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Merge pull request #1171 from zchazc/patch-1

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Update Java集合框架常见面试题.md
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@ -516,7 +516,7 @@ static int hash(int h) {
### 1.4.8. HashMap 有哪几种常见的遍历方式?
[HashMap 的 7 种遍历方式与性能分析！](https://mp.weixin.qq.com/s/Zz6mofCtmYpABDL1ap04ow)
[HashMap 的 7 种遍历方式与性能分析！](https://mp.weixin.qq.com/s/zQBN3UvJDhRTKP6SzcZFKw)
### 1.4.9. ConcurrentHashMap 和 Hashtable 的区别
@ -620,4 +620,4 @@ synchronizedSet(Set<T> s) //返回指定 set 支持的同步（线程安全的
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