Swing JTable transferFocus

import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.KeyStroke;

public class Main extends javax.swing.JFrame {

    public Main() {
        initComponents();
        forwardWithEnter(jTable1);
        backwardWithShiftEnter(jTable1);
    }

    private void forwardWithEnter(JTable table) {
        KeyStroke keystroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0);
        InputMap inputMap = table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
        inputMap.put(keystroke, "selectNextColumnCell");
    }

    private void backwardWithShiftEnter(JTable table) {
        KeyStroke keystroke = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, InputEvent.SHIFT_MASK);
        InputMap inputMap = table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
        inputMap.put(keystroke, "selectPreviousColumnCell");
    }
    
    @SuppressWarnings("unchecked")
    // 
    private void initComponents() {

        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null},
                {null, null, null},
                {null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3"
            }
        ));
        jScrollPane1.setViewportView(jTable1);

        getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);

        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.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    // End of variables declaration

}