58. Length of Last Word java solutions

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         if(s == null || s.length() == 0) return 0;
4         String a = s.trim();
5         if(a.length() == 0) return 0;
6         String[] tmp = s.split(" ");
7         return tmp[tmp.length-1].length();
8     }
9 }