#{ Validar tipo de dato por columna }

http://www.coderanch.com/t/488016/GUI/java/JTable-set-column-data-type
http://allaboutbasic.com/2011/01/01/jtable-cell-validation-how-to-make-jtable-cell-allow-or-accept-only-integer-numeric-numberdata/
http://waltermilner.com/downloads/JavaSwing/UsingJTables.pdf