/*  * TabbedPaneDemo.java is a 1.4 example that requires one additional file: *   images/middle.gif.  */import javax.swing.JTabbedPane;import javax.swing.ImageIcon;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JFrame;import javax.swing.JComponent;import java.awt.BorderLayout;import java.awt.Dimension;import java.awt.GridLayout;import java.awt.event.KeyEvent;public class TabbedPaneDemo extends JPanel {    public TabbedPaneDemo() {        super(new GridLayout(1, 1));        JTabbedPane tabbedPane = new JTabbedPane();        ImageIcon icon = createImageIcon("images/middle.gif");        JComponent panel1 = makeTextPanel("Panel #1");        tabbedPane.addTab("Tab 1", icon, panel1,                          "Does nothing");        tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);        JComponent panel2 = makeTextPanel("Panel #2");        tabbedPane.addTab("Tab 2", icon, panel2,                          "Does twice as much nothing");        tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);        JComponent panel3 = makeTextPanel("Panel #3");        tabbedPane.addTab("Tab 3", icon, panel3,                          "Still does nothing");        tabbedPane.setMnemonicAt(2, KeyEvent.VK_3);        JComponent panel4 = makeTextPanel(                "Panel #4 (has a preferred size of 410 x 50).");	panel4.setPreferredSize(new Dimension(410, 50));        tabbedPane.addTab("Tab 4", icon, panel4,                          "Does nothing at all");        tabbedPane.setMnemonicAt(3, KeyEvent.VK_4);        //Add the tabbed pane to this panel.        add(tabbedPane);                //Uncomment the following line to use scrolling tabs.        //tabbedPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);    }    protected JComponent makeTextPanel(String text) {        JPanel panel = new JPanel(false);        JLabel filler = new JLabel(text);        filler.setHorizontalAlignment(JLabel.CENTER);        panel.setLayout(new GridLayout(1, 1));        panel.add(filler);        return panel;    }    /** Returns an ImageIcon, or null if the path was invalid. */    protected static ImageIcon createImageIcon(String path) {        java.net.URL imgURL = TabbedPaneDemo.class.getResource(path);        if (imgURL != null) {            return new ImageIcon(imgURL);        } else {            System.err.println("Couldn't find file: " + path);            return null;        }    }    /**     * 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("TabbedPaneDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        JComponent newContentPane = new TabbedPaneDemo();        newContentPane.setOpaque(true); //content panes must be opaque        frame.getContentPane().add(new TabbedPaneDemo(),                                 BorderLayout.CENTER);        //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();            }        });    }}