| Wait() Method | Sleep() Method |
|---|---|
| wait() Method of thread class goes in waiting state and it won’t come back automatically until we call the notify() or notifyAll(). |
sleep() is a method which is used to pause the process for few seconds or the time we want too. |
| It is called on Object. | It is called on Threads. |
| It is an instant member of java.lang.Object class. | It is a static member of java.lang.Thread class. |
| wait() releases the lock or monitor. | sleep() doesn’t releases the lock or monitor while waiting. |
| wait() is used for inter-thread communication. | sleep() is used to introduce pause on execution, generally. |
| It must be called within the synchronized blocks. | It may be called from within or outside the synchronized block. |
wait() Example synchronized(LOCK)
{
LOCK.wait(); // LOCK is not held
}
|
sleep() Example synchronized(LOCK)
{
Thread.sleep(1000); // LOCK is held
}
|
