If a thread must wait for the state of an object to change, it should call wait() inside a synchronized method.
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void wait()
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void wait( int timeout )
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These methods cause the thread to wait until notified or until the timeout period expires, respectively.
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The timeout argument is optional. If missing or zero, the thread waits until either notify() or notifyAll() is called. (See next foil.)
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wait() is called by the thread owning the lock associated with a particular object; wait() releases this lock (atomically, i.e., safely)
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