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MD/HashMap.md
@@ -39,4 +39,6 @@ get 和 put 类似,也是将传入的 Key 计算出 index ,如果该位置
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如果是红黑树,时间复杂度就是 `O(logn)` 。
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+大大提高了查询效率。
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多线程场景下推荐使用 [ConcurrentHashMap](https://github.com/crossoverJie/Java-Interview/blob/master/MD/ConcurrentHashMap.md)。
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