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) {
        s=s.trim();
        String[] strArray=s.split(" ");
        int len=strArray.length;
        String last=strArray[len-1];
        int lastLen=last.length();
        return lastLen;
    }
}