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ThreadLocal使用和源码分析 | 刘正阳
source link: https://liuzhengyang.github.io/2017/11/02/thread-local/?
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ThreadLocal介绍java.lang.ThreadLocal<T> 类是Java提供的用来保存线程本地变量的机制。说道线程本地变量很容易和和线程栈帧里的本地变量表联系起来。不过ThreadLocal的最普遍的用途是避免线程安全问题和框架代码实现模板模式。说道线程安全又要温习一下多线程知识了。线程安全就是多线程访问下程序的不变约束、后验条件等不被破坏程序保持正确性，原子性、可见性
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