Kotlin Tutorial
Kotlin Sealed Class (Examples, Uses, How to Use)
Table of Contents
- Introduction
- What is Sealed Class in Kotlin?
- Kotlin Sealed Class Syntax
- Kotlin Sealed Class Example
- Uses of Sealed Classes in Kotlin
- Important Things to Know About Sealed Class in Kotlin
- How to Use Sealed Class in Kotlin?
- Kotlin Sealed Class With When Expression
- Kotlin Sealed Class vs Data Class (Differences)
- Kotlin Sealed Class vs Abstract Class (Difference)
- Kotlin Full Course Video for Beginners [FREE]
Kotlin Full Course Video for Beginners [FREE]
Kotlin Sealed Class FAQs
Sealed classes are used to represent a restricted set of types, typically in scenarios where you want to handle a finite number of possibilities in a type-safe manner. They are useful for modeling states, outcomes, or data with a known set of variants.
Yes, sealed classes can have constructors, and each sealed subclass can have its own constructor with different parameters. This allows for modeling different cases with specific data.
Yes, when using a when expression with a sealed class, you are required to handle all possible subclasses. This ensures exhaustive handling and helps prevent runtime errors due to missing cases.
Yes, you can have properties in sealed classes. Each subclass can have its own properties, allowing you to model different data for each case.
Yes, sealed classes are typically designed to be immutable by declaring properties as val (read-only) by default. However, you can make properties mutable by using var if needed.
Yes, you can create instances of sealed classes, just like regular classes. However, you need to use one of the sealed subclass constructors to create instances.
No, sealed classes can only be extended by subclasses defined within the same file or compilation unit where the sealed class is declared.
