BigDecimal scaling issue in Java

Question

Currently I have a Proportionate Value of 0.588235294 with that I need to multiply it and sum of total value must be 100. With Excel the calculation is working as perfect but in same when i tried with help of BigDecmial api there is a point variations.

The below screenshot is the output from Excel .

In Java

public class CalculateRates {

    public static void main(String[] args) {

        BigDecimal f1 = new BigDecimal(65);
        BigDecimal f2 = new BigDecimal(45);
        BigDecimal f3 = new BigDecimal(35);
        BigDecimal f4 = new BigDecimal(25);

        BigDecimal totalRate = f1.add(f2).add(f3).add(f4);

        System.out.println("Total Value : " + totalRate);

        BigDecimal proportionatedValue = new BigDecimal(100.00).divide(totalRate, 9, BigDecimal.ROUND_DOWN);

        System.out.println("ProportionatedValue : "+proportionatedValue);

        BigDecimal f11 = f1.multiply(proportionatedValue).setScale(8);
        BigDecimal f12 = f2.multiply(proportionatedValue).setScale(8);
        BigDecimal f13 = f3.multiply(proportionatedValue).setScale(8);
        BigDecimal f14 = f4.multiply(proportionatedValue).setScale(8);


        System.out.println(f11 + ":: " + f12 + ":: " + f13 + ":: " + f14 );

        System.out.println("Total : "+f11.add(f12).add(f13).add(f14));

    }

}

The output of first and second value is different by one digit at the last

What causing this issue? and How we can approach it for a common solution.

Answer 1

您正在使用BigDecimal.ROUND_DOWN ，如果您确实希望具有与Excel工作表中完全相同的值，则应使用ROUND_UP 。