// thread-safe
static void fillListWithStrings(JList list, Cl<S> contents) {
  if (list == null) ret;
  final new DefaultListModel model;
  if (contents != null) for (S s : contents)
    model.addElement(empty(s) ? " " : s);
  swing { list.setModel(model); }
}

static void fillListWithStrings(final JList list, S[] contents) {
  fillListWithStrings(list, asList(contents));
}