Quadrate rekursiv ausgeben

import java.awt.*;

public class Quadrate extends java.applet.Applet {
    public void paint (Graphics g) {
        quadrat(this, 100, 210, 210);
    }

    public void quadrat(Container ct, double l, double x, double y) {
        Graphics g = ct.getGraphics();
        if (l > 0.5) {
            g.setColor(Color.black);
            g.drawRect((int)(x-l), (int)(y-l), (int)(2*l), (int)(2*l));
            g.setColor(Color.yellow);
            g.fillRect((int)(x-l+1), (int)(y-l+1), (int)(2*l-1), (int)(2*l-1));     
            quadrat(ct, l/2, x-l, y-l);
        }
    }
}