CODEWITHSUNDEEP
javaswingtimer
Krikke93
Krikke93

Reputation: 101

Java Swing Timer Actionperformed doesn't get called

So, I've been messing around with the Swing Timer in Java, trying to make a little time counter. However, the actionperformed method doesn't seem to react whenever I make a timer and let it run. Here's my simplified UI class:

public class UI implements ActionListener {

    private int value = 0;
    Timer timer = new Timer(5,this);

    @Override
    public void actionPerformed(ActionEvent e) {
        value++;
        System.out.println(value);
    }

    public void start() {
        timer.start();
    }

}

And this is what my launcher looks like:

public class Launcher {

    public static void main(String[] args) {
        UI ui = new UI();
        ui.start();
    }

}

When I run the launcher, nothing happens. I do know he creates the UI and lets the timer start, but the timer doesn't seem to call the Actionperformed method. I'm wondering why. It should show the value +1 every interval of 5 (miliseconds?).

Thanks in advance!

Upvotes: 0

Views: 563

Answers (2)

Ishak Ayub
Ishak Ayub

Reputation: 7

hey i can help you out... you should do the following ;

firstly import the following ;

import java.awt.event.ActionEvent ;

import java.awt.event.ActionListener ;

import javax.swing.Timer ;

then initialize the timer at the end of the form like this ;
public static void main(String args[]) { 

     java.awt.EventQueue.invokeLater(new Runnable() {        
                public void run() {       
                new mainprogramme().setVisible(true);    
            }    


  });    

    }    
        private Timer timer ;

then after initializing the timer add a public class like following;

public class progress implements ActionListener {
    public void actionPerformed(ActionEvent evt){

    int n = 0 ;
    if (n<100){
        n++ ;
        System.out.println(n) ;
    }else{
        timer.stop() ;
    }
    }
    }

after you do this go to the j Frame>right click and select>Events>window>window Opened and type the following ;

private void formWindowOpened(java.awt.event.WindowEvent evt) {                                  
        timer = new Timer(100,new progress()) ;

and after you do all this take a button name it as anything and type the following in its void like following ;

  timer.start();

AND THAT'S IT CODE IT AND THEN REPLY ME...

Upvotes: 0

Renatols
Renatols

Reputation: 388

Your program is exiting before the timer Thread has a chance to start. You should give a little time before exiting the main Thread to allow the timer Thread to keep running. Thread.sleep(100) after ui.start()should solve.

Upvotes: 1

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