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Format String in commas  RSS feed

 
Greenhorn
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How do I format a string with commas to display in curreny format?
Assume the incoming string is a big number. For example, "1234567901234567890123456"

I want result as "12,345,678,901,234,567,890,123,456"

The DecimalFormat in Java has a limitation to format a big number.

Thanks.
 
Ranch Hand
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...
Assume the incoming string is a big number.
...
The DecimalFormat in Java has a limitation to format a big number.



95% of problems are solved by clarifying your requirements. Let's filter out the things that are definitely not requirements. "incoming string is a big number" - that statement can never hold true. Is it a String? If yes, then it's a String, and never a number. This distinction is important. I'll assume that the answer to this question is "yes".

Now that you have a String, why are you using a DecimalFormat? What does a String have to do with a decimal number formatter? Nothing related to the problem that you are trying to solve. I'll leave the determination of the correct approach to solve your problem up to you - after all, my speculations at your requirements may not be correct.

To reiterate, here are the things that are definitely incorrect:
- You have a String, that is a big number"
- DecimalFormat has an issue with "big numbers" - an unsubstantiated conclusion drawn on a false basis of understanding.

Good luck.
 
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There's probably something much better than this, but here's a couple of options

 
It is sorta covered in the JavaRanch Style Guide.
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