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    <p>In your provided code, you never added <code>FirstCard</code> and <code>SecondCard</code>, to the <code>JPanel</code> having layout set to <code>CardLayout</code>. Since what you writing is this : </p> <pre><code>jPanel1.add(jPanel2, "card2"); </code></pre> <p>here <code>jPanel2</code> is an instance of <code>JPanel</code>, as you have initialized this in your <code>TestmyClass</code> Class, as :</p> <pre><code>jPanel2 = new javax.swing.JPanel(); </code></pre> <p>instead I guess what you should be writing is :</p> <pre><code>jPanel2 = new SecondCard(passPanelWithCardLayoutAsArgument); // So that you can manoeuvre around b/w other JPanels </code></pre> <p>Here is a small working example for your help : </p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; public class CardLayoutExample { private JPanel contentPane; private MyPanel panel1; private MyPanel panel2; private MyPanel panel3; private void displayGUI() { JFrame frame = new JFrame("Card Layout Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel contentPane = new JPanel(); contentPane.setBorder( BorderFactory.createEmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new CardLayout()); panel1 = new MyPanel(contentPane , Color.RED.darker().darker()); panel2 = new MyPanel(contentPane , Color.GREEN.darker().darker()); panel3 = new MyPanel(contentPane , Color.DARK_GRAY); contentPane.add(panel1, "Panel 1"); contentPane.add(panel2, "Panel 2"); contentPane.add(panel3, "Panel 3"); frame.setContentPane(contentPane); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String... args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new CardLayoutExample().displayGUI(); } }); } } class MyPanel extends JPanel { private JButton jcomp1; private JPanel contentPane; private Color backgroundColour; public MyPanel(JPanel panel, Color c) { contentPane = panel; backgroundColour = c; setOpaque(true); setBackground(backgroundColour); //construct components jcomp1 = new JButton ("Show New Panel"); jcomp1.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { CardLayout cardLayout = (CardLayout) contentPane.getLayout(); cardLayout.next(contentPane); } }); add(jcomp1); } @Override public Dimension getPreferredSize() { return (new Dimension(500, 500)); } } </code></pre> <p><strong>LATEST EDIT :</strong> *<strong>Using your components and trying to put that into CardLayout, with this code : *</strong></p> <pre><code>import java.awt.*; import java.awt.event.*; import javax.swing.*; public class CardLayoutExample { private JPanel contentPane; private FirstCard panel1; private SecondCard panel2; private void displayGUI() { JFrame frame = new JFrame("Card Layout Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel contentPane = new JPanel(); contentPane.setBorder( BorderFactory.createEmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new CardLayout()); panel1 = new FirstCard(contentPane); panel2 = new SecondCard(contentPane); contentPane.add(panel1, "Panel 1"); contentPane.add(panel2, "Panel 2"); frame.setContentPane(contentPane); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String... args) { SwingUtilities.invokeLater(new Runnable() { public void run() { new CardLayoutExample().displayGUI(); } }); } } class FirstCard extends javax.swing.JPanel { private javax.swing.JTextField addField; private javax.swing.JTextField nameField; private javax.swing.JTextField occField; private javax.swing.JTextField phoneField; private javax.swing.JLabel nameLabel; private javax.swing.JLabel addLabel; private javax.swing.JLabel occLabel; private javax.swing.JLabel phoneLabel; private JPanel centerPanel; private JPanel contentPane; private JButton nextButton; public FirstCard(JPanel cp) { this.contentPane = cp; initComponents(); } private void initComponents() { setOpaque(true); setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); setBackground(Color.RED); setLayout(new BorderLayout(5, 5)); nameLabel = new javax.swing.JLabel("Guarantee Name : "); nameField = new javax.swing.JTextField(); addLabel = new javax.swing.JLabel("Address : "); addField = new javax.swing.JTextField(); occLabel = new javax.swing.JLabel("Occupation : "); occField = new javax.swing.JTextField(); phoneLabel = new javax.swing.JLabel("Phone : "); phoneField = new javax.swing.JTextField(); centerPanel = new JPanel(); nextButton = new JButton("Next"); nextButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent ae) { nextButtonAction(ae); } }); centerPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); centerPanel.setOpaque(true); centerPanel.setBackground(Color.WHITE); centerPanel.setLayout(new GridLayout(0, 2, 5, 5)); centerPanel.add(nameLabel); centerPanel.add(nameField); centerPanel.add(addLabel); centerPanel.add(addField); centerPanel.add(occLabel); centerPanel.add(occField); centerPanel.add(phoneLabel); centerPanel.add(phoneField); add(centerPanel, BorderLayout.CENTER); add(nextButton, BorderLayout.PAGE_END); } private void nextButtonAction(ActionEvent ae) { CardLayout layout = (CardLayout)contentPane.getLayout(); layout.next(contentPane); } } class SecondCard extends javax.swing.JPanel { private javax.swing.JButton nextButton; private javax.swing.JLabel textLabel; private JPanel contentPane; public SecondCard(JPanel cp) { contentPane = cp; initComponents(); } private void initComponents() { setOpaque(true); setBackground(Color.GREEN.darker().darker()); setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); textLabel = new JLabel("this is the second card", JLabel.CENTER); textLabel.setForeground(Color.WHITE); nextButton = new javax.swing.JButton(); nextButton.setText("SwitchCard"); nextButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { jButton1ActionPerformed(evt); } }); add(textLabel); add(nextButton); } private void jButton1ActionPerformed(ActionEvent evt) { CardLayout layout = (CardLayout) contentPane.getLayout(); layout.show(contentPane, "Panel 1"); } } </code></pre> <p><strong>Method to clear fields</strong></p> <pre><code>private void clearFields() { Component components[] = centerPanel.getComponents(); for (Component comp : components) { if (comp instanceof JTextField) { JTextField tfield = (JTextField) comp; tfield.setText(""); } else if (comp instanceof JComboBox) { JComboBox cbox = (JComboBox) comp; cbox.setSelectedIndex(0); } else if (comp instanceof JRadioButton) { JRadioButton rbut = (JRadioButton) comp; rbut.setSelected(false); } } } </code></pre> <p>And you will call this inside the <code>actionPerformed()</code> method of the Button, which will take you to the next Card.</p>
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    1. POHow to Change java Cardlayout from another separate class
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    1. COwhat if contentPane (jPanel) is private? the above will not work
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    2. COSee in my case `contentPane` is a `private variable`, and still it's working. See the **10th Line** of `CardLayoutExample` Class.
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    3. COok i change my i jPanel1 that contain the cardlayout to public and static access modifier and i was able to switch, so Kudos to you.
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