Kotlin’s Sealed Interfaces: Smashing the Inheritance Wall

📰 Dev.to · Kavearhasi Viswanathan

Learn how Kotlin's sealed interfaces can help avoid null objects and improve code quality

intermediate Published 28 Sept 2025

Action Steps

Learn about sealed classes in Kotlin
Understand how sealed interfaces can enforce non-nullability
Apply sealed interfaces to your Kotlin projects to avoid junk-drawer null objects
Test and refine your code using sealed interfaces
Compare the benefits of sealed interfaces with traditional inheritance methods

Who Needs to Know This

Android developers and Kotlin enthusiasts can benefit from this knowledge to write more robust and maintainable code

Key Insight

💡 Sealed interfaces in Kotlin can help avoid null objects and improve code quality by enforcing non-nullability

Key Takeaways

Learn how Kotlin's sealed interfaces can help avoid null objects and improve code quality

In my last post, we saw how sealed class can shield us from junk-drawer null objects by enforcing...