I am creating a menu swing application, I used a splitpane and the right component to import various jpanel

Question

I am creating a menu swing application, I used a splitpane and the right component to import various jpanel. Once I click the home panel buttion, the other jpanel are not loading if I press the coressponding buttion

import javax.swing.JOptionPane;

/**
 *
 * @author 
 */
public class Mainframe extends javax.swing.JFrame {

    /**
     * Creates new form Mainframe
     */
    
    



    int n=0;

    public Mainframe() {
        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")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jButton2 = new javax.swing.JButton();
        SplitPane = new javax.swing.JSplitPane();
        jPanel2 = new javax.swing.JPanel();
        jButton3 = new javax.swing.JButton();
        workpanel = new javax.swing.JPanel();
        jButton4 = new javax.swing.JButton();
        jButton5 = new javax.swing.JButton();

        jButton2.setText("Home");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton3.setText("Back");
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
        jPanel2.setLayout(jPanel2Layout);
        jPanel2Layout.setHorizontalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel2Layout.createSequentialGroup()
                .addComponent(jButton3)
                .addGap(0, 28, Short.MAX_VALUE))
        );
        jPanel2Layout.setVerticalGroup(
            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()
                .addContainerGap(391, Short.MAX_VALUE)
                .addComponent(jButton3)
                .addGap(225, 225, 225))
        );

        SplitPane.setLeftComponent(jPanel2);

        jButton4.setText("User");
        jButton4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton4ActionPerformed(evt);
            }
        });

        jButton5.setText("Admin");
        jButton5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton5ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout workpanelLayout = new javax.swing.GroupLayout(workpanel);
        workpanel.setLayout(workpanelLayout);
        workpanelLayout.setHorizontalGroup(
            workpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(workpanelLayout.createSequentialGroup()
                .addContainerGap(403, Short.MAX_VALUE)
                .addGroup(workpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, workpanelLayout.createSequentialGroup()
                        .addComponent(jButton4)
                        .addGap(274, 274, 274))
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, workpanelLayout.createSequentialGroup()
                        .addComponent(jButton5)
                        .addGap(259, 259, 259))))
        );
        workpanelLayout.setVerticalGroup(
            workpanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(workpanelLayout.createSequentialGroup()
                .addGap(245, 245, 245)
                .addComponent(jButton4)
                .addGap(112, 112, 112)
                .addComponent(jButton5)
                .addContainerGap(237, Short.MAX_VALUE))
        );

        SplitPane.setRightComponent(workpanel);

        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(SplitPane)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(SplitPane)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        Userjpanel user = new Userjpanel();
        SplitPane.setRightComponent(user);
        
    }                                        

    private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        AdminJpanel add = new AdminJpanel();
        SplitPane.setRightComponent(add);
    }                                        

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        Mainframe home = new Mainframe();
        SplitPane.setRightComponent(home.workpanel);
    }                                        

    private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
        Userjpanel user = new Userjpanel();
        SplitPane.setRightComponent(user);
    }                                        

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* 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(Mainframe.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Mainframe.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Mainframe.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Mainframe.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
            new Mainframe().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JSplitPane SplitPane;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JButton jButton4;
    private javax.swing.JButton jButton5;
    private javax.swing.JPanel jPanel2;
    private javax.swing.JPanel workpanel;
    // End of variables declaration                   
}

The code above is what I have used

Answer 1

Mainframe home = new Mainframe();
SplitPane.setRightComponent(home.workpanel);

In your "Back" button logic don't keep creating a new instance of you "Mainframe" class. You only ever need one instance of the frame.

You just need to access your "workpanel" instance in your class:

//Mainframe home = new Mainframe();
//SplitPane.setRightComponent(home.workpanel);
SplitPane.setRightComponent(workpanel);

Also, variable names should NOT start with a upper case character. Learn and follow Java naming conventions.