Question

In fact I would execute a specific task( a set of instructions) for a determined period.

For example : I want my program to execute the task for 5 minutes, if it gets the right result it stops , else it will continue executing normal task for the 5 minutes and in the end it tells me.

How can I implement this in Java.

Answer 1

You could something like the following:

import java.util.concurrent.* ;

ExecutorService svc = Executors.newFixedThreadPool( 1 ) ;
svc.submit( new Runnable() {
  public void run() {
    // Do long running task
  }
} ) ;
svc.shutdown() ;
svc.awaitTermination( 300, TimeUnit.SECONDS ) ;

Javadocs for ExecutorService are here

[edit]

I should probably note however that depending on what your long running task is doing, it may not be possible to force it to stop running

[edit2] the submit method returns a Future object, which you can then call get on with a timeout. This get call will block until a result is ready, or if the timeout is reached throw a TimeoutException. In this way, you can get a result back from your long running task if that is what you wanted