import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class click extends Applet implements MouseListener {
    private int x=40,y=40;
    private int r=10;

    public void init() { 
      addMouseListener(this);  
    }

    public void paint(Graphics g) {
        g.setColor(Color.white); g.fillRect(0,0,getSize().width,getSize().height);
        g.setColor(Color.red);   g.fillOval(x-r,y-r,r*2,r*2); 
    }

    public void mousePressed(MouseEvent event) { x=event.getX(); y=event.getY(); repaint(); }

    public void mouseClicked(MouseEvent event) {}
    public void mouseReleased(MouseEvent event) {}
    public void mouseEntered(MouseEvent event) {}
    public void mouseExited(MouseEvent event) {}
}