How do I get JWindow to respond to the escape key

Question

Hi,
I am using JWindow to display an animation program and I want the user to press the "escape" key to end the program. But the program is not responding to any key events. Please help. Below is the code. Thanx.
public Class DrawPolygons extends JWindow implements KeyListener()
public void keyPressed(KeyEvent e)
if(e.getKeyCode() == e.VK_ESCAPE)
System.exit(0);
public void keyTyped(KeyEvent e){}
public void keyReleased(KeyEvent e){}

Answer 1

My program uses the "Random class" to obtain points to draw polygons. At the beginning of the program I use JOptionPane to obtain the seed to generate the random numbers.
If I press the "esc" key when the JOptionPane pops-up, the program ends but if I press the key when the polygons are being drawn, the program doesn't end. I am wondering, does it have to do with JWindow, or J2SDK_1.4.01 or could it be because I am using a timer that paints the shapes at a certain time interval? I don't understand. I will appreciate your suggestions, Takis. Thanx.
Bemmah