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POHow to Change java Cardlayout from another separate class
 

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  1. POHow to Change java Cardlayout from another separate class
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    <p>Please I have been trying to switch CardLayout from another class (JPanel) which is one of the card on the CardLayout, I have search and made research about this for a very long time but found nothing helpful.</p> <p>I have a CardLayout and two separate JPanels that I added to the CardLayout, now I want to be able to switch the cards after performing activities on the separate JPanel or separate class, so how do I switch the CardLayout from another class? my code below.</p> <pre><code>package myApp; import java.awt.CardLayout; public class TestmyCard extends javax.swing.JFrame { /** * Creates new form TestmyCard */ public TestmyCard() { initComponents(); jPanel1.add(new FirstCard(),"card3"); jPanel1.add(new SecondCard(),"card4"); } public void chgCard(String nwCard){ CardLayout cl = (CardLayout)(jPanel1.getLayout()); cl.show(jPanel1,nwCard); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // &lt;editor-fold defaultstate="collapsed" desc="Generated Code"&gt; private void initComponents() { jPanel1 = new javax.swing.JPanel(); jPanel2 = new javax.swing.JPanel(); jLabel1 = new javax.swing.JLabel(); jPanel3 = new javax.swing.JPanel(); jButton1 = new javax.swing.JButton(); jButton2 = new javax.swing.JButton(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jPanel1.setName("Cards"); jPanel1.setLayout(new java.awt.CardLayout()); jPanel2.setName("card2"); jLabel1.setText("second panel"); javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2); jPanel2.setLayout(jPanel2Layout); jPanel2Layout.setHorizontalGroup( jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel2Layout.createSequentialGroup() .addGap(119, 119, 119) .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 117, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(203, Short.MAX_VALUE)) ); jPanel2Layout.setVerticalGroup( jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel2Layout.createSequentialGroup() .addGap(140, 140, 140) .addComponent(jLabel1) .addContainerGap(92, Short.MAX_VALUE)) ); jPanel1.add(jPanel2, "card2"); jPanel3.setBackground(new java.awt.Color(153, 255, 153)); jButton1.setLabel("First Btn"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jButton2.setLabel("Second Btn"); jButton2.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton2ActionPerformed(evt); } }); javax.swing.GroupLayout jPanel3Layout = new javax.swing.GroupLayout(jPanel3); jPanel3.setLayout(jPanel3Layout); jPanel3Layout.setHorizontalGroup( jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jPanel3Layout.createSequentialGroup() .addContainerGap() .addComponent(jButton1) .addGap(18, 18, 18) .addComponent(jButton2) .addContainerGap(181, Short.MAX_VALUE)) ); jPanel3Layout.setVerticalGroup( jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel3Layout.createSequentialGroup() .addContainerGap(27, Short.MAX_VALUE) .addGroup(jPanel3Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jButton1) .addComponent(jButton2)) .addGap(20, 20, 20)) ); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 439, javax.swing.GroupLayout.PREFERRED_SIZE) .addGap(0, 0, Short.MAX_VALUE)) .addGroup(layout.createSequentialGroup() .addGap(37, 37, 37) .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap()) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, 246, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 25, Short.MAX_VALUE) .addComponent(jPanel3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap()) ); pack(); }// &lt;/editor-fold&gt; private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: CardLayout cl = (CardLayout)(jPanel1.getLayout()); cl.show(jPanel1,"card3"); //cl.next(jPanel1) ; } private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: CardLayout cl = (CardLayout)(jPanel1.getLayout()); cl.show(jPanel1,"card4"); } /** * @param args the command line arguments */ public static void main(String args[]) { /* * Set the Nimbus look and feel */ //&lt;editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) "&gt; /* * If Nimbus (introduced in Java SE 6) is not available, stay with the * default look and feel. For details see * http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html */ try { for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) { if ("Nimbus".equals(info.getName())) { javax.swing.UIManager.setLookAndFeel(info.getClassName()); break; } } } catch (ClassNotFoundException ex) { java.util.logging.Logger.getLogger(TestmyCard.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(TestmyCard.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(TestmyCard.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(TestmyCard.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //&lt;/editor-fold&gt; /* * Create and display the form */ java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new TestmyCard().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JButton jButton2; private javax.swing.JLabel jLabel1; private javax.swing.JPanel jPanel1; private javax.swing.JPanel jPanel2; private javax.swing.JPanel jPanel3; // End of variables declaration } </code></pre> <p>FirstCard (separate jpanel)</p> <pre><code>package myApp; public class FirstCard extends javax.swing.JPanel { /** * Creates new form FirstCard */ public FirstCard() { initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // &lt;editor-fold defaultstate="collapsed" desc="Generated Code"&gt; private void initComponents() { jLabel1 = new javax.swing.JLabel(); guName = new javax.swing.JTextField(); guAddrs = new javax.swing.JTextField(); jLabel14 = new javax.swing.JLabel(); jLabel15 = new javax.swing.JLabel(); guOccu = new javax.swing.JTextField(); jLabel16 = new javax.swing.JLabel(); guPhone = new javax.swing.JTextField(); jLabel1.setText("Guarantee Name :"); jLabel14.setText("Address :"); jLabel15.setText("Occupation :"); jLabel16.setText("Phone :"); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) .addGroup(layout.createSequentialGroup() .addComponent(jLabel14) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(guAddrs, javax.swing.GroupLayout.PREFERRED_SIZE, 158, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(layout.createSequentialGroup() .addComponent(jLabel16) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(guPhone, javax.swing.GroupLayout.PREFERRED_SIZE, 158, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(layout.createSequentialGroup() .addComponent(jLabel15) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(guOccu, javax.swing.GroupLayout.PREFERRED_SIZE, 158, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(layout.createSequentialGroup() .addComponent(jLabel1) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(guName, javax.swing.GroupLayout.PREFERRED_SIZE, 158, javax.swing.GroupLayout.PREFERRED_SIZE))) .addContainerGap(228, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(43, 43, 43) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent(guName, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel15) .addComponent(guOccu, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(30, 30, 30) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel14) .addComponent(guAddrs, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel16) .addComponent(guPhone, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addContainerGap(135, Short.MAX_VALUE)) ); }// &lt;/editor-fold&gt; // Variables declaration - do not modify private javax.swing.JTextField guAddrs; private javax.swing.JTextField guName; private javax.swing.JTextField guOccu; private javax.swing.JTextField guPhone; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel14; private javax.swing.JLabel jLabel15; private javax.swing.JLabel jLabel16; // End of variables declaration } </code></pre> <p>SecondCard (separate jpanel)</p> <pre><code>package myApp; public class SecondCard extends javax.swing.JPanel { /** * Creates new form SecondCard */ public SecondCard() { initComponents(); } /** * This method is called from within the constructor to initialize the form. * WARNING: Do NOT modify this code. The content of this method is always * regenerated by the Form Editor. */ @SuppressWarnings("unchecked") // &lt;editor-fold defaultstate="collapsed" desc="Generated Code"&gt; private void initComponents() { jLabel1 = new javax.swing.JLabel(); jButton1 = new javax.swing.JButton(); jLabel1.setText("this is the second card"); jButton1.setText("SwitchCard"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this); this.setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(120, 120, 120) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jButton1) .addComponent(jLabel1)) .addContainerGap(173, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(62, 62, 62) .addComponent(jLabel1) .addGap(18, 18, 18) .addComponent(jButton1) .addContainerGap(183, Short.MAX_VALUE)) ); }// &lt;/editor-fold&gt; private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: TestmyCard nc = new TestmyCard(); nc.chgCard("Card2"); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JLabel jLabel1; // End of variables declaration } </code></pre>
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    1. COFor reference, here's a working [example](http://stackoverflow.com/a/5655843/230513).
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    2. COIt appears that your `jpanel2` is an instance of `JPanel`, though you don't want that, what you want is that `jpanel2` to be an instance of `SecondCard` class.
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