How to make a thread sleep for specific amount of time in java?

Question

I have a scenario where i want a thread to sleep for specific amount of time.

Code:

    public void run(){
        try{
            //do something
               


        

Answer 1

1. using Sleep in my experience is usually to compensate for bad timing somewhere else in the program, reconsider!

2. try this:

   public void run(){
           try{
               //do something
               long before = System.currentTimeMillis();
               Thread.sleep(3000);
               //do something after waking up
           }catch(InterruptedException e){
               long diff = System.currentTimeMillis()-before;
               //this is approximation! exception handlers take time too....
               if(diff < 3000)
                   //do something else, maybe go back to sleep.
                   // interrupted exception hit before the sleep time is completed.so how do i make my thread sleep for exactly 3 seconds?
           }
   }
   

3. if you do not interrupt the sleep yourself, why would this thread be awoken ? is seems that you are doing something very wrong...