Answer / tek

All the three methods are called in synchronized block or
method.

wait(): Thread calling wait method will go to the waiting
state and it will loose its monitor. It will execute only
if it is notified by the other threads.

notify(): To notify thread which is waiting for the concern
object.

notifyAll(): To notify all the threads which are in waiting
state.

Answer / sumitpalsingh

The purpose of using the wait(),notify() and notifyAll() methd is used for interThread communication.
for Example :-There is a n situation communication between Producer and Consumer...Producer wll produce an item and go to waiting state by using wait() method.and it will notify to the consumer for to consume an item. After conume an Item Consumer will come into waiting state by using wait() method ..and give the notification to Produer by using notify() method to produce an item.But all these methods are called only in synhronized() method or synchronized block.

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