notifyall

The root Object class includes some special methods for communicating across threads& wait(), notify(), and notifyAll().

根类Object包含某些特殊的方法，用来在线程的wait（）、notify（）和notifyAll（）之间进行通信。

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In essence, wait() and notify()/ notifyAll() act as a simple signaling mechanism, allowing the Drop to coordinate between the Producer and the Consumer threads, one take to each put.

从本质上说，wait（）和notify（）/notifyAll（）允许一种简单的信令机制，它允许Drop在Producer和Consumer线程之间进行协调，每个put都有相应的take。

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Careful: replacing the notifyAll() with notify() solves the problem in this scenario but will fail on others!)

注意：用notify（）取代notifyAll（）能解决此情形中的问题，但是在其他情形中将会失败！

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The wait() method tells the current thread to go into an inactive state and wait for another thread to call notifyAll() on that object.

wait（）方法将通知当前线程进入非活动状态，并等待另一个线对该对象调用notifyAll（）。

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When an external process calls the Bucket's ( also synchronized) flush() method, a notifyAll() is sent, thereby waking up all blocking processes.

当外部进程调用Bucket的（也是同步的）flush（）方法时，就发送一个notifyAll（），唤醒所有受阻塞的线程。

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