### Question:
Keys { public static ECKeyPair createEcKeyPair() throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, NoSuchProviderException { KeyPair keyPair = createSecp256k1KeyPair(); return ECKeyPair.create(keyPair); } private  Keys(); static ECKeyPair createEcKeyPair(); static String getAddress(ECKeyPair ecKeyPair); static String getAddress(BigInteger publicKey); static String getAddress(String publicKey); static byte[] getAddress(byte[] publicKey); static byte[] serialize(ECKeyPair ecKeyPair); static ECKeyPair deserialize(byte[] input); static boolean verifyAddress(String address); static boolean verifyPrivateKey(String privateKey); static final int ADDRESS_SIZE; static final int ADDRESS_LENGTH_IN_HEX; static final int PRIVATE_KEY_LENGTH_IN_HEX; }### Answer:
@Test public void testCreateEcKeyPair() throws Exception { ECKeyPair ecKeyPair = Keys.createEcKeyPair(); assertThat(ecKeyPair.getPublicKey().signum(), is(1)); assertThat(ecKeyPair.getPrivateKey().signum(), is(1)); }