public MainPanel() {
    super(new BorderLayout());

    InputMap im = table.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
    KeyStroke tab = KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0);
    KeyStroke enter = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, 0);
    KeyStroke stab = KeyStroke.getKeyStroke(KeyEvent.VK_TAB, InputEvent.SHIFT_DOWN_MASK);
    KeyStroke senter = KeyStroke.getKeyStroke(KeyEvent.VK_ENTER, InputEvent.SHIFT_DOWN_MASK);
    im.put(tab, im.get(enter));
    im.put(stab, im.get(senter));

    final Color orgColor = table.getSelectionBackground();
    final Color tflColor = this.getBackground();
    table.addFocusListener(
        new FocusListener() {
          @Override
          public void focusGained(FocusEvent e) {
            table.setSelectionForeground(Color.WHITE);
            table.setSelectionBackground(orgColor);
          }

          @Override
          public void focusLost(FocusEvent e) {
            table.setSelectionForeground(Color.BLACK);
            table.setSelectionBackground(tflColor);
          }
        });

    table.setComponentPopupMenu(new TablePopupMenu());
    add(new JScrollPane(table));
    setPreferredSize(new Dimension(320, 240));
  }
 // -------->
 // original code:
 // ftp://ftp.oreilly.de/pub/examples/english_examples/jswing2/code/goodies/Mapper.java
 // modified by terai
 //     private Hashtable<Object, ArrayList<KeyStroke>> buildReverseMap(InputMap im) {
 //         Hashtable<Object, ArrayList<KeyStroke>> h = new Hashtable<>();
 //         if (Objects.isNull(im.allKeys())) {
 //             return h;
 //         }
 //         for (KeyStroke ks: im.allKeys()) {
 //             Object name = im.get(ks);
 //             if (h.containsKey(name)) {
 //                 h.get(name).add(ks);
 //             } else {
 //                 ArrayList<KeyStroke> keylist = new ArrayList<>();
 //                 keylist.add(ks);
 //                 h.put(name, keylist);
 //             }
 //         }
 //         return h;
 //     }
 private void loadBindingMap(Integer focusType, InputMap im, ActionMap am) {
   if (Objects.isNull(im.allKeys())) {
     return;
   }
   ActionMap tmpAm = new ActionMap();
   for (Object actionMapKey : am.allKeys()) {
     tmpAm.put(actionMapKey, am.get(actionMapKey));
   }
   for (KeyStroke ks : im.allKeys()) {
     Object actionMapKey = im.get(ks);
     Action action = am.get(actionMapKey);
     if (Objects.isNull(action)) {
       model.addBinding(new Binding(focusType, "____" + actionMapKey.toString(), ks.toString()));
     } else {
       model.addBinding(new Binding(focusType, actionMapKey.toString(), ks.toString()));
     }
     tmpAm.remove(actionMapKey);
   }
   if (Objects.isNull(tmpAm.allKeys())) {
     return;
   }
   for (Object actionMapKey : tmpAm.allKeys()) {
     model.addBinding(new Binding(focusType, actionMapKey.toString(), ""));
   }
 }
 private static void installActions(JTable table) {
   InputMap inputMap = table.getInputMap(WHEN_FOCUSED);
   inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_END, 0), "selectLastRow");
   inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_HOME, 0), "selectFirstRow");
   inputMap.put(
       KeyStroke.getKeyStroke(KeyEvent.VK_HOME, KeyEvent.SHIFT_DOWN_MASK),
       "selectFirstRowExtendSelection");
   inputMap.put(
       KeyStroke.getKeyStroke(KeyEvent.VK_END, KeyEvent.SHIFT_DOWN_MASK),
       "selectLastRowExtendSelection");
 }