/* * TabDemo.java is a 1.4 application that requires no other files. * It's like CardLayoutDemo, but it uses a JTabbedPane instead * of a GUI centered around CardLayout. */import java.awt.*;import javax.swing.*;public class TabDemo {    final static String BUTTONPANEL = "JPanel with JButtons";    final static String TEXTPANEL = "JPanel with JTextField";    public void addComponentToPane(Container pane) {        JTabbedPane tabbedPane = new JTabbedPane();        //Create the "cards".        JPanel card1 = new JPanel() {            //Make the panel wider than it really needs, so            //the window's wide enough for the tabs to stay            //in one row.            public Dimension getPreferredSize() {                Dimension size = super.getPreferredSize();                size.width += 100;                return size;            }        };        card1.add(new JButton("Button 1"));        card1.add(new JButton("Button 2"));        card1.add(new JButton("Button 3"));        JPanel card2 = new JPanel();        card2.add(new JTextField("TextField", 20));        tabbedPane.addTab(BUTTONPANEL, card1);        tabbedPane.addTab(TEXTPANEL, card2);        pane.add(tabbedPane, BorderLayout.CENTER);    }    /**     * Create the GUI and show it.  For thread safety,     * this method should be invoked from the     * event-dispatching thread.     */    private static void createAndShowGUI() {        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("TabDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        TabDemo demo = new TabDemo();        demo.addComponentToPane(frame.getContentPane());        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event-dispatching thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}