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.

Solution:

1 public class Solution {2     public int lengthOfLastWord(String s) {3         s = s.trim();4         int index = s.length()-1;5         while (index>=0 && s.charAt(index)!=‘ ‘) 6             index--;7         return (s.length()-index-1);        8     }9 }

Leetcode-Length of Last Word