program in java - windowlistner & draw line with awt

import java.awt.*;
import java.awt.event.*;

class a3 extends Frame
{
    public static void main(String args[])
    {
        a3 d=new a3();

        d.setTitle("Draw");
        d.setSize(500,500);
        d.setVisible(true);

        myclass m=new myclass();
        d.addWindowListener(m);
    }
    public void paint(Graphics g)
    {
        g.drawLine(200,200,100,100);
    }
}
class myclass implements WindowListener
{
        public void windowClosing(WindowEvent we)
        {
            System.exit(0);
        }
        public void windowClosed(WindowEvent we)
        {
        }
        public void windowIconified(WindowEvent we)
        {
        }
        public void windowDeiconified(WindowEvent we)
        {
        }
        public void windowActivated(WindowEvent we)
        {
        }
        public void windowDeactivated(WindowEvent we)
        {
        }
        public void windowOpened(WindowEvent we)
        {
        }
}