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

/** Draw circles centered where the user clicks.
 *  Uses inner classes.
 *  1998 Marty Hall, http://www.apl.jhu.edu/~hall/java/.
 */

public class DrawCircles4B extends Applet {
  public void init() {
    setForeground(Color.blue);
    MouseListener circleListener =
      new MouseAdapter() {
        private final int radius = 25;

        public void mousePressed(MouseEvent event) {
          Graphics g = getGraphics();
          g.fillOval(event.getX()-radius,
                     event.getY()-radius,
                     2*radius,
                     2*radius);
        }
    };
    addMouseListener(circleListener);
  }
}