leetcode--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.

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1. public class Solution {  
2.     public int lengthOfLastWord(String s) {  
3.         int count = 0;  
4.         boolean tail = true;  
5.         for(int i=s.length()-1;i>=0;i--){  
6.             if(s.charAt(i)==' '){  
7.                 if(!tail) break;  
8.             }else{  
9.                 count++;  
10.                 tail = false;  
11.             }             
12.         }  
13.         return count;  
14.     }  
15. }  

原文链接http://blog.youkuaiyun.com/crazy__chen/article/details/46008555