Lothar Schulz
Java Sealed Classes vs. Kotlin Sealed Classes #Slideless
#1about 2 minutes
Introducing sealed classes in Java 17
Sealed classes restrict which other classes may extend them, giving developers more control over inheritance hierarchies.
#2about 1 minute
Understanding Kotlin sealed classes as super enums
Kotlin's sealed classes act like enums that can hold state, making them powerful containers for different types of data.
#3about 13 minutes
Refactoring Kotlin code to eliminate nulls with sealed classes
A live coding demo shows how to replace nullable return types with a sealed class to explicitly handle success and failure cases.
#4about 11 minutes
Implementing sealed classes in Java to handle API results
This live coding example demonstrates creating a Java sealed class with final subclasses to manage success and failure states from an API call.
#5about 3 minutes
Using Java sealed interfaces with records for conciseness
Code is refactored from sealed classes to sealed interfaces implemented by records, significantly reducing boilerplate code.
#6about 3 minutes
Applying pattern matching in Java with switch expressions
The if-instanceof chain is replaced with a modern switch expression for exhaustive and more readable pattern matching.
#7about 3 minutes
Conclusion on Java vs Kotlin sealed class parity
Sealed classes in both Java and Kotlin are now functionally on par, so language choice can be based on other factors.
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