Question

float a= (float) 1846.4;

NumberFormat df = DecimalFormat.getInstance();
df.setMinimumFractionDigits(2);
df.setMaximumFractionDigits(2);

float b = Float.parseFloat( df.format(a));

What would be the best way to set decimal places for a float (I just want to set 2 decimal places of a float value which can be 2013.43452 or 2392.2) ? Now I am getting exception like Exception in thread "main" java.lang.NumberFormatException: For input string: "1,846.40".

Answer 1

I think the direct problem causing the NFE is the thousand separators in the string, not the number of decimal places. You have both a ',' and a '.' in the string, and parseFloat doesn’t like that.

Note, however, that you can’t fix the number of decimal places in a float value – it is entirely a formatting issue. Specifically, trailing 0‘s have no significance in floating point values, thus will not be shown by default. You need to format the value according to your wishes at the point of output (when converting it into a displayable String e.g. by using DecimalFormat as you did above).