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Merge pull request #418 from yidasanqian/master

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docs/java/collection/Java集合框架常见面试题.md
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@ -431,8 +431,8 @@ Output：
#### 2. Set #### 2. Set
- **HashSet（无序，唯一）:** 基于 HashMap 实现的，底层采用 HashMap 来保存元素 - **HashSet（无序，唯一）:** 基于 HashMap 实现的，底层采用 HashMap 来保存元素
- **LinkedHashSet：** LinkedHashSet 继承与 HashSet，并且其内部是通过 LinkedHashMap 来实现的。有点类似于我们之前说的LinkedHashMap 其内部是基于 Hashmap 实现一样，不过还是有一点点区别的。 - **LinkedHashSet：** LinkedHashSet 继承于 HashSet，并且其内部是通过 LinkedHashMap 来实现的。有点类似于我们之前说的LinkedHashMap 其内部是基于 HashMap 实现一样，不过还是有一点点区别的
- **TreeSet（有序，唯一）：** 红黑树(自平衡的排序二叉树。) - **TreeSet（有序，唯一）：** 红黑树(自平衡的排序二叉树)
### Map ### Map