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<p align="center"> Fig. 队列的先入先出规则 </p>
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<h2 id="521">5.2.1. 队列常用操作<a class="headerlink" href="#521" title="Permanent link">¶</a></h2>
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<p>队列的常用操作见下表,方法名需根据特定语言来确定。</p>
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<p>队列的常用操作见下表,方法名需根据语言来确定,此处以 Java 为例。</p>
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<div class="center-table">
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<table>
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<thead>
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<td><span class="arithmatex">\(O(1)\)</span></td>
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</tr>
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<tr>
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<td>front()</td>
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<td>peek()</td>
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<td>访问队首元素</td>
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<td><span class="arithmatex">\(O(1)\)</span></td>
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</tr>
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<tr>
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<td>size()</td>
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<td>获取队列的长度</td>
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<td><span class="arithmatex">\(O(1)\)</span></td>
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</tr>
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<tr>
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<td>isEmpty()</td>
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<td>判断队列是否为空</td>
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<td><span class="arithmatex">\(O(1)\)</span></td>
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</tr>
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</tbody>
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</table>
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</div>
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