In this example, the Main class is the entry point of the application. It creates a DatabaseUserRepository adapter and a UserService application service. The UserService uses the UserRepository port to interact with the outside world.
Hexagonal architecture, also known as ports and adapters architecture, is a design pattern that aims to separate the core business logic of an application from its infrastructure and external dependencies. This approach enables developers to write more maintainable, flexible, and testable code. In this essay, we will explore the principles of hexagonal architecture and provide a practical example of implementing it with Java. In this example, the Main class is the