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Update 面试必备之乐观锁与悲观锁.md

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面试必备/面试必备之乐观锁与悲观锁.md
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@ -44,6 +44,9 @@
当且仅当 V 的值等于 A时，CAS通过原子方式用新值B来更新V的值，否则不会执行任何操作（比较和替换是一个原子操作）。一般情况下是一个**自旋操作**，即**不断的重试**。
关于自旋锁，大家可以看一下这篇文章，非常不错：[《
面试必备之深入理解自旋锁》](https://blog.csdn.net/qq_34337272/article/details/81252853)
### 乐观锁的缺点
> ABA 问题是乐观锁一个常见的问题
@ -75,10 +78,6 @@ CAS 只对单个共享变量有效，当操作涉及跨多个共享变量时 CAS
> 如果你觉得我的文章对你有帮助话，欢迎关注我的微信公众号:"**Java面试通关手册**"（一个有温度的微信公众号，无广告，单纯技术分享，期待与你共同进步~~~坚持原创，分享美文，分享各种Java学习资源。)
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