public static void main(String[] args) {
    
    BigInteger n = new BigInteger("9516311845790656153499716760847001433441357");
    BigInteger e = new BigInteger("65537");
    BigInteger d = new BigInteger("5617843187844953170308463622230283376298685");
    Charset c = Charsets.UTF_8;
    String plainText = "Rosetta Code";
    System.out.println("PlainText: " + plainText);
    byte[] bytes = plainText.getBytes();
    BigInteger plainNum = new BigInteger(bytes);
    System.out.println("As number: " + plainNum);
    BigInteger Bytes = new BigInteger(bytes);
    if (Bytes.compareTo(n) == 1) {
        System.out.println("Plaintext is too long");
        return;
    }
    BigInteger enc = plainNum.modPow(e, n);
    System.out.println("Encoded: " + enc);
    BigInteger dec = enc.modPow(d, n);
    System.out.println("Decoded: " + dec);
    String decText = new String(dec.toByteArray(), c);
    System.out.println("As text: " + decText);
}