LeetCode66. Más uno (aplicación Java)

import java.util.Arrays;
class Solution66 {
    public static void main(String[] args){
        int[] digits={9,8,7,6,5,4,3,2,1,0};
        System.out.println(Arrays.toString(plusOne(digits)));
    }
    public static int[] plusOne(int[] digits) {
        int carry=1;
        for(int i=digits.length-1;i>=0;i--){
            int num=digits[i]+carry;
            digits[i]=num%10;
            carry=num/10;
            if(carry==0){
                break;
            }
        }
        if(carry==1){   //只能说明数组当中肯定是全9
            int[] arr=new int[digits.length+1];
            arr[0]=1;
            return arr;
        }
        return digits;

       
    }
}