Validate wallet address

AddressValidator.java

  public static boolean checksumAddress(String ethereumAddress) {
        // to fetch the part after 0x
        String subAddr = ethereumAddress.substring(2);
        // Make it to original lower case address
        String subAddrLower = subAddr.toLowerCase();
        // Create a SHA3256 hash (Keccak-256)
        SHA3.DigestSHA3 digestSHA3 = new SHA3.Digest256();
        digestSHA3.update(subAddrLower.getBytes());
        String digestMessage = Hex.toHexString(digestSHA3.digest());
        /*
         * Check each letter is upper case or not if it is upper case then the
         * corresponding binary position of the hashed address should be 1 i.e the
         * message digest letter should be getter than 7 as 7 is the last Hex digit
         * which starts with 0 in binary rest of all 8 to f starts with 1 (i.e 7: 0111, 8: 1000)
         */
        for (short i = 0; i < subAddr.length(); i++) {
            if (subAddr.charAt(i) >= 65 && subAddr.charAt(i) <= 91) {
                String ss = Character.toString(digestMessage.charAt(i));
                if (!(Integer.parseInt(ss, 16) > 7)) {
                    return false;
                }
            }
        }
        return true;

    }