hi friend,

Inter thread communication is a process of communication between two threads. In this process, a thread outside the critical section is tried to run inside the critical section where a thread is already running. It is possible only when a thread inside the critical section is paused or its task is ended or there is no thread running inside the critical region. Then the question is how a thread outside the critical region can know that it can execute inside the critical section. For this the threads sends a signal using which they can know whether they are allowed to be executed inside the critical section or not. This can be possible by implementing some methods these methods are:

• wait()
• notify()
• notifyAll()

For detail tutorial please go through the following links :

http://www.roseindia.net/java/thread/InterthreadCommunication.shtml

http://www.devmanuals.com/tutorials/java/corejava/InterthreadCommunication.html