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.

java用trim(),split()来分割即可。

    public int lengthOfLastWord(String s) {        if(s.length()==0){            return 0;        }        String[] A = s.trim().split(" ");        return A[A.length -1].length();    }