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CyC2018 2018-04-02 18:20:24 +08:00
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notes/Java 容器.md
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@ -737,13 +737,8 @@ ConcurrentHashMap 的高并发性主要来自于三个方面：
[ConcurrentHashMap.java](https://github.com/CyC2018/JDK-Source-Code/blob/master/src/ConcurrentHashMap.java)
<div align="center"> <img src="../pics//7779232-1e8ed39548081a1f.png"/> </div><br>
JDK 1.7 分段锁机制来实现并发更新操作，核心类为 Segment，它继承自重入锁 ReentrantLock。
<div align="center"> <img src="../pics//7779232-96822582feb08651.png"/> </div><br>
JDK 1.8 的实现不是用了 Segment，Segment 属于重入锁 ReentrantLock。而是使用了内置锁 synchronized，主要是出于以下考虑：
1. synchronized 的锁粒度更低；