TabbedPane displays the panel incorrectly with FlowLayout child

Question

I copied the code example, TabbedPaneDemo.java from Sun/Java. Made some modifications. Now each panel with a FlowLayout. Got incorrect display in the beginning. If I manually select each of the tabs once, then the display becomes correct. Do not know what I have missed? Following is the modified code.
Please Help!!
Anna
* TabbedPaneDemo.java is a 1.4 example that requires one additional file:
* images/middle.gif.
import javax.swing.*;
import java.awt.*;
public class MyTabbedPaneDemo extends JPanel {
public MyTabbedPaneDemo() {
super(new GridLayout(1, 1));
JTabbedPane tabbedPane = new JTabbedPane();
int ct = 5;
JPanel panel[] = new JPanel[ct];
for ( int i=0; i<ct; i++ ) {
     panel[i] = new JPanel();     
     panel.setLayout( new FlowLayout( FlowLayout.LEFT, 0, 0 ) )     
     switch (i)
     case 0:
     panel[0].add( new Label( "U1" ) );               panel[0].add( new Label( "U2" ) );
     panel[0].add( new Label( "U3" ) );
     panel[0].add( new Label( "U4" ) );
     panel[0].add( new Label( "U5" ) );          
     tabbedPane.addTab("Tab 0", panel[0] );     
     break;                         
     case 1:
     panel[1].add( new Label( "U6" ) );
     panel[1].add( new Label( "U7" ) );
     panel[1].add( new Label( "U8" ) );
     panel[1].add( new Label( "U9" ) );
     panel[1].add( new Label( "U10" ) );                    tabbedPane.addTab("Tab 1", panel[1] );     
     break;
     case 2:
     panel[2].add( new Label( "U11" ) );
     panel[2].add( new Label( "U12" ) );
     panel[2].add( new Label( "U13" ) );                    tabbedPane.addTab("Tab 2", panel[2] );     
     break;
     case 3:
     panel[3].add( new Label( "U14" ) );
     tabbedPane.addTab("Tab 3", panel[3] );     
     break;
     case 4:
     panel[4].add( new Label( "U15" ) );
     tabbedPane.addTab("Tab 4", panel[4] );     
     break;
     default: System.out.println( " i=" + i );               }
panel[4].setPreferredSize(new Dimension(410, 50));
add(tabbedPane);
* 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();

Answer 1

There are some errors in the code while I cut and paste for it.
Please use this one.
* TabbedPaneDemo.java is a 1.4 example that requires one additional file:
* images/middle.gif.
import javax.swing.*;
import java.awt.*;
public class MyTabbedPaneDemo extends JPanel {
public MyTabbedPaneDemo() {
super(new GridLayout(1, 1));
JTabbedPane tabbedPane = new JTabbedPane();
int ct = 5;
JPanel panel[] = new JPanel[ct];
for ( int i=0; i<ct; i++ ) {
panel[i] = new JPanel();
panel.setLayout( new FlowLayout( FlowLayout.LEFT, 0, 0 ) );
switch (i)
case 0:
panel[0].add( new Label( "U1" ) ); panel[0].add( new Label( "U2" ) );
panel[0].add( new Label( "U3" ) );
panel[0].add( new Label( "U4" ) );
panel[0].add( new Label( "U5" ) );
tabbedPane.addTab("Tab 0", panel[0] );
break;
case 1:
panel[1].add( new Label( "U6" ) );
panel[1].add( new Label( "U7" ) );
panel[1].add( new Label( "U8" ) );
panel[1].add( new Label( "U9" ) );
panel[1].add( new Label( "U10" ) ); tabbedPane.addTab("Tab 1", panel[1] );
break;
case 2:
panel[2].add( new Label( "U11" ) );
panel[2].add( new Label( "U12" ) );
panel[2].add( new Label( "U13" ) ); tabbedPane.addTab("Tab 2", panel[2] );
break;
case 3:
panel[3].add( new Label( "U14" ) );
tabbedPane.addTab("Tab 3", panel[3] );
break;
case 4:
panel[4].add( new Label( "U15" ) );
tabbedPane.addTab("Tab 4", panel[4] );
break;
default: System.out.println( " i=" + i ); }
panel[4].setPreferredSize(new Dimension(410, 50));
add(tabbedPane);
* 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();