/* * Swing version. */import java.awt.*;import java.awt.event.*;import javax.swing.*;public class CardWindow extends JFrame                        implements ItemListener {    boolean inAnApplet = true;         JPanel cards;    final static String BUTTONPANEL = "JPanel with JButtons";    final static String TEXTPANEL = "JPanel with JTextField";    public CardWindow() {        Container contentPane = getContentPane();        //Put the JComboBox in a JPanel to get a nicer look.        String comboBoxItems[] = { BUTTONPANEL, TEXTPANEL };        JPanel cbp = new JPanel();        JComboBox c = new JComboBox(comboBoxItems);        c.setEditable(false);        c.addItemListener(this);        cbp.add(c);        //Use the default layout manager, BorderLayout        contentPane.add(cbp, BorderLayout.NORTH);        cards = new JPanel();        cards.setLayout(new CardLayout());           JPanel p1 = new JPanel();        p1.add(new JButton("Button 1"));        p1.add(new JButton("Button 2"));        p1.add(new JButton("Button 3"));        JPanel p2 = new JPanel();        p2.add(new JTextField("TextField", 20));        cards.add(p1, BUTTONPANEL);        cards.add(p2, TEXTPANEL);        contentPane.add(cards, BorderLayout.CENTER);                addWindowListener(new WindowAdapter() {            public void windowClosing(WindowEvent e) {                if (inAnApplet) {                    dispose();                } else {                    System.exit(0);                }            }        });    }    public void itemStateChanged(ItemEvent evt) {        CardLayout cl = (CardLayout)(cards.getLayout());        cl.show(cards, (String)evt.getItem());    }    public static void main(String args[]) {        CardWindow window = new CardWindow();        window.inAnApplet = false;        window.setTitle("CardLayout");        window.pack();        window.setVisible(true);    }}