C#

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class ToggleButton extends JButton implements ActionListener { private String label1, label2; public ToggleButton(String label1, String label2) { super(label1); this.label1=label1; this.label2=label2; addActionListener(this); } public void actionPerformed(ActionEvent e) { String s=label1; label1=label2; label2=s; setText(label1); } }