Java threadlocal
时间: 2023-08-09 09:08:07 浏览: 127
Java中的ThreadLocal是一个线程局部变量,它提供了一种在多线程环境下保持变量的独立副本的机制。每个线程都有自己的ThreadLocal变量副本,线程之间互不干扰。\[1\]通过ThreadLocal可以在父线程中设置值,在子线程中获取不到该值。这是因为ThreadLocal中的变量是存储在threadLocals中的,每个线程都有自己的threadLocals,所以无法共享。\[1\]可以通过在子线程中重新设置ThreadLocal变量的值来解决这个问题。\[2\]需要注意的是,在使用线程池时,由于线程的复用,ThreadLocal对象可能未被清理,导致在ThreadLocalMap中进行值操作时被覆盖或取到旧值。\[3\]因此,在使用线程池中的线程调用ThreadLocal时需要特别注意。
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