Resettable Java Timer

Question

I\'d like to have a java.utils.Timer with a resettable time in java.I need to set a once off event to occur in X seconds. If nothing happens in between the time the timer wa

Answer 1

If your Timer is only ever going to have one task to execute then I would suggest subclassing it:

import java.util.Timer;
import java.util.TimerTask;

public class ReschedulableTimer extends Timer
{
    private Runnable  task;
    private TimerTask timerTask;

    public void schedule(Runnable runnable, long delay)
    {
        task = runnable;
        timerTask = new TimerTask()
        {
            @Override
            public void run()
            {
                task.run();
            }
        };
        this.schedule(timerTask, delay);
    }

    public void reschedule(long delay)
    {
        timerTask.cancel();
        timerTask = new TimerTask()
        {
            @Override
            public void run()
            {
                task.run();
            }
        };
        this.schedule(timerTask, delay);
    }
}

You will need to work on the code to add checks for mis-use, but it should achieve what you want. The ScheduledThreadPoolExecutor does not seem to have built in support for rescheduling existing tasks either, but a similar approach should work there as well.