Leetcode 刷题：Q58 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) {
        //handle extreme conditions
        if(s==null || s.length()==0)
        return 0;
        
        int count=0;


        for(int i=s.length()-1;i>=0;i--){
                if(s.charAt(i) != ' ')
                count++;
                if(s.charAt(i) == ' ' && count != 0)
                return count;
        }
        return count;
    }
}