import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TrafficLightPanel extends JPanel{

    private Light light;
    private JButton button;

    public TrafficLightPanel(){
	light = new Light();
	button = new JButton ("Change Light");
	button.addActionListener(new TLButtonListener());
	add (light);
	add (button);
	setBackground(Color.white);
    }

    private class TLButtonListener implements ActionListener{
	public void actionPerformed (ActionEvent event){
	    light.changeLight();
	}

    }
}