Leetcode 题目解析之 Length of Last Word

    public int lengthOfLastWord(String s) {
        if (s == null || s.length() == 0) {
            return 0;
        }
        int len = 0;
        int i = s.length() - 1;
        while (i >= 0 && s.charAt(i) == ' ') {
            i--;
        }
        while (i >= 0 && s.charAt(i) != ' ') {
            len++;
            i--;
        }
        return len;
    }