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<!doctype html>
<html class="no-js" lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>
Pumpkinor.io
</title>
<link href="atom.xml" rel="alternate" title="Pumpkinor.io" type="application/atom+xml">
<link rel="stylesheet" href="asset/css/foundation.min.css" />
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<script type="text/javascript">
function before_search(){
var searchVal = 'site:pumpkinor.github.io ' + document.getElementById('search_input').value;
document.getElementById('search_q').value = searchVal;
return true;
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<span> Pumpkinor.io</span>
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<li><a target="_blank" href="about.html">About</a></li>
<li><label>Categories</label></li>
<li><a href="%E7%AC%94%E8%AE%B0-%E9%9D%9E%E5%8E%9F%E5%88%9B.html">笔记-非原创</a></li>
<li><a href="configuration.html">configuration</a></li>
<li><a href="after%20read.html">after read</a></li>
<li><a href="Memo.html">Memo</a></li>
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<div class="markdown-body home-categories">
<div class="article">
<a class="clearlink" href="16348300798689.html">
<h1>关于相等的判断</h1>
<div class="a-content">
<div class="a-content-text">
<h4><a id="%E6%91%98%E5%BD%95" class="anchor" aria-hidden="true"><span class="octicon octicon-link"></span></a>摘录</h4>
<p>首先，我们要注意 equals 和 == 的区别。业务代码中进行内容的比较，针对基本类型只能使用 ==，针对 Integer、String 在内的引用类型，需要使用 equals。Integer 和 String 的坑在于，使用 == 判等有时也能获得正确结果。<br />
其次，对于自定义类型，如果类型需要参与判等，那么务必同时实现 equals 和 hashCode 方法，并确保逻辑一致。<br />
如果希望快速实现 equals、hashCode 方法，我们可以借助 IDE 的代码生成功能，或使用 Lombok 来生成。如果类型也要参与比较，那么 compareTo 方法的逻辑同样需要和 equals、hashCode 方法一致。最后，Lombok 的 @EqualsAndHashCode 注解实现 equals 和 hashCode 的时候，默认使用类型所有非 static、非 transient 的字段，且不考虑父类。如果希望改变这种默认行为，可以使用 @EqualsAndHashCode.Exclude 排除一些字段，并设置 callSuper = true 来让子类的 equals 和 hashCode 调用父类的相应方法。</p>
</div>
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</a>
<div class="read-more clearfix">
<div class="more-left left">
<span class="date">2021/10/21</span>
<span>posted in </span>
<span class="posted-in"><a href='Java%20Mistake%20100.html'>Java Mistake 100</a></span>
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<a href="%E7%AC%94%E8%AE%B0-%E9%9D%9E%E5%8E%9F%E5%88%9B.html"><strong>笔记-非原创</strong></a>
<a href="configuration.html"><strong>configuration</strong></a>
<a href="after%20read.html"><strong>after read</strong></a>
<a href="Memo.html"><strong>Memo</strong></a>
</p>
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<a href="16512948238106.html"></a>
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<a href="16381018403104.html">2021/11/28 算法学习开始</a>
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<a href="16356092078092.html">异步处理</a>
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Powered by <a target="_blank" href="http://www.mweb.im">MWeb</a>,
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