Question

Here is my code

try{

  System.out.println("Before");
  thread.sleep(10000);//sleep for 10000 ms
  System.out.println("After");

}
catch(ItrerruptedException ie){
//If this thread was intrrupted by nother thread 
}

I just want to know whether the thread will sleep for exaclty 10 seconds and then print After or there is some delay?

Answer 1

From the javadocs: Causes the currently executing thread to sleep (temporarily cease execution) for the specified number of milliseconds, subject to the precision and accuracy of system timers and schedulers. Which means it will sleep for at least 10 seconds. It may sleep longer if the scheduler decides to not let it run after the 10 seconds is over.
Which may happen if more concurrent threads are in the runnable pool at the same time.