Java add commas to numbers

String number = "1000500000.574";
double amount = Double.parseDouble(number);
DecimalFormat formatter = new DecimalFormat("#,###.00");
// the zeroes after the point are the number of digits shown after the period
// you can also switch point and commas and get for example 1.002,45
System.out.println(formatter.format(amount));
// this prints 1,000,500,000.57

Source: stackoverflow.com

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