How can I reset a timer in java?

Question

private void btnGuess1ActionPerformed(java.awt.event.ActionEvent evt) {    
    Timer timer = new Timer();
    TimerTask task = new TimerTask(){
        private int i = 0;
        public void run(){
            if (i <= 20){
                lblTimer.setText("" + i++);
            }
        }
    };
    timer.cancel();
    timer.purge();
    timer = new Timer();
    timer.schedule(task, 1000);

This is what I have so far. When I activate this piece of code using a button, the timer never resets. How can I fix this? There are no error message either.

Any help is appreciated thanks in advance.

When i click a button the timer is suppose to go back to 0 and then start counting to 20 again. — Jeffrey Cao, Aug 20 '15 at 07:15
so you will have to bind and event onclick on the button, and in the code you need to have the reset code — Danyal Sandeelo, Aug 20 '15 at 07:16
are you looking at this kind of solution?http://stackoverflow.com/questions/32001/resettable-java-timer — Ravindra babu, Aug 20 '15 at 07:18
@DanyalSandeelo Edited code. I looked on line and people said to reset it, you cancel and purge it then create a new timer and use timer.schedule(task, 1000); to restart it but it's not reseting :/ — Jeffrey Cao, Aug 20 '15 at 07:18
Yeah I looked at that question but when i tried to use timer.stop(); it gave me a syntax error saying couldn't find symbol. — Jeffrey Cao, Aug 20 '15 at 07:19
declar Timer timer as GLOBAL, and keep assigning new object in the action performed — Danyal Sandeelo, Aug 20 '15 at 07:24
@DanyalSandeelo what do you mean by keep assigning new object in the action performed? — Jeffrey Cao, Aug 20 '15 at 07:32

Dakshinamurthy Karra · Accepted Answer · 2015-08-20T07:54:42.257

2

Make timer a member of your class and create it in the constructor. You should be cancelling the timer before scheduling your new task. Something like this:

 private void btnGuess1ActionPerformed(java.awt.event.ActionEvent evt) {    
    timer.cancel();
    TimerTask task = new TimerTask(){
       private int i = 0;
       public void run(){
       if (i <= 20){
         lblTimer.setText("" + i++);
      }
    }
};
timer = new Timer();
timer.scheduleAtFixedRate(task, 0, 1000);

edited Aug 20 '15 at 07:54

answered Aug 20 '15 at 07:26

Dakshinamurthy Karra

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I get an error saying Timer already cancelled when I do this though – Jeffrey Cao Aug 20 '15 at 07:30
Create a new timer object. See the modified code. and check whether `timer == null` before cancel and remove timer creation from constructor. – Dakshinamurthy Karra Aug 20 '15 at 07:38
Now the timer is stuck at 0 – Jeffrey Cao Aug 20 '15 at 07:44
You should be using `scheduleAtFixedRate` rather than `schedule`. Look at the java doc. – Dakshinamurthy Karra Aug 20 '15 at 07:55
Oh okay its working again, just now it seems like the previous timers arn't stopping. So now there are 2 timers going so the label could have 1 timer on and it'd be setting the text and then the second timer is also setting text to it at the same time. – Jeffrey Cao Aug 20 '15 at 08:01
Ensure you are calling `cancel` on the previous timer object. – Dakshinamurthy Karra Aug 20 '15 at 08:06
Okay i double checked and now it works :D Thanks so much sir. – Jeffrey Cao Aug 20 '15 at 08:19

How can I reset a timer in java?

1 Answers1