Circles (Loops)

[Zebra]

I have to write and applet in which I draw 4 concentric circles. I have to use this code looped 4 times. Not only do I have to loop it. I have to make each circle. Each circle's radius must be twice as large as the circle before it.

Code:

g.drawOval()

Thanks.

[hardwired]

Code:

// <applet code="ConcentricApplet" width="400" height="400"></applet>
import java.awt.*;
import javax.swing.*;

public class ConcentricApplet extends JApplet {
    public void init() {
        setLayout(new BorderLayout());
        add(new ConcentricPanel());
    }
}

class ConcentricPanel extends JPanel {
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        int w = getWidth();
        int h = getHeight();
        int r = Math.min(w, h)/8;
        int cx = w/2;
        int cy = h/2;
        for(int i = 0; i < 4; i++) {
            int d = (i+1)*r;
            int x = cx - d/2;
            int y = cy - d/2;
            g2.drawOval(x, y, d, d);
        }
    }
}