import java.awt.Canvas;

import java.awt.Color;

import java.awt.Graphics;

import javax.swing.JFrame;

public class Moire extends Canvas {

public static void main(String[] args) {

JFrame frame = new JFrame("Moire Pattern");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Canvas canvas = new Moire();

canvas.setSize(400, 400);

canvas.setBackground(Color.WHITE);

frame.add(canvas);

frame.pack();

frame.setVisible(true);

}

public void paint(Graphics g) {

int i = 90;

while (i < getWidth()) {

g.drawOval(0, 0, i, i);

i = i + 3;

}

}

}