@Override
    public Comparator getComparator() {
      return (o1, o2) -> {
        String s1 = SorterUtil.getStringPresentation(o1);
        String s2 = SorterUtil.getStringPresentation(o2);
        return s1.compareToIgnoreCase(s2);
      };
    }
@Override
    public Comparator getComparator()