Length of Last Word

public class Solution {
    /**
     * @param s A string
     * @return the length of last word
     */
    public static int lengthOfLastWord(String s) {
        if (s == null || s.isEmpty()){
            return 0;
        }
        s = s.trim();
        int len = s.length();
        int index = 0;
        for (int i = len - 1; i > 0; i--){
            if (Character.isSpaceChar(s.charAt(i))){
                index = i + 1;
                break;
            }
        }
        return len - index;
    }
}