// Ampel-Beispiel

import java.applet.*;
import java.awt.*;

public class ampel extends Applet
{
int nlampe = 0;

public void paint (Graphics g)
        {
        setBackground(Color.black);
        switch (nlampe)
	{
	case 0: g.setColor (Color.white);
	g.fillOval (5,5,40,40);
	g.fillOval (5,55,40,40);
        	g.fillOval (5,105,40,40);
	break;
	case 1: g.setColor (Color.red);
    	g.fillOval (5,5,40,40);
        	break;
	case 2: g.setColor (Color.yellow);
        	g.fillOval (5,55,40,40);
        	break;
	case 3: g.setColor (Color.green);
        	g.fillOval (5,105,40,40);
 	break;
	}
        }

public void setlampe(int x)
{
nlampe = x;
repaint();
}

}