JSpinnerのボタンにToolTipを付ける

private static class MySpinnerUI extends BasicSpinnerUI {
  @Override protected Component createNextButton() {
    JComponent nextButton = (JComponent) super.createNextButton();
    nextButton.setToolTipText("SpinnerUI: next next");
    return nextButton;
  }

  @Override protected Component createPreviousButton() {
    JComponent previousButton = (JComponent) super.createPreviousButton();
    previousButton.setToolTipText("SpinnerUI: prev prev");
    return previousButton;
  }
}

private static void searchSpinnerButtons(Container comp) {
  for (Component c: comp.getComponents()) {
    if ("Spinner.nextButton".equals(c.getName())) {
      ((JButton) c).setToolTipText("getName: next next");
    } else if ("Spinner.previousButton".equals(c.getName())) {
      ((JButton) c).setToolTipText("getName: prev prev");
    } else if (c instanceof Container) {
      searchSpinnerButtons((Container) c);
    }
  }
}