LeetCode----66. Plus One(Java)

 package plusOne66;
 /*
     Given a non-negative number represented as an array of digits, plus one to the number.
     The digits are stored such that the most significant digit is at the head of the list.
  */
 public class Solution {
 
     public static int[] plusOne(int[] digits) {
         int index=digits.length-1;
         digits[index]=digits[index]+1;
         while(digits[index]>=10&&index>0){
             digits[index]=digits[index]%10;
             index--;
             digits[index]=digits[index]+1;
         }
         if (digits[0]>9)
         {
             digits[0]=digits[0]%10;
             int[] result=new int[digits.length+1];
             result[0]=1;
             for (int i=0;i<digits.length;i++){
                 result[i+1]=digits[i];
             }
             return result;
         }
         return digits;
     }
     public static void main(String[] args) {
         // TODO Auto-generated method stub
 
         int[] digits={9,9,9,9};
         //System.out.println(plusOne(digits).toString());
     }
 
 }