simpleValueTransfer.java

@Test
public void VTTest() throws InvalidAlgorithmParameterException, NoSuchAlgorithmException, NoSuchProviderException, IOException {
    BigInteger privKey = Keys.createEcKeyPair().getPrivateKey();
    KlayCredentials credential = KlayCredentials.create(privKey.toString(16)); // newly created credential


    KlayTransactionReceipt.TransactionReceipt receipt;

    receipt = transfer(senderCredential, credential, Convert.toPeb("0.5", Convert.Unit.KLAY).toBigInteger());
    Assert.assertNotNull(receipt);

    receipt = transfer(credential, recipientCredential, Convert.toPeb("0.3", Convert.Unit.KLAY).toBigInteger());
    Assert.assertNotNull(receipt);
}

private KlayTransactionReceipt.TransactionReceipt transfer(KlayCredentials from, KlayCredentials to, BigInteger value) throws IOException {
    log.info("transfer {} KLAY [{} -> {}]", value.toString(), from.getAddress(), to.getAddress());

    BigInteger nonce = caver.klay().getTransactionCount(from.getAddress(), BLK_PARAM).send().getValue();
    TxTypeValueTransfer tx = TxTypeValueTransfer.createTransaction(
            nonce,
            GAS_PRICE,
            GAS_LIMIT,
            to.getAddress(),
            value,
            from.getAddress()
    );

    TransactionManager manager = new TransactionManager.Builder(caver, from)
            .setTransactionReceiptProcessor(new PollingTransactionReceiptProcessor(caver, 1000, 10))
            .setChaindId(CHAIN_ID)
            .build();

    KlayTransactionReceipt.TransactionReceipt receipt = manager.executeTransaction(tx);
    log.info("{}", receipt.toString());
    return receipt;
}