public String encode(String s) {
        String result = null;
        for (int i = 0; i < s.length(); i++) {
            int b = s.charAt(i);
            for (int j : keyValues) {
                b += j + keyValues.length;
                System.out.println(b);
            }
            result = (result == null ? String.valueOf((char) b) : result
                    + String.valueOf((char) b));
        }
        return result;
    }