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Thread: Timer wont stop...

  1. #1
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    Default Timer wont stop...

    Hi,
    I made a timer, and it wont stop... I wanted it to only initiate the action once, so i setReapets(false) but it still just keeps on going. Even when i but timer.stop() it keeps on going... How do i fix this?

    import javax.swing.*;
    import java.awt.*;
    import javax.swing.Timer;
    import java.awt.event.ActionEvent;
     
    public class TimerTest
    {
        public static void main(String[] args) {
            JFrame frame = new JFrame ("Timer Test");
            frame.setSize (400,400);
            JPanel panel = new JPanel();
            // make new action
            Action action = new AbstractAction() {
                public void actionPerformed (ActionEvent e){
                    System.out.println ("hello");
        }
    };
    Timer timer;
    timer = new Timer(5000, action);
    timer.setRepeats(false);
    System.out.println ("The timer has started");
    timer.start();
    timer.stop();
    }
    }


  2. #2

    Default Re: Timer wont stop...

    I would use java.util.Timer.

    It has scheduling methods for single use and repeated use.

    Single use:
    Timer timer = new Timer();
    		timer.schedule(new TimerTask()
    		{
     
    			@Override
    			public void run()
    			{
    				//put code here
    			}
    		}, longDelay);

    Repeat use:
    Timer timer = new Timer();
    		timer.scheduleAtFixedRate(new TimerTask()
    		{
     
    			@Override
    			public void run()
    			{
    				//put code here
    			}
    		}, longDelay, longPeriodBeforeRepeat);
    Kenneth Walter
    Software Developer
    http://kennywalter.com

  3. #3
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Timer wont stop...

    The Swing Timer works fine. I ran that code, and it runs exactly how I'd expect- it prints "hello" once. Are you sure you're running this code? Try deleting any .class files, recompiling, and trying again.
    Last edited by KevinWorkman; October 6th, 2011 at 10:30 AM.
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    Default Re: Timer wont stop...

    Hey, I got it to work. I dont know what was wrong with it before, but when i switched computers it started working fine. However, i have moved to my home computer now instead of my school one and i use eclipse. Eclipse is giving me an error on AbstractAction saying that "The serializable class does not declare a static final serialVersionUID feild of type long". The code compiles and runs, but the action isnt working. So the timer starts (i think) but the action doesnt work...
    Any advice?

  5. #5
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    Default Re: Timer wont stop...

    That's not an error, it's just a warning, and it's pretty self-explanatory. It should not affect runtime behavior at all.
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    Default Re: Timer wont stop...

    Hey, i downloaded BlueJ and my code worked in that, so there must be something wrong with my eclipse... Ill let you know if i figure it out...

  7. #7
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    Default Re: Timer wont stop...

    Quote Originally Posted by pottsiex5 View Post
    Hey, i downloaded BlueJ and my code worked in that, so there must be something wrong with my eclipse... Ill let you know if i figure it out...
    I highly doubt it. You were probably just using an old .class file. Simply cleaning the project in eclipse would have probably done the trick, but you never followed my advice to delete the .class files and recompile.
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    Default Re: Timer wont stop...

    I did take your advice and recompile it. Though i did find out that if i reduce the speed to anywhere below 1062 milliseconds it works... I also noticed in the title of the console it says terminated<TimerTest.java> before the 5 seconds are up, so it is ending the file before the timer has a chance to output the "hello"...

  9. #9
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    Default Re: Timer wont stop...

    Quote Originally Posted by pottsiex5 View Post
    I did take your advice and recompile it. Though i did find out that if i reduce the speed to anywhere below 1062 milliseconds it works... I also noticed in the title of the console it says terminated<TimerTest.java> before the 5 seconds are up, so it is ending the file before the timer has a chance to output the "hello"...
    Yup, that would make sense. Try popping up a JFrame to keep the program going.
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