58. length of last word

Input: "Hello World"
Output: 5

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

public int lengthOfLastWord(String s) {
    return s.trim().length()-s.trim().lastIndexOf(" ")-1;
}