JListのスクロールをセルユニット単位にするかを変更する

String key = "List.lockToPositionOnScroll";
// UIManager.put(key, Boolean.FALSE);

DefaultListModel<String> model = new DefaultListModel<>();
IntStream.range(0, 1000)
         .mapToObj(Objects::toString)
         .forEach(model::addElement);
JList<String> list = new JList<String>(model) {
  @Override public void updateUI() {
    setCellRenderer(null);
    super.updateUI();
    ListCellRenderer<? super String> renderer = getCellRenderer();
    setCellRenderer((list, value, index, isSelected, cellHasFocus) -> {
      Component c = renderer.getListCellRendererComponent(
          list, value, index, isSelected, cellHasFocus);
      if (isSelected) {
        c.setForeground(list.getSelectionForeground());
        c.setBackground(list.getSelectionBackground());
      } else {
        c.setForeground(list.getForeground());
        c.setBackground(index % 2 == 0
            ? EVEN_BACKGROUND
            : list.getBackground());
      }
      return c;
    });
  }
};
list.setFixedCellHeight(64);

JCheckBox check = new JCheckBox(key, UIManager.getBoolean(key));
check.addActionListener(e -> UIManager.put(key, check.isSelected()));