Animation not stopping

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:

Code:

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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!

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.