What is the difference between wait and sleep method?


  • Wait method is called from synchronized context only while sleep can be called without synchronized block.
  • Wait is called on object instance; while sleep is called on current thread.
  • Waiting thread can be awaken by calling notify/notifyAll whereas sleeping thread can't.
  • Wait is normally done on condition while sleep is just to put your thread on sleep.(Producer-Consumer)
  • Wait release lock on object while waiting whereas sleep doesn't release lock while waiting.

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