Java Fundamentals - From Left to The Right

import java.math.BigInteger;
import java.util.Scanner;

public class FromLeftToTheRight {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int n = Integer.parseInt(scanner.nextLine());

        for (int i = 0; i < n; i++) {
            BigInteger leftNum = scanner.nextBigInteger();
            BigInteger rightNum = scanner.nextBigInteger();

            BigInteger num;
            if (leftNum.compareTo(rightNum) > 0) {
                num = leftNum;
            } else {
                num = rightNum;
            }

            int totalDigitSum = 0;

            num = num.abs();

            while(num.intValue() != 0){
                totalDigitSum += num.remainder(BigInteger.valueOf(10)).intValue();
                num = num.divide(BigInteger.valueOf(10));
            }

            System.out.println(totalDigitSum);
        }
    }
}