Conclusion

In this lesson, you’ve scratched the surface of interfaces, which enable you to model behavior that isn’t connected to inheritance.

You learned:

• That interfaces offer a flexible way to define blueprints for methods, properties, and requirements, allowing your code to adapt and be more reusable.
• About abstract classes and how you can define methods and properties that child classes should adopt. However, a class can only extend one class since Kotlin does not support multiple inheritance.
• That, unlike traditional inheritance, classes can adopt multiple interfaces as necessary.
• About the Kotlin Standard Library, which provides us interfaces such as Comparable, which you used in this lesson.
• You can define your own interfaces to create reusable code that defines the data or functionality to adopt.
• That properties in abstract classes can maintain state while properties in interfaces can’t.