Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example,
Given s = "Hello World",
return 5.

 1 public class Solution {
 2     public int lengthOfLastWord(String s) {
 3         if(s == null || s == " ")
 4             return 0;
 5         
 6         char[] arr = s.trim().toLowerCase().toCharArray();
 7         int count = 0;
 8         for(int i = 0; i < arr.length; i++){
 9             char c = arr[i];
10             if((c >= 'a' && c <= 'z')){
11                 count++;
12             }else{
13                 count = 0;
14             }
15         }
16         return count;
17     }
18 }

 1 public class Solution {
 2     public int lengthOfLastWord(String s) {
 3         if(s == null || s == " ")
 4             return 0;
 5         
 6         String[] arr = s.split(" ");
 7         
 8         if(arr.length != 0)
 9             return arr[arr.length -1].length();
10         else 
11             return 0;
12     }
13 }