javabigdecimaldecimalformat

Round to 2 decimal places in Java using DecimalFormat

I am using DecimalFormat to round a value(in Double type) to 2 decimal places

var decimalFormat = new DecimalFormat("0.0");
decimalFormat.setRoundingMode(RoundingMode.HALF_UP);
decimalFormat.setMaximumFractionDigits(2);
return decimalFormat.format(value);

When value = 50.275 => result is 50.27 As expected, the result should be 50.28 I have tried using RoundingMode.HALF_EVEN as well but it didn't work either.

Solution

  • 50.275 cannot be represented exactly and the actual floating point value is something like 50.274999. Thus it is rounded down.

    If you have 50.275 as a String, you can create a BigDecimal out of it and format that.

    new BigDecimal("50.275").setScale(2, RoundingMode.HALF_UP).toPlainString();
// 50.28