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<p>观察发现，<strong>在哈希表中进行增删查改的时间复杂度都是 <span class="arithmatex">\(O(1)\)</span></strong> ，非常高效。</p>
<h2 id="611">6.1.1. &nbsp; 哈希表常用操作<a class="headerlink" href="#611" title="Permanent link">&para;</a></h2>
<p>哈希表的常见操作包括：初始化、查询操作、添加键值对和删除键值对等。</p>
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<div class="highlight"><span class="filename">hash_map.java</span><pre><span></span><code><a id="__codelineno-0-1" name="__codelineno-0-1" href="#__codelineno-0-1"></a><span class="cm">/* 初始化哈希表 */</span>
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<p>哈希表有三种常用遍历方式：遍历键值对、遍历键和遍历值。</p>
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<div class="highlight"><span class="filename">hash_map.java</span><pre><span></span><code><a id="__codelineno-12-1" name="__codelineno-12-1" href="#__codelineno-12-1"></a><span class="cm">/* 遍历哈希表 */</span>
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<p align="center"> Fig. 哈希函数工作原理 </p>
<p>以下代码实现了一个简单哈希表。其中，我们将 <code>key</code> 和 <code>value</code> 封装成一个类 <code>Pair</code> ，以表示键值对。</p>
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<div class="highlight"><span class="filename">array_hash_map.java</span><pre><span></span><code><a id="__codelineno-25-1" name="__codelineno-25-1" href="#__codelineno-25-1"></a><span class="cm">/* 键值对 */</span>