Inter-thread communication in Java

Carvia Tech | August 05, 2019 | 1 min read | 27 views


Inter-thread communication is all about allowing threads to communicate with each other over a shared mutable object.

Java’s Object class provides 3 final methods which allows inter-thread communication:

  • wait()

  • notify()

  • notifyAll()

All these methods must be used within a synchronized block only.

wait()

It instructs the calling thread to give up the lock and go to sleep until some other thread enters the same monitor and calls notify()

notify()

It wakes up a single thread that was in waiting state (because that thread called wait()) on the same object. Calling notify() does not actually give up a lock on a resource.

notifyAll()

It functionality is quite similar to notify() except that it wakes up all the threads that were on waiting state on the same object.


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