Wait and notify

There are five methods implemented in the class Object that can be used to get further synchronization functionality: wait with three different timeout argument signature, notify, and notifyAll. To call wait, the calling thread should have the lock of the Object on which wait is invoked. It means that you can only invoke wait from inside a synchronized block, and when it is called, the thread gets BLOCKED and releases the lock. When another thread calls notify all on the same Object, the thread gets into the RUNNABLE state. It cannot continue execution immediately as it cannot get the lock on the object. The lock is held at that moment by the thread that just called notifyAll. However, sometime after the other thread releases, the lock gets out of the synchronized block, and the waiting thread continues the execution.

If there are more threads waiting on an object, all of them get out of the BLOCKED state. The notify method wakes only one of the waiting threads. There is no...