Java - Why wait, notify and notifyAll is defined in Object Class and not on Thread class
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Java中的锁是定义在对象(object)上的, wait, notify是与锁相关的操作,因此方法应该定义在对象类里。
在Java中, 为了进入critical section of code ,线程只需要获取锁和等待锁, 它们不需要知道哪个线程在hold锁, 只需要知道锁正在被hold, 它们只需要等待锁释放,而不需要ask hold锁的线程来释放锁。
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