Construct the object including its GUI
super("JFrameDemo");
Container cp = getContentPane();
cp.add(quitButton = new JButton("Exit"));
// Set up so that "Close" will exit the program,
// not just close the JFrame.
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// This "action handler" will be explained later in the chapter.
quitButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
dispose();
System.exit(0);
}
});
pack();
