Creating Software with Modern Diagramming Techniques

Define Interfaces

You may have noticed that all of the classes depend on concrete implementations. This isn’t a book on writing clean code, so I don’t want to go into too much detail, but relying on concrete classes leads to tight coupling between classes. This ultimately makes the code harder to work with, as a change in one class often directly impacts the class it depends on.

A common approach to breaking coupling between classes is to use and rely on interfaces instead of concrete implementations. For those not familiar, interfaces can be seen as defining a contract. They contain no logic; they just define the methods that a class must implement to fulfil that contract. At a code level, that means classes can depend on an interface rather ...