CODEWITHSUNDEEP
javatimertimertask
Alk
Alk

Reputation: 5567

Java - Reusing Timer Object after calling cancel

I have an application in Java where I need to schedule a TimerTaskwhich will be executed after 500ms , however if a certain event occurs, I must reset the timer for this task (so that we must wait another 500ms for it to execute). I have a timer declared for the whole class. I use the following code:

public static void main(String[] args) {

    if (curr_pck == my_pck) {
                timer.cancel();
                timer.purge();
                timer = new Timer();
                timer.schedule(new TimerTask() {
                    @Override
                    public void run() {
                        myTask();
                    }
                }, 500);
            }

}  


public static void myTask() {

    timer.cancel();
    timer.purge();

    timer = new Timer();

    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            myTask();
        }
    }, 500);

  //EXECUTE CODE WHICH ISN'T RELEVANT TO THE QUESTION

}

I know that if I use timer.cancel() I can't reuse the timer object, however I thought reinitialising it in the line timer = new Timer() should solve this issue. Is there any way around this?

EXCEPTION on line timer.schedule(new TimerTask() { inside myTask() function:

java.lang.IllegalStateException: Timer already cancelled.

Upvotes: 3

Views: 1008

Answers (2)

Hoijf
Hoijf

Reputation: 31

Create a class Timerr with the appropriate methods. Then access it as if it were a normal timer.

public class Timerr
{
    private Timer timer;

    public Timerr()
    {
        timer = new Timer();
        start();
    }

    public void start()
    {
        timer.schedule(new TimerTask()
        {
            @Override
            public void run()
            {
                System.out.println("hi");
            }
        }, 500);
    }

    public void reset()
    {
        timer.cancel();
        timer.purge();
        start();
    }
}

Create instance

private Timerr timer = new Timerr();

Do your reset

if(condition)
{
    timerr.reset();
}

Upvotes: -1

Seymore
Seymore

Reputation: 30

You may want to check out Java's Swing timer. It works somewhat differently and you may have to write an internal class or an actionlistener, but the Swing timer includes .stop() and .restart(), which seem like they would work better in your application.

Upvotes: -2

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