Difference between wait() and sleep()

Question

What is the difference between a wait() and sleep() in Threads?

Is my understanding that a wait()-ing Thread is still in runni

Answer 1

From this post : http://javaconceptoftheday.com/difference-between-wait-and-sleep-methods-in-java/

wait() Method.

1) The thread which calls wait() method releases the lock it holds.

2) The thread regains the lock after other threads call either notify() or notifyAll() methods on the same lock.

3) wait() method must be called within the synchronized block.

4) wait() method is always called on objects.

5) Waiting threads can be woken up by other threads by calling notify() or notifyAll() methods.

6) To call wait() method, thread must have object lock.

sleep() Method

1) The thread which calls sleep() method doesn’t release the lock it holds.

2) sleep() method can be called within or outside the synchronized block.

3) sleep() method is always called on threads.

4) Sleeping threads can not be woken up by other threads. If done so, thread will throw InterruptedException.

5) To call sleep() method, thread need not to have object lock.