ConcurrentHashMap为什么不用segment

ConcurrentHashMap在JDK1.8版本中不再使用Segment，而是采用了一种新的实现方式，即将数据分散存储在多个节点上，每个节点上都有自己的锁。这样做的好处是，在多线程环境下，每个线程可以独立访问不同的节点，从而提高并发性能。而使用Segment的方式则需要对整个ConcurrentHashMap进行加锁，导致并发性能的下降。所以，在JDK1.8版本中，ConcurrentHashMap不再使用Segment，而是通过细粒度的锁来保证线程安全性。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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