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Код

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

public class ClickMe extends Applet implements MouseListener {
    private Spot spot = null;
    private static final int RADIUS = 7;

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

    public void paint(Graphics g) {
     //draw a black border and a white background
     g.setColor(Color.blue);
     g.fillRect(0, 0, getSize().width - 1, getSize().height - 1);
     g.setColor(Color.black);
     g.drawRect(0, 0, getSize().width - 1, getSize().height - 1);

     //draw the spot
     g.setColor(Color.red);
     if (spot != null) {
         g.fillOval(spot.x - RADIUS, spot.y - RADIUS, RADIUS * 2, RADIUS * 2);
        }
    }

    public void mousePressed(MouseEvent event) {   
     if (spot == null) {
         spot = new Spot(RADIUS);
     }
     spot.x = event.getX();
     spot.y = event.getY();
     repaint();
    }

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

public class Spot {
    public int size;
    public int x, y;
  
    public Spot(int intRadius) {
        size = intRadius;
        x = -1;
        y = -1;
    }
}