Swing transferFocus use addActionForKeyStroke

import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.KeyStroke;
import javax.swing.text.JTextComponent;
import javax.swing.text.Keymap;

public class Main extends javax.swing.JFrame {

   public Main() {
       initComponents();

//      get default keymap
       Keymap keymap = JTextComponent.getKeymap(JTextComponent.DEFAULT_KEYMAP);

//      transferFocus with Enter
       Action transferFocusAction = new AbstractAction() {

           public void actionPerformed(ActionEvent e) {
               Object source = e.getSource();
               if (source instanceof Component) {
                   ((Component) source).transferFocus();
               }
           }
       };
       KeyStroke enterKeystroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0);
       keymap.addActionForKeyStroke(enterKeystroke, transferFocusAction);

//      transferFocusBackward witg Shift + Enter
       Action transferFocusBackwardAction = new AbstractAction() {

           public void actionPerformed(ActionEvent e) {
               Object source = e.getSource();
               if (source instanceof Component) {
                   ((Component) source).transferFocusBackward();
               }
           }
       };
       KeyStroke shiftEnterKeystroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, InputEvent.SHIFT_MASK);
       keymap.addActionForKeyStroke(shiftEnterKeystroke, transferFocusBackwardAction);
   }

   @SuppressWarnings("unchecked")
   //                          
   private void initComponents() {

       jTextField1 = new javax.swing.JTextField();
       jTextField2 = new javax.swing.JTextField();
       jTextField3 = new javax.swing.JTextField();

       setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

       jTextField1.setText("forward: Enter");
       getContentPane().add(jTextField1, java.awt.BorderLayout.PAGE_START);

       jTextField2.setText("backward: Shift + Enter");
       getContentPane().add(jTextField2, java.awt.BorderLayout.CENTER);

       jTextField3.setText("jTextField3");
       getContentPane().add(jTextField3, java.awt.BorderLayout.PAGE_END);

       pack();
   }//                        

   public static void main(String args[]) {
       java.awt.EventQueue.invokeLater(new Runnable() {
           public void run() {
               new Main().setVisible(true);
           }
       });
   }

   // Variables declaration - do not modify                    
   private javax.swing.JTextField jTextField1;
   private javax.swing.JTextField jTextField2;
   private javax.swing.JTextField jTextField3;
   // End of variables declaration                  

}