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<h2 id="概述"><a href="#概述" class="headerlink" title="概述"></a>概述</h2><p>到底什么是ThreadLocal？ 我们先来看看JDK里是怎么说的(JDK1.8)。<br>
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7分
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<h2 id="索引目的"><a href="#索引目的" class="headerlink" title="索引目的"></a>索引目的</h2><p>索引的目的在于提高查询效率，可以类比字典，如果要查“mysql”这个单词，我们肯定需要定位到m字母，然后从下往下找到y字母，再找到剩下的sql。<br>如果没有索引，那么你可能需要把所有单词看一遍才能找到你想要的，如果我想找到m开头的单词呢？或者ze开头的单词呢？是不是觉得如果没有索引，这个事情根本无法完成？<br>
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<a class="post-title-link" href="/2019/04/16/2019-3-18腾讯一面/" itemprop="url">2019.3.18腾讯暑期实习招聘提前批一面(挂)</a></h1>
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1分
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<h2 id="3-18晚上9点-人生第一次面试-岗位：后台开发"><a href="#3-18晚上9点-人生第一次面试-岗位：后台开发" class="headerlink" title="3.18晚上9点 人生第一次面试 岗位：后台开发"></a>3.18晚上9点 人生第一次面试 岗位：后台开发</h2>
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<h2 id="什么是插入排序"><a href="#什么是插入排序" class="headerlink" title="什么是插入排序"></a>什么是插入排序</h2><p>插入排序的基本思想就是把一个数插入到已经有序的数列中，形式就像平时打牌一样，要把一张牌插到已经有的牌中。<br>这里只是要把牌看成数组。
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