import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;

public class testMouseListener {
    public static void main(String[] args) {
        new myFrame1("Drawing");
    }
}

class myFrame1 extends Frame{
    ArrayList points;
    public myFrame1(String string){
        super(string);
        setBounds(200,200,400,300);
        points = new ArrayList();
        this.addMouseListener(new myMouseListener());
        setVisible(true);
    }

    @Override
    public void paint(Graphics g) {
        //super.paint(g);
        Iterator iterator= points.iterator();
        while (iterator.hasNext()){
            Point point = (Point) iterator.next();
            g.setColor(Color.CYAN);
            g.fillOval(point.x,point.y,30,30);
        }
    }

    public void addPaint(Point point){
        points.add(point);
    }

    private class myMouseListener extends MouseAdapter{
        @Override
        public void mousePressed(MouseEvent e) {
            //super.mousePressed(e);
            myFrame1 myframe1 = (myFrame1) e.getSource();
            myframe1.addPaint(new Point(e.getX(),e.getY()));
            myframe1.repaint();
        }
    }
}