Making a program run for 5 minutes

Question

So I wanted to try out something for a bit with the Timer and TimerTask classes.

I was able to get a line of code to execute after 30 seconds elapsed. What I\'ve been t

Answer 1

Java has provided a rich set of APIs in java.util.concurrent package to achieve such tasks. One of these APIs is ScheduledExecutorService. For example consider the code given below: This code will execute the Runnable task after every 30 seconds for upto 5 minutes:

import java.util.concurrent.*;

class Scheduler 
{
    private final ScheduledExecutorService service;
    private final long period = 30;//Repeat interval
    public Scheduler()
    {
        service = Executors.newScheduledThreadPool(1);
    }
    public void startScheduler(Runnable runnable)
    {
        final ScheduledFuture handler = service.scheduleAtFixedRate(runnable,0,period,TimeUnit.SECONDS);//Will cause the task to execute after every 30 seconds
        Runnable cancel = new Runnable()
        {
            @Override
            public void run()
            {
                handler.cancel(true);
                System.out.println("5 minutes over...Task is cancelled : "+handler.isCancelled());
            }
        };
        service.schedule(cancel,5,TimeUnit.MINUTES);//Cancels the task after 5 minutes
    }
    public static void main(String st[])
    {
        Runnable task = new Runnable()//The task that you want to run
        {
            @Override
            public void run()
            {
                System.out.println("I am a task");
            }
        };
        Scheduler sc = new Scheduler();
        sc.startScheduler(task);
    }
}