// params: column index, Comparator, column index, Comparator, ...
svoid rowSorter_setComparators(JTable table, fO... params) {
  please include function setTableModel.
  setTableModel_fixSorter.put(table, voidfunc(JTable table, RowSorter sorter) {
    if (sorter cast TableRowSorter) {
      for (Pair<Int, Comparator> p : paramsToPairs(params))
        sorter.setComparator(p.a, p.b());
    }
  });
}