public String toString() {StringBuilder sb = new StringBuilder(64);CellReference crA = new CellReference(_firstRowIndex, _firstColumnIndex, false, false);CellReference crB = new CellReference(_lastRowIndex, _lastColumnIndex, false, false);sb.append(getClass().getName());sb.append(" [").append(crA.formatAsString()).append(':').append(crB.formatAsString()).append("]");return sb.toString();}