Designing Hierarchies with Kotlin Interfaces and Abstract Classes

To write clean, maintainable, and scalable applications, you must master the core principles of object-oriented design. Understanding how and when to use interfaces versus abstract classes in Kotlin is crucial for structuring robust codebases. This text-only course guides you through the foundational concepts of Kotlin's type system, showing you how to design flexible object hierarchies. You will learn how Kotlin handles polymorphism, how its approach to interfaces differs from Java, and how to leverage modern language features to write elegant code. You will learn to: 1. Understand the fundamental differences between interfaces and abstract classes in Kotlin. 2. Implement stateful and stateless properties within Kotlin interfaces. 3. Apply class delegation to reuse interface implementations without inheritance. 4. Design robust domain models using sealed classes and sealed interfaces for modern type safety. 5. Compare Kotlin's modern object-oriented model with traditional Java implementations. 6. Practice structuring clean hierarchies through written code examples and design exercises. The course begins with basic definitions and core object-oriented principles before moving into hands-on code structures, interface delegation, and modern sealed hierarchies. This course is designed for beginner to intermediate developers who have a basic grasp of Kotlin syntax and want to master object-oriented architecture. Start reading today to elevate your software design skills in Kotlin.