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

Difference between wait() and sleep()

• The fundamental difference is that wait() is from Object and sleep() is a static method of Thread.

• The major difference is that wait() releases the lock while sleep() doesn’t release any lock while waiting.

• wait() is used for inter-thread communication while sleep() is used to introduce a pause on execution, generally.

• wait() should be called from inside synchronise or else we get an IllegalMonitorStateException, while sleep() can be called anywhere.

• To start a thread again from wait(), you have to call notify() or notifyAll(). As for sleep(), the thread gets started after a specified time interval.

Similarities

• Both make the current thread go into the Not Runnable state.
• Both are native methods.