An object's intrinsic lock and its intrinsic condition queue are related: in order to call any of the condition queue methods on object X, you must hold the lock on X .
一个对象的固有锁和它的固有条件队列是相关的，为了调用对象X内条件队列的方法，你必须获得对象X的锁。 这是因为等待状态条件的机制和保证状态连续性的机制是紧密的结合在一起的。
Instead of throwing an exception when the queue is empty, the reader thread now blocks itself on the condition variable.
当队列是空的时候，读线程现在并不抛出异常，而是在条件变量上阻塞自身。
The first thing of note in Listing 13 and Listing 14 is that there are two condition variables instead of the one that the blocking queue had.
对于清单13和清单14，要注意的第一点是，这个阻塞队列有两个条件变量而不是一个。
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