java - no grouping separator char for DecimalFormat

Question

DecimalFormat uses ',' as the default grouping separator character.

What is the correct way to tell DecimalFormat that we don't want any grouping separator character? I currently use symbols.setGroupingSeparator(''), and it seems to work, but it looks ugly.

DecimalFormatSymbols symbols = new DecimalFormatSymbols();
symbols.setDecimalSeparator('.');
symbols.setGroupingSeparator('');

DecimalFormat df = new DecimalFormat();
df.setDecimalFormatSymbols(symbols);

ParsePosition pp = new ParsePosition(0);
Number result = df.parse("44,000.0", pp);   // this should fail, as I don't want any grouping separatator char.
if (pp.getIndex() != input.length())
   throw new Exception("invalid number: " + input, 0);

What is the correct way to tell DecimalFormat that we don't want any grouping separator char?

Answer 1

Turn off grouping by calling setGroupingUsed:

df.setGroupingUsed(false);