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.

public class Solution {    public int lengthOfLastWord(String s) {        if (s == null || s.length() == 0) {            return 0;        }                int size = s.length();        int i = size - 1;        while (i >= 0 && s.charAt(i) == ' ') i--;        int count = 0;        while (i >= 0 && s.charAt(i) != ' ') {            count++;            i--;        }                return count;    }}