Java BigDecimal.ROUND_HALF EVEN number with 3 decimals (odd and even)

Question

Good evening:

I am having a problem rounding numbers with 3 or more decimals.

I have for example this number: 1544.565

And I am trying to round it to 1544.57

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I have tried:

• BigDecimal.ROUND_HALF_EVEN
• BigDecimal.ROUND_UP
• RoundingMode.HALF_EVEN
• RoundingMode.HALF_UP
• RoundingMode.CEILING
• RoundingMode.UP

And all of them gave me the same wrong result: 1544.56 I am trying to obtain 1544.57

Any solutions please?

Answer 1

Try ROUND_UP with scale 2:

BigDecimal bigDecimal = new BigDecimal("1544.565");
System.out.println(bigDecimal.setScale(2, BigDecimal.ROUND_UP)); // 1544.57

Answer 2

In JDK 1.8 you can use java.text.DecimalFormat for this

new DecimalFormat("0.00").format(1544.565)

OUTPUT

1544.57

Read the doc to identify more pattern characters.

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UPDATE 2 (answering this comment ):

You are using BigDecimal.ROUND_HALF_EVEN use BigDecimal.ROUND_HALF_UP instead.

Don't use BigDecimal.ROUND_UP , it always rounds up the number.

BigDecimal.ROUND_HALF_UP

Rounding mode to round towards "nearest neighbor" unless both neighbors are equidistant, in which case round up.
_{~Java doc~}

Example:

BigDecimal number = new BigDecimal("1544.565");
System.out.println(number.setScale(2, BigDecimal.ROUND_HALF_UP).toString());

Output

1544.57

Answer 3

Confirmed here ;

double a = 1544.565;
double rounded = Math.round(a * 100.0) / 100.0;
System.out.println(rounded);

Outputs 1544.57 .