C#

import javax.swing.*; public class LightSwitch { private ToggleButton button; private BinaryCounter counter; public LightSwitch() { button=new ToggleButton("off","on"); counter=new BinaryCounter(0); button.addActionListener(counter); JPanel contentPane=new JPanel(); contentPane.add(button); contentPane.add(counter); JFrame frame=new JFrame("LightSwitch"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setContentPane(contentPane); frame.pack(); frame.setSize(500,200); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new LightSwitch(); } }); } }