Java calculation divisible by 3 to hundred using bigdecimal

Question

Here is my sample code which calculates the percentage of amounts, in the given example i am expecting the return to be 10 but its giving me 9.9. how do i round it up to 10?

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


public class Test {


    public static final int AMOUNT_SCALE = 2;
    public static final int PRECISION_SIX = 6;
    private static BigDecimal tmp = new BigDecimal("100");
    public static final BigDecimal ONE_HUNDRED = tmp.setScale(0, RoundingMode.DOWN);
    public static final MathContext MATH_CONTEXT = new MathContext(PRECISION_SIX, RoundingMode.HALF_UP);

    public  static void main(String [] args){
         System.out.println(multiplyTwoNumbersAndDivideByOneHundredAmount(new BigDecimal(30), new BigDecimal(33.33))); ;
    }

    public static BigDecimal multiplyTwoNumbersAndDivideByOneHundredAmount(BigDecimal firstNumber, BigDecimal secondNumber) {
        return (firstNumber.multiply(secondNumber)).divide(ONE_HUNDRED,MATH_CONTEXT).setScale(AMOUNT_SCALE,RoundingMode.DOWN);
    }
}

Take a look at the documentation for RoundingMode.DOWN, please. — rajah9, Dec 13 '16 at 14:53
Well you've *told* it to round down, explicitly... think about changing which `RoundingMode` you're using... — Jon Skeet, Dec 13 '16 at 14:54

score 1 · Accepted Answer · answered Dec 13 '16 at 14:55

1

.setScale(0, RoundingMode.HALF_UP);

Is what you're looking for.

answered Dec 13 '16 at 14:55

xenteros

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score 0 · Answer 2 · edited Dec 13 '16 at 15:05

0

Pass the result through a BigInteger object:

BigInteger bi = new BigInteger(tmp);

edited Dec 13 '16 at 15:05

xenteros

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91

answered Dec 13 '16 at 14:59

Ashish Patel

163
6

Java calculation divisible by 3 to hundred using bigdecimal

2 Answers2