import java.awt.Graphics;
import java.awt.Color;
import java.awt.Event;

public class Spots2 extends java.applet.Applet {

final int MAXSPOTS=10;
int xspots[]=new int[MAXSPOTS];
int yspots[]=new int[MAXSPOTS];
int currspots=0;

public void init() {
  setBackground(Color.white);
}

public boolean mouseDown(Event evt,int x,int y) {
  if (currspots<MAXSPOTS) addspot(x,y);

return true;
}

void addspot(int x,int y) {
	xspots[currspots]=x;
	yspots[currspots]=y;
 currspots++;
	repaint();
}

public void paint(Graphics g) {
		g.setColor(Color.black);
		g.drawRect(0,0,this.size().width -2,this.size().height -2);
		g.setColor(Color.blue);

	for (int i=0;i<currspots;i++) {
		g.fillOval(xspots[i]-10,yspots[i]-10,20,30);
	}
}
}