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

One potential big difference between sleep/interrupt and wait/notify is that

• calling interrupt() during sleep() always throws an exception (e.g. InterruptedException), whereas
• calling notify() during wait() does not.

Generating an exception when not needed is inefficient. If you have threads communicating with each other at a high rate, then it would be generating a lot of exceptions if you were calling interrupt all the time, which is a total waste of CPU.