Rounding mode from java Math package for .555 not works

Question

How about my problem is the following, I am using the rounding mode to round and truncate some quantities but none of the enumerations works for the business rule that my client needs, I give as an example the following:

new BigDecimal(5.551).setScale(2, RoundingMode.[ENUM]) <-- DEberia regresar 5.55 OK
new BigDecimal(5.554).setScale(2, RoundingMode.[ENUM]) <-- DEberia regresar 5.55 OK
new BigDecimal(5.555).setScale(2, RoundingMode.[ENUM]) <-- DEberia regresar 5.55 It should be 5.56 
new BigDecimal(5.559).setScale(2, RoundingMode.[ENUM]) <-- DEberia regresar 5.56 OK

I had used HALF_DOWN which was the closest one but I came across this case in which I have pure fives and so it didn't work anymore.

Answer 1

Do it as follows:

import java.math.BigDecimal;
import java.math.RoundingMode;

public class Main {
    public static void main(String[] args) {

        System.out.println(new BigDecimal(String.valueOf(5.551)).setScale(2, RoundingMode.HALF_UP));
        System.out.println(new BigDecimal(String.valueOf(5.554)).setScale(2, RoundingMode.HALF_UP));
        System.out.println(new BigDecimal(String.valueOf(5.555)).setScale(2, RoundingMode.HALF_UP));
        System.out.println(new BigDecimal(String.valueOf(5.559)).setScale(2, RoundingMode.HALF_UP));
    }
}

Output:

5.55
5.55
5.56
5.56