How does 3 thread communicate with each other

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The first way for threads to communicate is by using thread control methods. There are such three methods by which threads communicate for each other :

suspend ( ): A thread can suspend itself and wait till other thread resume it.
resume ( ): A thread can wake up other waiting thread (which is waiting using suspend() ) through its resume() method and then can run concurrently.
join ( ) :This method can be used for the caller thread to wait for the completion of called thread.

The secondway for threads to communicate is the use of three methods; wait(), notify(), and notifyAll(); these are defined in class Object of package java.lang. Actually these three methods provide an elegant inter-process communication mechanism to take care the deadlock situation in Java. As there is multi-threading in program, deadlock may occur when a thread holding the key to monitor is suspended or waiting for another thread's completion. If the other thread is waiting for needs to get into the same monitor, both threads will be waiting for ever. The uses of these three methods are briefed as below :

wait ( ):This method tells the calling thread to give up the monitor and make the calling thread wait until either a time out occurs or another thread call the same thread's notify() or notifyAll() method.
Notify ( ): This method wakes up the only one (first) waiting thread called wait() on the same object.
notifyAll( ): This method will wake up all the threads that have been called wait( ) on the same object

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