import javax.swing.JFrame;
import javax.swing.JButton;


public class FirstWindow extends JFrame
{
    public static final int WIDTH = 300; 
    public static final int HEIGHT = 200;

    public FirstWindow( )
    {
        super( );
        setSize(WIDTH, HEIGHT);

        setTitle("First Window Class");

        setDefaultCloseOperation(
                              JFrame.DO_NOTHING_ON_CLOSE);

        JButton endButton = new JButton("Click to end program.");
        endButton.addActionListener(new EndingListener( ));
        getContentPane( ).add(endButton);
    }
}