PurposeValidate if a number is an Armstrong Number.An Armstrong Number is a numbersuch that the sum of the cubes of its digits is equal to the number itself. For example, 371 is an Armstrong number since 33 + 73 + 13 = 371.StrategyCalculate the remainder and quotient of the candidate value.While the quotient is greater than 0 and the digit sum is not greater than the candidate value, calculate the new remainder, the new quotient, and add remainder raised by 3 to the digit sum.Implementationpublic class ArmstrongNumberValidatorImpl implements ArmstrongNumberValidator {    @Override    public boolean isArmstrong(final long candidate) {        if (candidate < 0) {            throw new IllegalArgumentException(candidate value must be non-negative);        }        long remainder = candidate % 10;        long quotient = candidate / 10;        long digitSum = Math.multiplyExact(Math.multiplyExact(remainder, remainder), remainder);        while (quotient > 0 && digitSum <= candidate) {            remainder = quotient % 10;            quotient = quotient / 10;            digitSum += Math.multiplyExact(Math.multiplyExact(remainder, remainder), remainder);        }        return (0 == quotient && digitSum == candidate);    }}
Armstrong Number Validator
java;programming challenge