how to remove a comma in a string

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

Possible duplicate : http://stackoverflow.com/questions/11981361/comma-separator-in-a-string-variable — KV Prajapati, Aug 16 '12 at 08:17
In your last [question](http://stackoverflow.com/questions/11981361/comma-separator-in-a-string-variable) you wanted to add commas. Now you want to delete them. Maybe you should describe what you are actually trying to achieve... — maba, Aug 16 '12 at 08:18
yes my customer wants to see number in comma separation but I have to do arithmetic operations on it, so I have to drop commas — AFF, Aug 16 '12 at 08:20

score 5 · Accepted Answer · answered Aug 16 '12 at 08:21

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

1 Answers1