Help with windowClosing event

Question

I'm getting an error and I'm not sure how to fix it. When I compile, I get this:
C:\Program Files\Xinox Software\JCreator LE\MyProjects\OctagonDrag\OctagonDrag.java:54: OctagonDrag.CloseWindow is not abstract and does not override abstract method windowOpened(java.awt.event.WindowEvent) in java.awt.event.WindowListener
     class CloseWindow implements WindowListener {
Here's my code. If anyone can help, I'd be grateful.
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
public class OctagonDrag extends Frame
     implements MouseMotionListener {
     private int [] x = {150,175,175,150,100,75,75,100};
     private int [] y = {150,175,175,150,100,75,75,100};
     private Polygon p = new Polygon(x,y,8);
     private int oldx; //Saves previous Polygon position
     private int oldy;
     private Label displayCountLabel = new Label("Number of valid mouse drags");
     private TextField displayCount = new TextField(5);
     public void init() {
          addMouseListener(new MousePressListener());
          addMouseMotionListener(this);
          Panel bar = new Panel();
          bar.add(displayCountLabel);
          bar.add(displayCount);
          add(bar,"North");
     public void paint(Graphics g) {
          g.fillPolygon(p);
     public void mouseMoved(MouseEvent event) { }
     public void mouseDragged(MouseEvent event) {
          int x = event.getX();
          int y = event.getY();
          if (p.contains(x,y)) {
               p.translate(x - oldx, y - oldy);
               oldx = x;
               oldy = y;
               repaint();
     class MousePressListener extends MouseAdapter {
          public void mousePressed(MouseEvent event) {
               int x = event.getX();
               int y = event.getY();
               if (p.contains(x,y)) {
                    oldx = x;
                    oldy = y;
     class CloseWindow implements WindowListener {
          public void windowClosing(WindowEvent event) {
               System.exit(0);
     public static void main(String [] args) {
}

Answer 1

Instead of implementing WindowListener, you can extend WindowAdapter
so I need to implement method you need and don't have to implement all other method
in the WindowListener
here is the sample of extending WindowAdapter
good luck
background:
WindowListener interface has 7 methods, so if you implements WIndoListener you have to implement
all 7 methods otherwise, the compiler will complains
class CloseWindow extends WindowAdapter
          public void windowClosing(WindowEvent event)
               System.exit(0);
     }