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1、锁的策略加锁过程中，处理冲突的过程中，涉及到的一些不同的处理方式，就叫锁的策略。 1.1、乐观锁和悲观锁乐观锁在加锁之前，预估当前出现锁冲突的概率不大，因此在进行加锁的时候就不会做太多的工作。由于加锁过程中做的事情比较少，加锁的速度可能就更快，但是更容易引入一些其他的问题（消耗更多cpu...

Java 最常见的面试题：多线程锁的升级原理是什么？

在Java中，锁共有4种状态，级别从低到高依次为：无状态锁，偏向锁，轻量级锁和重量级锁状态，这几个状态会随着竞争情况逐渐升级。锁可以升级但不能降级。锁升级的图示过程：

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