What is the difference between notify() and notifyAll() methods in Java ?

Difference between notify() and notifyAll() methods in Java ?

In Java there are two methods i.e notify() and notifyAll() which are used to wake up threads from the waiting state. These methods along with wait() method are used to establish a communication between the threads.

A thread goes in a WAITING state by calling wait() method, now the waiting thread will always be in waiting state until any other thread call notify() and notifyAll() method.

notify() :

When a thread calls notify() method, only one thread will be notified which is waiting for the lock.notify() does not guarantee that it will starts the first waiting thread ,so Thread-scheduler pick a random thread from a pool of waiting thread ,here Thread-scheduler guarantee that it will pick only one thread .

notifyAll() :

When a thread calls notifyAll() method, all threads are notified which are in waiting for the lock.And all threads will move from the WAITING state to BLOCKED state ,and threads will get a lock on the basis of their priority. And the thread which get a lock will move from BLOCKED state to RUNNING state.

      

Blog Author - Pushkar Khosla,
Software Developer by Profession with 3.0 Yrs of Experience , through this blog i'am sharing my industrial Java Knowledge to entire world. For any question or query any one can comment below or mail me at pushkar.itsitm52@gmail.com.

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