Question

I have a string that shows a number with a comma separator like this:

DecimalFormat formatter = new DecimalFormat("#,###.000000");
String toDouble=formatter.format(amount);

Now I want to remove commas in BO class to do arithmetic operations. I used this format:

StrCash_price_deal = StrCash_price_deal.replace(",", "");
double d = Double.valueOf(StrCash_price_deal.trim()).doubleValue();

but it changes the value to zero!!!
my technology is struts2

Answer 1

You have a DecimalFormat which you’re using to format the value. Use the same object to parse the value, instead of using Double.valueOf.

Additionally:

• Try to avoid formatting/parsing cycles where possible. Keep the value as a number for almost your whole code base, only formatting for presentation and only parsing for user input
• Don’t use double for currency values; use BigDecimal which will reduce the surprises you get when it comes to “inaccurate” arithmetic
• Follow Java naming conventions wherever possible. StrCash_price_deal is horrible in both casing and underscore-ness