BigDecimal money format chop off to 2 decimal

[Adam Lim]

hi. i wanna to money format with 2 decimal.
if no decimal, just append . 2 zero.
if 3 or more decimal. just chop off instead of rounding up.

output :-
//1727 => 1727.00
//1727.1 => 1727.10
//1727.23 => 1727.23
//1727.236 => 1727.23
//1727.231 => 1727.23
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import java.math.BigDecimal;

public class TestBigDecimal {

public static void main(String[] args) {

//1727 => 1727.00
//1727.1 => 1727.10
//1727.23 => 1727.23
//1727.236 => 1727.23
//1727.231 => 1727.23

double money = 1727.1;

System.out.println(new BigDecimal(money).setScale(2, BigDecimal.ROUND_UNNECESSARY));
}
}

Exception in thread "main" java.lang.ArithmeticException: Rounding necessary


please advise
adam

[Ulf Dittmer]

It's ROUND_DOWN you want in this case.

For formatting you can use the DecimalFormat.format method. That class's setMinimumFractionDigits and setMaximumFractionDigits methods control the number of fractional digits.

double money = 1727.1;
...new BigDecimal(money)

Don't use float or double where money is involved. " new BigDecimal("1727.1") " is the proper constructor for this.