furacao de quadrilateros

import java.awt.*;import java.awt.Event.*;import javax.swing.*;public class Grafico extends JFrame {    int position;        private JButton bt;          public Grafico () {        super("Teste de uma Classe Gráfica");        this.setSize(600,600);        this.setVisible(true);      }    public void paint (Graphics g) {        super.paint(g);        for(int i=0;i<5000;i++)        {        g.setColor(new Color                 (position = (int)(Math.random()* 256),                position = (int)(Math.random()* 256),                position = (int)(Math.random()* 256)));                        g.fillRect((int)(Math.random()* 200)+23,                    (int)(Math.random()* 200)+23,                   (int)(Math.random()* 200)+23,                   (int)(Math.random()* 200)+23);        }      }            public static void main(String[] args) {        new Grafico().setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    }}