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

/*
 * The main work of the application is done in this JPanel-extending class.
 * This allows the java class to be run as a stand-alone application or
 * as an applet within a web browser.
 */
class RetirementCalculatorPanel extends JPanel implements ActionListener
{
    private JButton b;

    public RetirementCalculatorPanel()
    {
        setLayout(new BorderLayout());
        b = new JButton("Hi There");
        b.addActionListener(this);
        add("South", b);
    }

    public void actionPerformed(ActionEvent e)
    {
        b.setEnabled(false);
    }
}

/*
 * The "main" class of this file allows the app to be run as an applet
 * but also provides a "main" method to run as an application.
 */
public class RetirementCalculator extends JApplet
{
    final static private String PROG_NAME = "Josh's Retirement Calculator";

    RetirementCalculatorPanel panel;

    public void init()
    {
        setLayout(new BorderLayout());
        panel = new RetirementCalculatorPanel();
        add(panel, BorderLayout.CENTER);
    }

    public void destroy()
    {
    }

    public void start()
    {
    }

    public void stop()
    {
    }

    public static void main(String[] args)
    {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run()
            {
                JFrame frame = new JFrame(PROG_NAME);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

                RetirementCalculatorPanel panel =
                    new RetirementCalculatorPanel();
                frame.getContentPane().add(panel);

                frame.pack();
                frame.setVisible(true);
            }
        });
    }
}