Behavior of a JComboBox in a JTable - Fix

import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JComboBox;
import javax.swing.JList;
import javax.swing.JTextField;
import javax.swing.plaf.basic.ComboPopup;

/**
 * This is a quick fix to change the behavior of a JComboBox in a JTable.
 *
 * In a normal editable JComboBox the user is able to select entries with the arrow keys.
 * On each change the value of the JTextField (editorComponent) changes as well and you can
 * leave the ComboBox with TAB.
 *
 * In a JTable this described behavior changes. The value of the JTextField does not change
 * when a different value in the list gets selected. So the user is forced to press the
 * enter key in order to save the value.
 *
 * This ClientProperty triggers this change.
 * combobox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
 *
 * I can give no warranty that this will work in every case. But for me it simply did it.
 *
 * If you have any suggestions please write me a mail to wolfgang.jentner[at]sfg-singen.de
 *
 * @author Wolfgang Jentner
 *
 */
public class ComboBoxTableFix {
    /**
     * This is a decorator method. Simply put your JComboBox in.
     *
     * @param combobox - An editable JComboBox.
     */
    public static void fix(JComboBox combobox) {
        if(!combobox.isEditable()) return;

        final JList c_list = ((ComboPopup) combobox.getUI().getAccessibleChild(combobox, 0)).getList();
        final JTextField c_field = (JTextField) combobox.getEditor().getEditorComponent();

        c_field.addKeyListener(new KeyListener() {

            @Override
            public void keyTyped(KeyEvent e) {}

            @Override
            public void keyReleased(KeyEvent e) {
                if(e.getKeyCode() == KeyEvent.VK_DOWN || e.getKeyCode() == KeyEvent.VK_UP) {
                    Object val = c_list.getSelectedValue();
                    if(val != null) {
                        c_field.setText(String.valueOf(val));
                    }
                    c_field.selectAll();
                }
            }

            @Override
            public void keyPressed(KeyEvent e) {}
        });
    }
}