7b\u6838\u5fc3\u65b9\u6cd5\u5168\u89e3\u6790"},"content":{"rendered":"<p>\u597d\u7684&#xff0c;\u6211\u4eec\u6765\u89e3\u6790Java\u4e2d Object \u7c7b\u7684\u6838\u5fc3\u65b9\u6cd5\u3002\u4f5c\u4e3a\u6240\u6709Java\u7c7b\u7684\u6839\u7236\u7c7b&#xff0c;Object \u63d0\u4f9b\u4e86\u51e0\u4e2a\u57fa\u7840\u65b9\u6cd5&#xff0c;\u8fd9\u4e9b\u65b9\u6cd5\u901a\u5e38\u4f1a\u88ab\u5b50\u7c7b\u91cd\u5199\u4ee5\u6ee1\u8db3\u7279\u5b9a\u7684\u9700\u6c42\u3002\u4ee5\u4e0b\u662f\u5176\u6838\u5fc3\u65b9\u6cd5\u7684\u89e3\u6790&#xff1a;<\/p>\n<h4>1. equals(Object obj)<\/h4>\n<ul>\n<li>\u4f5c\u7528: \u7528\u4e8e\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\u662f\u5426\u201c\u903b\u8f91\u76f8\u7b49\u201d\u3002\u9ed8\u8ba4\u5b9e\u73b0&#xff08;\u5373 Object \u7c7b\u4e2d\u7684\u5b9e\u73b0&#xff09;\u4f7f\u7528 &#061;&#061; \u64cd\u4f5c\u7b26&#xff0c;\u6bd4\u8f83\u7684\u662f\u4e24\u4e2a\u5bf9\u8c61\u7684\u5185\u5b58\u5730\u5740\u662f\u5426\u76f8\u540c\u3002<\/li>\n<li>\u91cd\u5199\u539f\u5219: \u5f53\u6211\u4eec\u9700\u8981\u6839\u636e\u5bf9\u8c61\u7684\u5185\u5bb9&#xff08;\u5c5e\u6027\u503c&#xff09;\u6765\u5224\u65ad\u662f\u5426\u76f8\u7b49\u65f6&#xff0c;\u5c31\u9700\u8981\u91cd\u5199\u6b64\u65b9\u6cd5\u3002\u91cd\u5199\u65f6\u901a\u5e38\u9700\u8981\u6ee1\u8db3\u4ee5\u4e0b\u7ea6\u5b9a&#xff1a;\n<ul>\n<li>\u81ea\u53cd\u6027: $x.equals(x)$ \u5e94\u4e3a true<\/li>\n<li>\u5bf9\u79f0\u6027: \u82e5 $x.equals(y)$ \u4e3a true&#xff0c;\u5219 $y.equals(x)$ \u4e5f\u5e94\u4e3a true<\/li>\n<li>\u4f20\u9012\u6027: \u82e5 $x.equals(y)$ \u4e3a true \u4e14 $y.equals(z)$ \u4e3a true&#xff0c;\u5219 $x.equals(z)$ \u4e5f\u5e94\u4e3a true<\/li>\n<li>\u4e00\u81f4\u6027: \u5728\u5bf9\u8c61\u672a\u88ab\u4fee\u6539\u7684\u524d\u63d0\u4e0b&#xff0c;\u591a\u6b21\u8c03\u7528 $x.equals(y)$ \u5e94\u8fd4\u56de\u76f8\u540c\u7ed3\u679c<\/li>\n<li>\u975e\u7a7a\u6027: \u5bf9\u4e8e\u4efb\u4f55\u975e\u7a7a\u5f15\u7528 $x$, $x.equals(null)$ \u5e94\u8fd4\u56de false<\/li>\n<\/ul>\n<\/li>\n<li>\u4e0e &#061;&#061; \u7684\u533a\u522b: &#061;&#061; \u6bd4\u8f83\u7684\u662f\u5f15\u7528&#xff08;\u5185\u5b58\u5730\u5740&#xff09;&#xff0c;\u800c equals \u5728\u91cd\u5199\u540e\u53ef\u4ee5\u6bd4\u8f83\u5185\u5bb9\u3002<\/li>\n<\/ul>\n<h4>2. hashCode()<\/h4>\n<ul>\n<li>\u4f5c\u7528: \u8fd4\u56de\u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u503c\u3002\u54c8\u5e0c\u7801\u662f\u4e00\u4e2a int \u7c7b\u578b\u7684\u6574\u6570&#xff0c;\u901a\u5e38\u7528\u4e8e\u54c8\u5e0c\u8868\u6570\u636e\u7ed3\u6784&#xff08;\u5982 HashMap, HashSet) \u4e2d\u5feb\u901f\u5b9a\u4f4d\u5bf9\u8c61\u3002<\/li>\n<li>\u91cd\u5199\u539f\u5219: \u5fc5\u987b\u4e0e equals \u65b9\u6cd5\u534f\u540c\u5de5\u4f5c&#xff0c;\u5e76\u6ee1\u8db3\u4ee5\u4e0b\u91cd\u8981\u7ea6\u5b9a&#xff1a;\n<ul>\n<li>\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u6839\u636e equals \u65b9\u6cd5\u662f\u76f8\u7b49\u7684&#xff0c;\u90a3\u4e48\u5bf9\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u8c03\u7528 hashCode \u65b9\u6cd5\u5fc5\u987b\u4ea7\u751f\u76f8\u540c\u7684\u6574\u6570\u7ed3\u679c\u3002<\/li>\n<li>\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u6839\u636e equals \u65b9\u6cd5\u662f\u4e0d\u76f8\u7b49\u7684&#xff0c;\u5e76\u4e0d\u4e25\u683c\u8981\u6c42\u5b83\u4eec\u7684 hashCode \u503c\u4e0d\u540c&#xff0c;\u4f46\u4e3a\u4e0d\u540c\u7684\u5bf9\u8c61\u4ea7\u751f\u4e0d\u540c\u7684\u54c8\u5e0c\u7801\u503c\u6709\u52a9\u4e8e\u63d0\u9ad8\u54c8\u5e0c\u8868\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<\/li>\n<li>equals \u4e0e hashCode \u7684\u5173\u7cfb: \u91cd\u5199 equals \u65f6\u5fc5\u987b\u540c\u65f6\u91cd\u5199 hashCode&#xff0c;\u4ee5\u786e\u4fdd\u76f8\u7b49\u7684\u5bf9\u8c61\u5177\u6709\u76f8\u7b49\u7684\u54c8\u5e0c\u7801\u3002\u5426\u5219&#xff0c;\u5728\u4f7f\u7528\u57fa\u4e8e\u54c8\u5e0c\u7684\u96c6\u5408\u65f6\u4f1a\u5bfc\u81f4\u4e0d\u53ef\u9884\u671f\u7684\u884c\u4e3a&#xff08;\u5982\u5bf9\u8c61\u653e\u5165 HashSet \u540e\u65e0\u6cd5\u6b63\u786e\u67e5\u627e&#xff09;\u3002<\/li>\n<\/ul>\n<h4>3. toString()<\/h4>\n<ul>\n<li>\u4f5c\u7528: \u8fd4\u56de\u5bf9\u8c61\u7684\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f\u3002\u9ed8\u8ba4\u5b9e\u73b0\u8fd4\u56de\u7c7b\u540d &#043; &#064; &#043; \u5bf9\u8c61\u7684\u54c8\u5e0c\u7801\u7684\u65e0\u7b26\u53f7\u5341\u516d\u8fdb\u5236\u8868\u793a&#xff08;\u5982 java.lang.Object&#064;1b6d3586&#xff09;\u3002<\/li>\n<li>\u91cd\u5199\u539f\u5219: \u4e3a\u4e86\u63d0\u4f9b\u66f4\u6709\u610f\u4e49\u3001\u53ef\u8bfb\u6027\u66f4\u597d\u7684\u4fe1\u606f&#xff0c;\u901a\u5e38\u4f1a\u91cd\u5199\u6b64\u65b9\u6cd5&#xff0c;\u8fd4\u56de\u5305\u542b\u5bf9\u8c61\u5173\u952e\u5c5e\u6027\u503c\u7684\u5b57\u7b26\u4e32\u3002\u8fd9\u5bf9\u4e8e\u8c03\u8bd5\u548c\u65e5\u5fd7\u8bb0\u5f55\u975e\u5e38\u6709\u7528\u3002<\/li>\n<\/ul>\n<h4>4. clone()<\/h4>\n<ul>\n<li>\u4f5c\u7528: \u521b\u5efa\u5e76\u8fd4\u56de\u5f53\u524d\u5bf9\u8c61\u7684\u4e00\u4e2a\u526f\u672c&#xff08;\u62f7\u8d1d&#xff09;\u3002<\/li>\n<li>\u7279\u70b9:\n<ul>\n<li>\u65b9\u6cd5\u58f0\u660e\u4e3a protected&#xff0c;\u610f\u5473\u7740\u53ea\u80fd\u5728\u7c7b\u5185\u90e8\u6216\u5176\u5b50\u7c7b\u4e2d\u8c03\u7528\u3002<\/li>\n<li>\u7c7b\u5fc5\u987b\u5b9e\u73b0 Cloneable \u63a5\u53e3&#xff0c;\u5426\u5219\u8c03\u7528 clone() \u4f1a\u629b\u51fa CloneNotSupportedException\u3002<\/li>\n<li>\u9ed8\u8ba4\u5b9e\u73b0\u8fdb\u884c\u7684\u662f\u6d45\u62f7\u8d1d&#xff1a;\u5b83\u590d\u5236\u539f\u59cb\u5bf9\u8c61\u7684\u6240\u6709\u5b57\u6bb5\u503c\u3002\u5982\u679c\u5b57\u6bb5\u662f\u57fa\u672c\u7c7b\u578b&#xff0c;\u5219\u590d\u5236\u503c\u672c\u8eab&#xff1b;\u5982\u679c\u5b57\u6bb5\u662f\u5bf9\u8c61\u5f15\u7528&#xff0c;\u5219\u590d\u5236\u7684\u662f\u5f15\u7528\u503c&#xff08;\u5373\u65b0\u5bf9\u8c61\u548c\u539f\u59cb\u5bf9\u8c61\u5171\u4eab\u540c\u4e00\u4e2a\u5f15\u7528\u6307\u5411\u7684\u5bf9\u8c61&#xff09;\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u6df1\u62f7\u8d1d: \u5982\u679c\u9700\u8981\u62f7\u8d1d\u5f15\u7528\u7684\u5bf9\u8c61\u672c\u8eab&#xff08;\u800c\u4e0d\u4ec5\u4ec5\u662f\u5f15\u7528&#xff09;&#xff0c;\u5fc5\u987b\u5728\u91cd\u5199\u7684 clone \u65b9\u6cd5\u4e2d\u663e\u5f0f\u5904\u7406\u8fd9\u4e9b\u5f15\u7528\u7c7b\u578b\u7684\u5b57\u6bb5\u3002<\/li>\n<\/ul>\n<h4>5. wait(), notify(), notifyAll()<\/h4>\n<ul>\n<li>\u4f5c\u7528: \u8fd9\u4e09\u4e2a\u65b9\u6cd5\u7528\u4e8e\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u7684\u534f\u4f5c\u548c\u901a\u4fe1&#xff08;\u7ebf\u7a0b\u540c\u6b65&#xff09;\u3002<\/li>\n<li>\u4f7f\u7528\u524d\u63d0: \u5fc5\u987b\u5728 synchronized \u540c\u6b65\u5757\u6216\u65b9\u6cd5\u5185\u90e8\u8c03\u7528\u3002\u8c03\u7528\u5b83\u4eec\u7684\u5bf9\u8c61&#xff08;\u901a\u5e38\u662f\u5171\u4eab\u8d44\u6e90&#xff09;\u4f5c\u4e3a\u9501\u5bf9\u8c61\u3002<\/li>\n<li>\u529f\u80fd:\n<ul>\n<li>wait(): \u4f7f\u5f53\u524d\u7ebf\u7a0b\u7b49\u5f85&#xff0c;\u76f4\u5230\u5176\u4ed6\u7ebf\u7a0b\u8c03\u7528\u6b64\u5bf9\u8c61\u7684 notify() \u6216 notifyAll() \u65b9\u6cd5\u5c06\u5176\u5524\u9192&#xff0c;\u6216\u8005\u7b49\u5f85\u8d85\u65f6\u3002<\/li>\n<li>notify(): \u5524\u9192\u5728\u6b64\u5bf9\u8c61\u7684\u76d1\u89c6\u5668\u4e0a\u7b49\u5f85\u7684\u4e00\u4e2a&#xff08;\u4efb\u610f\u9009\u62e9\u7684&#xff09;\u7ebf\u7a0b\u3002<\/li>\n<li>notifyAll(): \u5524\u9192\u5728\u6b64\u5bf9\u8c61\u7684\u76d1\u89c6\u5668\u4e0a\u7b49\u5f85\u7684\u6240\u6709\u7ebf\u7a0b\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u66ff\u4ee3\u65b9\u6848: \u5728\u66f4\u73b0\u4ee3\u7684\u5e76\u53d1\u7f16\u7a0b\u4e2d&#xff0c;\u901a\u5e38\u63a8\u8350\u4f7f\u7528 java.util.concurrent \u5305\u4e0b\u7684\u9ad8\u7ea7\u5de5\u5177&#xff08;\u5982 Lock, Condition&#xff09;\u6765\u4ee3\u66ff\u76f4\u63a5\u4f7f\u7528 wait\/notify\u3002<\/li>\n<\/ul>\n<h4>\u793a\u4f8b&#xff1a;\u91cd\u5199 equals \u548c hashCode<\/h4>\n<p>public class Person {<br \/>\n    private String name;<br \/>\n    private int age;<\/p>\n<p>    \/\/ &#8230; \u6784\u9020\u65b9\u6cd5\u3001Getter\u3001Setter \u7701\u7565 &#8230;<\/p>\n<p>    &#064;Override<br \/>\n    public boolean equals(Object o) {<br \/>\n        if (this &#061;&#061; o) return true; \/\/ \u540c\u4e00\u4e2a\u5bf9\u8c61<br \/>\n        if (o &#061;&#061; null || getClass() !&#061; o.getClass()) return false; \/\/ \u7c7b\u578b\u4e0d\u540c<br \/>\n        Person person &#061; (Person) o;<br \/>\n        return age &#061;&#061; person.age &amp;&amp; Objects.equals(name, person.name); \/\/ \u6bd4\u8f83\u5b57\u6bb5\u5185\u5bb9<br \/>\n    }<\/p>\n<p>    &#064;Override<br \/>\n    public int hashCode() {<br \/>\n        return Objects.hash(name, age); \/\/ \u4f7f\u7528\u76f8\u540c\u7684\u5b57\u6bb5\u8ba1\u7b97\u54c8\u5e0c\u7801<br \/>\n    }<br \/>\n}<\/p>\n<p>https:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTY5My5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTkxMA5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NjAwNw5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NjAwMg5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTg0Nw5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTc5Mg5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTU5Mw5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTgzMw5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTY3NA5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTgxNA5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTc2NA5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTgwNg5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTc1Nw5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTc1Ng5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTQ4OQ5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTYzOQ5zaHRtbA&#061;&#061;.html<br \/>\nhttps:\/\/tv.sohu.com\/v\/dXMvNDQxNzIwNDc5LzY5NTU5NTU1MA5zaHRtbA&#061;&#061;.html<br 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