Introduction

Welcome to lesson four! You know the basics of defining and using classes in Kotlin, so now you’ll dive into a more advanced direction of classes. In this next lesson, you’ll learn about:

• Class inheritance
• Polymorphism and its benefits
• The super keyword
• Running hierarchy checks

By the end, you’ll be able to:

• Describe how classes inherit from other classes.
• Identify the purpose of the super keyword.
• Know what polymorphism looks like.
• Define a subclass.

If you’re ready, it’s time to begin.