Decimal separator in NumberFormat

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The helper class DecimalFomatSymbols is what you are looking for:

DecimalFormat format = (DecimalFormat) DecimalFormat.getInstance();
DecimalFormatSymbols symbols = format.getDecimalFormatSymbols();
char sep=symbols.getDecimalSeparator();

To set you symbols as needed:

//create a new instance
DecimalFormatSymbols custom=new DecimalFormatSymbols();
custom.setDecimalSeparator(',');
format.setDecimalFormatSymbols(custom);

EDIT: this answer is only valid for DecimalFormat, and not for NumberFormat as required in the question. Anyway, as it may help the author, I’ll let it here.

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