Plus One leetcode java

 1 public int[] plusOne(int[] digits) {
 2             int length;
 3             length = digits.length;
 4             for(int i = length-1; i>=0; i--){
 5                 if(digits[i]<9){
 6                     digits[i]++;
 7                     break;
 8                 }else{
 9                     digits[i]=0;
10                 }
11             }
12             
13             int[] newdigits;
14             if(digits[0]==0){
15                 newdigits = new int[digits.length+1];
16                 newdigits[0]=1;
17                 for(int i=1;i<newdigits.length;i++){
18                     newdigits[i]=digits[i-1];
19                 }
20             }else{
21                 newdigits = new int[digits.length];
22                 for(int i=0;i<digits.length;i++){
23                     newdigits[i]=digits[i];
24                 }
25             }
26              return newdigits;
27         }

 1       public int[] plusOne(int[] digits) {
 2             for(int i=digits.length-1;i>=0;i--){
 3                 digits[i] =1+digits[i];
 4                 
 5                 if(digits[i]==10)
 6                     digits[i]=0;
 7                 else
 8                     return digits;
 9             }
10 
11             //don‘t forget over flow case
12             int[] newdigit = new int[digits.length+1];
13             newdigit[0]=1;
14             for(int i=1;i<newdigit.length;i++){
15                 newdigit[i] = digits[i-1];
16             }
17             return newdigit;
18         }