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fix markdown problems #25

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2 changes: 1 addition & 1 deletion markdown/7-LinkedHashSet and LinkedHashMap.md
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# 总体介绍

如果你已看过前面关于*HashSet*和*HashMap*，以及*TreeSet*和*TreeMap*的讲解，一定能够想到本文将要讲解的*LinkedHashSet*和*LinkedHashMap*其实也是一回事。*LinkedHashSet*和*LinkedHashMap*在Java里也有着相同的实现，前者仅仅是对后者做了一层包装，也就是说***LinkedHashSet*里面有一个*LinkedHashMap*（适配器模式）**。因此本文将重点分析*LinkedHashMap*。
如果你已看过前面关于*HashSet*和*HashMap*，以及*TreeSet*和*TreeMap*的讲解，一定能够想到本文将要讲解的*LinkedHashSet*和*LinkedHashMap*其实也是一回事。*LinkedHashSet*和*LinkedHashMap*在Java里也有着相同的实现，前者仅仅是对后者做了一层包装，也就是说 **LinkedHashSet** 里面有一个 **LinkedHashMap（适配器模式）** 。因此本文将重点分析*LinkedHashMap*。

*LinkedHashMap*实现了*Map*接口，即允许放入`key`为`null`的元素，也允许插入`value`为`null`的元素。从名字上可以看出该容器是*linked list*和*HashMap*的混合体，也就是说它同时满足*HashMap*和*linked list*的某些特性。**可将*LinkedHashMap*看作采用*linked list*增强的*HashMap*。**

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