JTable column Class  (getColumnClass)

I create table model extended it from AbstractTableModel.
by overwriting getColumnClass in model.
     @SuppressWarnings("unchecked")
     public Class getColumnClass(int c) {
          return getValueAt(0, c).getClass();
     }but I have problem with TableRowSorter. I implement my own Comparator interface for TableRowSorter, Which
can compare column with Number and String or Boolean and String etc. ( String("") in cell with Number sense cells NULL value )
I passing my comparator to
TableRowSorter.setComparator(column, comparator);I have some number of comprators for String,Number and Boolean comparision.
If i call sorting of column with Number values
and columns first cell (0,0) contain String("") ( NULL value )
my code logic automatically set
TableRowSorter.setComparator(0, new StringComparator());but really column contains Number values with one String("") value.
right code must be
TableRowSorter.setComparator(0, new NumberComparator());how to determine column Class in right way???

thanks everyone !!! I find solution :) I must create global Comparator for Object type and merge all different type comparators in to one ObjectComparator

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