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

public class MyJavaApp
{
    public static void main(String[] args)
    {
        // create a button
        JButton button = new JButton("Press me!");

        // register the event handler for pressing the button
        button.addActionListener(new MyButtonListener());

        // organize the layout of the window
        JPanel pane = new JPanel();
        pane.add(button);
        JFrame frame = new JFrame("My Application");
        frame.getContentPane().add(pane, BorderLayout.CENTER);

        // register the event handler for closing the window
        frame.addWindowListener(new MyWindowListener());

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

// this class implements the event handler for a button
class MyButtonListener implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
        System.out.println("I was pressed!!!");
    }
}

// this class implements the event handler for
// closing the window
class MyWindowListener extends WindowAdapter
{
    public void windowClosing(WindowEvent e)
    {
        System.exit(0);
    }
}