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

public class CircleDrawer2 extends Applet {
  private class CircleListener extends MouseAdapter {
    private int radius = 25;
    public void mousePressed(MouseEvent event) {
      Graphics g = getGraphics();
      g.setColor(Color.blue);
      g.fillOval(event.getX()-radius,
               event.getY()-radius,
               2*radius, 2*radius);
  }
}

  public void init() {
    setBackground(Color.yellow);
    addMouseListener(new CircleListener());
  }
}