A CardLayout problem--wrong parent for CardLayout

Question

I am trying to use CardLayout so that only one of the several panels I crete will be display at a time. However, JBuilder gives me the "java.lang.IllegalArgumentException:wrong parent for CardLayout
"error. What's wrong?
package nestedlayouts;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
public class Frame1 extends JFrame implements ActionListener{
CardLayout cl = new CardLayout();
JPanel cardPanel = new JPanel(cl);
JPanel welcomePane;
JPanel balancePane;
JButton balanceButton = new JButton();
JButton welcomeButton = new JButton();
//Construct the frame
public Frame1() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
try {
jbInit();
catch (Exception e) {
e.printStackTrace();
//Component initialization
private void jbInit() throws Exception {
Container content = getContentPane();
content.add(cardPanel );
welcomePane = new JPanel();
welcomePane.setLayout(null);
welcomeButton.setText("Welcome");
welcomeButton.setBounds(new Rectangle(90, 180, 196, 56));
welcomeButton.addActionListener(this);
welcomePane.setName("welcomePane");
cardPanel.add("welcomePane",welcomePane);
welcomePane.add(welcomeButton, null);
balanceButton.setText("ShowBalance");
balanceButton.setBounds(new Rectangle(154, 181, 196, 56));
balanceButton.addActionListener(this);
balancePane = new JPanel();
balancePane.setLayout(null);
balancePane.add(balanceButton, null);
balancePane.setName("balancePane");
cardPanel.add("balancePane",balancePane);
this.setSize(new Dimension(509, 333));
this.setTitle("ATM");
show();
//Overridden so we can exit when window is closed
protected void processWindowEvent(WindowEvent e) {
super.processWindowEvent(e);
if (e.getID() == WindowEvent.WINDOW_CLOSING) {
System.exit(0);
public void actionPerformed(ActionEvent e) {
if ( ( (JButton) e.getSource()).getText().equals("ShowBalance")) {
showPanel(1);
else if ( ( (JButton) e.getSource()).getText().equals("Welcome")){
showPanel(2);
private void showPanel(int num) {
if (num == 2) {
cl.show(balancePane, "balancePane");
else if (num == 1){
}

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//import com.borland.jbcl.layout.*;
public class bigeyes extends JFrame implements ActionListener{
  CardLayout cl = new CardLayout();
  JPanel cardPanel = new JPanel(cl);
  JPanel welcomePane;
  JPanel balancePane;
  JButton balanceButton = new JButton();
  JButton welcomeButton = new JButton();
  //Construct the frame
  public bigeyes() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    catch (Exception e) {
      e.printStackTrace();
  //Component initialization
  private void jbInit() throws Exception {
    Container content = getContentPane();
    content.add(cardPanel );
    welcomePane = new JPanel();
    welcomePane.setLayout(null);
    welcomeButton.setText("Welcome");
    welcomeButton.setBounds(new Rectangle(90, 180, 196, 56));
    welcomeButton.addActionListener(this);
    welcomePane.setName("welcomePane");
    cardPanel.add("welcomePane",welcomePane);
    welcomePane.add(welcomeButton, null);
    balanceButton.setText("ShowBalance");
    balanceButton.setBounds(new Rectangle(154, 181, 196, 56));
    balanceButton.addActionListener(this);
    balancePane = new JPanel();
    balancePane.setLayout(null);
    balancePane.add(balanceButton, null);
    balancePane.setName("balancePane");
    cardPanel.add("balancePane",balancePane);
    this.setSize(new Dimension(509, 333));
    this.setTitle("ATM");
    show();
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
  public void actionPerformed(ActionEvent e) {
    if ( ( (JButton) e.getSource()).getText().equals("ShowBalance")) {
      showPanel(1);
    else if ( ( (JButton) e.getSource()).getText().equals("Welcome")){
      showPanel(2);
  private void showPanel(int num) {
    if (num == 2) {
      // cardPanel is the parent, balancePane is the child (card)
      // that you added to the parent and now want to show
      // key: parent,     card name
      cl.show(cardPanel, "balancePane");  // error was pointing to this line
    else if (num == 1){
  public static void main(String[] args) {
    new bigeyes();
}