大多数程序员都知道，synchronized关键字强制实施一个互斥锁(互相排斥)，这个互斥锁防止每次有多个线程进入一个给定监控器所保护的同步语句块。

Most programmers know that the synchronized keyword enforces a mutex (mutual exclusion) that prevents more than one thread at a time from entering a synchronized block protected by a given monitor.

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