How to create a Timer that goes backwards

Question

I'm making a Software by Java (& Netbeans IDE) and one of the features I would like to add is a timer that can be given a certain time (1 hour) and then let it run backwards till it goes 00:00:00 where it will do a certain action.

I tried to do something with my knowledge of adding a clock to the program but it didn't work. Please help

score 4 · Answer 1 · edited Oct 06 '13 at 04:28

4

You could try this:

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

public class CountDown {    
     Timer timer;
     public CountDown() {
        timer = new Timer();
        timer.schedule(new DisplayCountdown(), 0, 1000);
    }
    class DisplayCountdown extends TimerTask {

          int seconds = 60;
          public void run() {
               if (seconds > 0) {
                  System.out.println(seconds + " seconds remaining");
                  seconds--;
               } else {

                  System.out.println("Countdown finished");
                  System.exit(0);
              }    
        }
   }     
   public static void main(String args[]) {

      System.out.println("Countdown Beginning");    
      new CountDown();    
   }    
}

Read more: http://www.ehow.com/how_8675868_countdown-tutorial-java.html#ixzz2guYw8c99

edited Oct 06 '13 at 04:28

Prabhakaran Ramaswamy

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answered Oct 06 '13 at 04:06

m.lanser

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Thank you so much. Quick question: How do I turn seconds to minutes and make show remaining minutes and seconds??? – Hashan Wijetunga Oct 06 '13 at 04:35
I tried that but it doesn't continuously run. It simply prints the value I gave for seconds converted to hh:mm:ss instead of continuously going according to seconds. – Hashan Wijetunga Oct 06 '13 at 05:09
Sorry I took time to reply. I had to do every possibility I know using those codes. – Hashan Wijetunga Oct 06 '13 at 05:10

score 0 · Answer 2 · answered Oct 06 '13 at 04:04

0

I would start a new Thread where it waits 100 milliseconds (Thread.sleep(1000)) and then subtract that from hours * 60 /or minutes/ * 60 /* or seconds */ * 1000. If the result == 0 then you've hit that time.

answered Oct 06 '13 at 04:04

APerson

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score 0 · Answer 3 · edited May 23 '17 at 12:27

0

Do you need to continuously display the countdown? If so, check this out: Java swing timer not decrementing the right way and not starting at the correct hour

If not, just use javax.Swing.Timer and set it for non-repeat and 3600 * 1000 millis

Edit: if you are not using Swing, then perhaps java.util.Timer

edited May 23 '17 at 12:27

Community

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answered Oct 06 '13 at 04:16

Irina Rapoport

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OP didn't say if he is using `swing` – nachokk Oct 06 '13 at 04:17

How to create a Timer that goes backwards

3 Answers3