JSliderの現在値に対応するラベルの文字色を変更する

slider.getModel().addChangeListener(new ChangeListener() {
  private int prev = -1;
  private void resetForeground(Object o, Color c) {
    if (o instanceof Component) {
      ((Component) o).setForeground(c);
    }
  }

  @Override public void stateChanged(ChangeEvent e) {
    BoundedRangeModel m = (BoundedRangeModel) e.getSource();
    int i = m.getValue();
    if ((slider.getMajorTickSpacing() == 0 ||
         i % slider.getMajorTickSpacing() == 0) && i != prev) {
      Dictionary dictionary = slider.getLabelTable();
      resetForeground(dictionary.get(i), Color.RED);
      resetForeground(dictionary.get(prev), Color.BLACK);
      slider.repaint();
      prev = i;
    }
  }
});