Java Client is not good to use as client library

[hungntit]

String bodyValue = "{"messages":" +
"[{"content":"My first message", " +
""destination_number":"YOUR_MOBILE_NUMBER"" +
"}]}";

Who want to create an json manually? I thinks we need to create an object Message, and just:
Messages messages = Messages.builder()
.addMessage(
Message.builder().withContent("My First Message")
.withDestinationNumber("+xxxxxx").build())
.build()

MessageClient client = MessageClient(apikey, secretkey);

client.send(messages)
Do you think it more simple?