Sleeping and Waking
As shown in Listings 8.1 and 8.2, a thread can enter the waiting state by invoking its sleep() method. The sleep() method, like the yield() method, is a static method of the Thread class. It takes a millisecond time value and an optional nanosecond time value as arguments. When a thread invokes its sleep() method, it enters the waiting state. It returns to the ready state after the specified time has expired.
It is possible for another thread to awaken a sleeping thread by invoking the sleeping thread's interrupt() method. The sleeping thread then enters the ready state. When it reenters the running state, execution continues with the thread's InterruptedException handler.
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