java.text.DecimalFormat problems

Hi....i have this value in a resultset called ConceptsDataRes:

BASE_CALCULO=0.0001 and i wish to convert to string , so i use

String CantFormat ="###,##0.0#";
java.text.DecimalFormat dCantFormat = new
java.text.DecimalFormat(CantFormat);
dCantFormat.format(ConceptsDataRes.getDouble("BASE_CALCULO"));

but it shows me 0.0 ....whats the problem ?

also in the ame resultset i have the value

MONTO=299.00 and i wish to convert to string so i use

String CantFormat ="###,##0.00";
java.text.DecimalFormat dCantFormat = new
java.text.DecimalFormat(CantFormat);
dCantFormat.format(ConceptsDataRes.getDouble("MONTO"));

but it shows me 299.0 ....whats the problem ?

tks friends !!!