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Java Solution for LeetCode algorithm problems, continually updating

There is a newer version: 1.24

package g0401_0500.s0415_add_strings;

// #Easy #String #Math #Simulation

public class Solution {
    public String addStrings(String num1, String num2) {
        StringBuilder result = new StringBuilder();
        int carry = 0;
        for (int i = num1.length() - 1, j = num2.length() - 1;
                i >= 0 || j >= 0 || carry != 0;
                i--, j--) {
            int sum = carry;
            if (i >= 0) {
                sum += Character.digit(num1.charAt(i), 10);
            }
            if (j >= 0) {
                sum += Character.digit(num2.charAt(j), 10);
            }
            carry = sum / 10;
            result.append(sum % 10);
        }
        return result.reverse().toString();
    }
}