Learning how to use Layout Managers

Question

The code that is included in this post is public code from the SUN tutorials. I am trying to learn how to use the layouts and add individual programs that were created to each component in the layouts.
This is what I am exploring:
I want to have a tabbed layout like the example TabbedPaneDemo located at http://java.sun.com/docs/books/tutorial/uiswing/examples/components/index.html#TabbedPaneDemo. Below is the code.
In one of the tabs, I want to place a button and report in it. When the button is clicked, I want the report refreshed. Eventually I will be populating an array with data. The report I want to use the example SimpleTableDemo located at http://java.sun.com/docs/books/tutorial/uiswing/examples/components/SimpleTableDemoProject/src/components/SimpleTableDemo.java. Below is the code.
From what I have learned, you can place a container inside a container. So I should be able to place the SimpleTableDemo inside the tab 4 of the TabbedPaneDemo.
If this is indeed correct, then how do I put these two things together? I am getting a little lost in all the code.
Any assistance in helping me learn how to create and use layout managers would be appreciated.
package components;
* TabbedPaneDemo.java 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 javax.swing.SwingUtilities;
import javax.swing.UIManager;
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);
        //The following line enables 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 dispatch thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("TabbedPaneDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Add content to the window.
        frame.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 dispatch thread:
        //creating and showing this application's GUI.
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                //Turn off metal's use of bold fonts
          UIManager.put("swing.boldMetal", Boolean.FALSE);
          createAndShowGUI();
package components;
* SimpleTableDemo.java requires no other files.
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
public class SimpleTableDemo extends JPanel {
    private boolean DEBUG = false;
    public SimpleTableDemo() {
        super(new GridLayout(1,0));
        String[] columnNames = {"First Name",
                                "Last Name",
                                "Sport",
                                "# of Years",
                                "Vegetarian"};
        Object[][] data = {
            {"Mary", "Campione",
             "Snowboarding", new Integer(5), new Boolean(false)},
            {"Alison", "Huml",
             "Rowing", new Integer(3), new Boolean(true)},
            {"Kathy", "Walrath",
             "Knitting", new Integer(2), new Boolean(false)},
            {"Sharon", "Zakhour",
             "Speed reading", new Integer(20), new Boolean(true)},
            {"Philip", "Milne",
             "Pool", new Integer(10), new Boolean(false)}
        final JTable table = new JTable(data, columnNames);
        table.setPreferredScrollableViewportSize(new Dimension(500, 70));
        table.setFillsViewportHeight(true);
        if (DEBUG) {
            table.addMouseListener(new MouseAdapter() {
                public void mouseClicked(MouseEvent e) {
                    printDebugData(table);
        //Create the scroll pane and add the table to it.
        JScrollPane scrollPane = new JScrollPane(table);
        //Add the scroll pane to this panel.
        add(scrollPane);
    private void printDebugData(JTable table) {
        int numRows = table.getRowCount();
        int numCols = table.getColumnCount();
        javax.swing.table.TableModel model = table.getModel();
        System.out.println("Value of data: ");
        for (int i=0; i < numRows; i++) {
            System.out.print("    row " + i + ":");
            for (int j=0; j < numCols; j++) {
                System.out.print("  " + model.getValueAt(i, j));
            System.out.println();
        System.out.println("--------------------------");
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("SimpleTableDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //Create and set up the content pane.
        SimpleTableDemo newContentPane = new SimpleTableDemo();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);
        //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();
}

Answer 1

Before I did what you suggested, which I appreciate your input, I wanted to run the code first.
I tried to run the SimpleTableDemo and received the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: SimpleTableDemo (wrong name: componets/SimpleTableDemo)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader...
there are several more lines but as I was typing them out I thought that maybe the code is not written to run it in the command window. The errors seem to be around the ClassLoader. Is that correct? On the SUN example page when you launch the program a Java Web Start runs. So does this mean that the code is designed to only run in WebStart?