Where to add the sorting code/codes in these codes below so that it displays in ascending order the surname and name. Only the surname must be in ascending order, then together with the name. There should be no errors.The codes are below:

import javax.swing.JOptionPane; import javax.swing.table.DefaultTableModel;

public class NewJFrame extends javax.swing.JFrame {

/** * Creates new form NewJFrame */ public NewJFrame() { 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") // private void initComponents() {

jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); txtname = new javax.swing.JTextField(); txtsurname = new javax.swing.JTextField(); txtage = new javax.swing.JTextField(); btnadd = new javax.swing.JButton(); jScrollPane1 = new javax.swing.JScrollPane(); jTable1 = new javax.swing.JTable();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jLabel1.setText("Name");

jLabel2.setText("Surname");

jLabel3.setText("Age");

btnadd.setText("Import"); btnadd.setActionCommand("IMPORT"); btnadd.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { btnaddActionPerformed(evt); } });

jTable1.setModel(new javax.swing.table.DefaultTableModel( new Object [][] { {null, null, null}, {null, null, null}, {null, null, null}, {null, null, null} }, new String [] { "Name", "Surname", "Age" } )); jScrollPane1.setViewportView(jTable1);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(73, 73, 73) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(btnadd) .addGroup(layout.createSequentialGroup() .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel1) .addComponent(jLabel2) .addComponent(jLabel3)) .addGap(41, 41, 41) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent(txtname) .addComponent(txtsurname) .addComponent(txtage, javax.swing.GroupLayout.DEFAULT_SIZE, 143, Short.MAX_VALUE)))) .addContainerGap(143, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(53, 53, 53) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel1) .addComponent(txtname, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(18, 18, 18) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel2) .addComponent(txtsurname, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(18, 18, 18) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(jLabel3) .addComponent(txtage, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(33, 33, 33) .addComponent(btnadd) .addGap(43, 43, 43) .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 151, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(268, Short.MAX_VALUE)) );

pack(); }//

private void btnaddActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: if(txtname.getText().equals("")||txtsurname.getText().equals("")||txtage.getText().equals("")){ JOptionPane.showMessageDialog(this, "Please enter all data"); }else{ String data[]= {txtname.getText(),txtsurname.getText(), txtage.getText() }; DefaultTableModel tblModel= (DefaultTableModel)jTable1.getModel(); tblModel.addRow(data); JOptionPane.showMessageDialog(this, "Data added successfully"); txtname.setText(""); txtsurname.setText(""); txtage.setText(""); }

/** * @param args the command line arguments */ public static void main(String args[]) { /* Set the Nimbus look and feel */ // /* 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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //

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

// Variables declaration - do not modify private javax.swing.JButton btnadd; private javax.swing.JLabel jLabel1; private javax.swing.JLabel jLabel2; private javax.swing.JLabel jLabel3; private javax.swing.JScrollPane jScrollPane1; private javax.swing.JTable jTable1; private javax.swing.JTextField txtage; private javax.swing.JTextField txtname; private javax.swing.JTextField txtsurname; // End of variables declaration }