Java tutorial
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JApplet; import javax.swing.JButton; public class MainClass extends JApplet { JButton button = new JButton("A very minimal applet"); public void init() { System.out.println("parameter=" + getParameter("param")); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.out.println("Button was clicked"); } }); getContentPane().add(button); } }