Java format BigDecimal numbers with comma and 2 decimal place

Question

I want to format BigDecimal Numbers with comma and 2 decimal points. e.g.

Amount is: 5.0001 and formatted to: 5.00
Amount is: 999999999.999999 and formatted to: 999,999,999.99
Amount is: 1000.4999 and formatted to: 1,000.49
Amount is: 9999.089 and formatted to: 9,999.08
Amount is: 0.19999 and formatted to: 0.19
Amount is: 123456.99999999 and formatted to: 123,456.99

Answer 1

You should use DecimalFormat:

val df: DecimalFormat = DecimalFormat("#,##0.000")
df.decimalFormatSymbols = DecimalFormatSymbols(Locale.getDefault())
df.format(BigDecimal(123456,78)); //will output 123.456,78 - depending on Locale

Answer 2

This should be enough to get the results.

String.format("%,.2f", amount.setScale(2, RoundingMode.DOWN));