Difference between Wait and Sleep in Java

Java Object Oriented Programming Programming

Wait() - The thread releases ownership of this monitor and waits until another thread notifies threads waiting on this object's monitor to wake up either through a call to the notify() method or the notifyAll() method. The thread then waits until it can re-obtain ownership of the monitor and resumes execution.

Sleep() - This method causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds. The thread does not lose ownership of any monitors. It sends the current thread into the “Not Runnable” state for a specified amount of time.

Sr. No.	Key	Wait	Sleep
1	Class	Wait() method belongs to Object class	Sleep() method belongs to Thread class
2	Lock Release	Wait() releases the lock on an object	It does not release lock on an object
3	Calling context	Wait() can be called on object itself	Sleep() can be called on thread
4.	Wake-up condition	until call notify(), notifyAll() from object	until at least time expire or call interrupt
5	spurious wakeups	Program can get spurious wakeups	It will not get spurious wakeups.

Example of SynchronizedMap

synchronized(lockedObject){
   while(condition == true){
      lockedObject.wait() //releases lockedObject lock
   }
   Thread.sleep(100); //puts current thread on Sleep
}

Mahesh Parahar

Published on 18-Nov-2019 07:01:05

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