如何使用Web3J生成私钥和地址，而不是创建密钥存储JSON文件？

private static JSONObject process(String seed){ JSONObject processJson = new JSONObject();

 try {
    ECKeyPair ecKeyPair = Keys.createEcKeyPair();
    BigInteger privateKeyInDec = ecKeyPair.getPrivateKey();

    String sPrivatekeyInHex = privateKeyInDec.toString(16);

    WalletFile aWallet = Wallet.createLight(seed, ecKeyPair);
    String sAddress = aWallet.getAddress();


    processJson.put("address", "0x" + sAddress);
    processJson.put("privatekey", sPrivatekeyInHex);


} catch (CipherException e) {
    //
} catch (InvalidAlgorithmParameterException e) {
    //
} catch (NoSuchAlgorithmException e) {
    //
} catch (NoSuchProviderException e) {
    //
} 

return processJson;

}

main(){ // unit test String seed = UUID.randomUUID().toString(); JSONObject result = process(seed); // get a json containing private key and address }

private static JSONObject process(String seed){

     JSONObject processJson = new JSONObject();

     try {
        ECKeyPair ecKeyPair = Keys.createEcKeyPair();
        BigInteger privateKeyInDec = ecKeyPair.getPrivateKey();

        String sPrivatekeyInHex = privateKeyInDec.toString(16);

        WalletFile aWallet = Wallet.createLight(seed, ecKeyPair);
        String sAddress = aWallet.getAddress();


        processJson.put("address", "0x" + sAddress);
        processJson.put("privatekey", sPrivatekeyInHex);


    } catch (CipherException e) {
        //
    } catch (InvalidAlgorithmParameterException e) {
        //
    } catch (NoSuchAlgorithmException e) {
        //
    } catch (NoSuchProviderException e) {
        //
    } 

    return processJson;

}

main(){ // unit test String seed = UUID.randomUUID().toString(); JSONObject result = process(seed); // get a json containing private key and address }