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

You can also try something like

DecimalFormat df = new DecimalFormat("#,###.00");

System.out.println(df.format(1200.20));
System.out.println(df.format(15000));
System.out.println(df.format(123456789.99));

1,200.20
15,000.00
123,456,789.99