Thread.sleep() implementation

Question

Today I had an interview on which I asked candidate quite usual and basic question about the difference between Thread.sleep() and Object.wait(). I exp

Answer 1

When a thread is called the sleep method, the thread will be added into a sleep queue. If the compute clock frequency is 100HZ, that means every 10ms the current running process will be interrupted. After reserve the current context of the thread, then it will decrease the value (-10ms) for each thread. When it comes to zero, the thread will move to "waiting for CPU" queue. When time slice comes to this thread, it will be running again. Also because this which not immediately become running, so the time actually sleeps is larger than the value it set.