How to design using java?

Question

Hi, how to design a software and how it connect with cloud?

Answer 1

If your application is quite simple, a main class and some specific class (business objects) can be enough. But if you want to develop a large software, you can use the design pattern (for the implementation in java, you can see this nice post : https://stackoverflow.com/questions/1673841/examples-of-gof-design-patterns-in-javas-core-libraries).
For the "cloud", it's an other question, you should use specific API (Jdbc, hibernate, sockets...)