Add commas (grouping separator) to number without modifying decimals?

Question

I\'m trying to format a string to add commas between 3 digit groups

EG:

1200.20 >> 1,200.20
15000   >> 15,000

I\'m tryi

Answer 1

The most simple solution

Why don't you use the comma , flag with printf.

System.out.printf( "%,d\n", 58625 );// the d to accept decimal integer
System.out.printf( "%,.2f", 12345678.9 );// the f to accept folouting point and 2 to take only 2 digits  

The output will be

58,625
12,345,678.90

And the good news: The actual generated separator used is specific to the user’s locale