Animation not stopping

[s3a]

Someone told me that one (or more) redraw(s) is/are triggered even after I do timer.stop(). I just cannot see how and would really appreciate it if someone could bring it out in an obvious way.

Anyways, here is the code:

import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.Timer;
 
 
public class Bounds extends JPanel
{
    int x = 50, y = 50, width = 20, height = 20;
    Timer timer;
 
    public Bounds()
    {
        JFrame frame = new JFrame();
        frame.setVisible(true);
        frame.setSize(800,600);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(this);
 
        ActionListener listener = new graphicsListener();
 
        timer = new Timer(200, listener);
        timer.start();
    }
 
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g); // so that the background gets refreshed
        g.drawRect(x, y, width, height);
 
        System.out.println("Panel width: " + getWidth() + " Panel height: " + getHeight());
        System.out.println("x+width = " + (x+width));
        System.out.println("y+height = " + (y+height));
        if(x+width >= getWidth() || y+height >= getHeight())
        {
            System.out.println("Out of bounds!");
            JOptionPane.showMessageDialog(null, "Out of bounds!");
            timer.stop(); // Why isn't this having an effect?
        }
 
        x+=10;
        y+=10;
        width+=20;
        height+=20;
    }
 
    public class graphicsListener implements ActionListener
    {
        public void actionPerformed(ActionEvent event)
        {
            repaint();
        }
    }
 
    public static void main(String[] args)
    {
        new Bounds();
    }
}

Any help would be greatly appreciated!
Thanks in advance!

[keang]

javax.swing.Timer uses it's own thread to to perform the waiting for and triggering of events but the action event handlers execute on another thread the event-dispatching thread. This makes it easy to interact with the GUI as all GUI operations have to be done on the event-dispatching thread but it does mean there is a disconnection between the events been triggered and being handled.

Therefore, if your timer triggers events quicker than the event-dispatching thread can process them they will be queued in the event-dispatch queue. When you stop the timer from running no more events will be added to the event-dispatch queue but any events still in the queue will be processed.