sealed-class Questions
2
Solved
If I declare following sealed hierarchy
package a;
import b.B;
public sealed interface A permits B {
}
package b;
import a.A;
public record B() implements A {
}
without using modules (no mo...
Dextrose asked 23/7, 2021 at 8:26
1
How to encode Algebraic Data Types current in Dart?
Algebraic data types are also known as:
Sealed Classes in Kotlin
Algebraic Data Types in Scala
Enums in Rust
Enums with Associated Values in Swi...
Churchyard asked 22/3, 2021 at 8:44
2
Non exhaustive when statements on sealed class/interface will be prohibited in Kotlin 1.7.
I have a sealed class State and it's children:
sealed class State {
object Initializing : State()
object...
Acronym asked 25/5, 2022 at 15:0
10
Solved
Today, I updated my Java version from 16 to 17, and I found that sealed classes is a new feature in it. I think it can be declared like this:
public sealed class Main permits AClass, AnotherClass {...
Extraterrestrial asked 17/9, 2021 at 6:18
2
Solved
In our most recent app release we see a handful kotlin.NoWhenBranchMatchedExceptions reported to Fabric/Crashlytics.
This is the code snippet in question:
private lateinit var welcome: Welcome
/...
Unwarranted asked 21/6, 2018 at 6:36
3
I have created a sealed class for the json field Value under CustomAttribute data class. This field can return String or Array of Strings.
How can we deserialize this sealed class from json?
dat...
Inattentive asked 17/2, 2020 at 10:8
1
When I want to release my app get this error: com.android.tools.r8.internal.jb: Sealed classes are not supported as program classes when generating class files
Android Studio: Flamingo 2022.2.1 (a...
Moist asked 19/4, 2023 at 13:59
1
Solved
I have a sealed class for FailureOrSuccess, with subclasses for Success, and Failure.ch
The Failure subclass is also a sealed class, with multiple subclasses for the different types of failure.
I w...
Carton asked 14/3, 2023 at 13:20
3
Solved
I have the following sealed interface (Java 15):
public sealed interface Animal permits Cat, Duck {
String makeSound();
}
This interface is implemented by 2 classes:
public final class Cat imple...
Simmers asked 19/9, 2020 at 18:34
3
Solved
I'd like to create a color object based on an Int. I can achieve the same result using sealed class and enum and was wondering if one is better than the other.
Using sealed class:
sealed class Se...
Anglocatholic asked 8/3, 2018 at 8:57
2
Solved
I'm new with Kotlin. I'm reading a book and a sealed class is displayed there as an "extension" of Enum. I can't see the similarity between them. The way I see the things, Sealed class is...
Transmarine asked 24/10, 2020 at 13:26
2
Solved
With Kotlin 1.5 was introduce the sealed interface. Even that I know the difference between classes and interfaces, I'm not clear what are the best practices and beneficies of using sealed interfac...
Spiteful asked 8/9, 2021 at 9:22
2
Solved
I want to save in my Room database an object where one of the variables can either be of on type or another. I thought a sealed class would make sense, so I took this approach:
sealed class Blueto...
Lowspirited asked 30/3, 2020 at 10:37
4
I have a sealed-class like this
sealed class LoadState {
class Loading : LoadState()
class Success : LoadState()
class Fail : LoadState()
}
I use sealed-class with LiveData, it works
open class...
Kocher asked 19/8, 2021 at 9:42
2
Not sure if it is possible yet but for the life of me I cannot figure out how to serialize this.
sealed class ServiceResult<out T : Any> {
data class Success<out T : Any>(val data: T) ...
Lumpish asked 13/11, 2020 at 19:15
7
Solved
Sealed classes and sealed interfaces were a preview feature in Java 15, with a second preview in Java 16, and now proposed delivery in Java 17.
They have provided classic examples like Shape -> ...
Undoing asked 3/10, 2020 at 19:16
1
Solved
For the first time in a LTS version of Java (Java 17) we have the sealed keyword that, in a nutshell, give us the possibility to restrict the hierarchy:
public abstract sealed class Person
permits...
Buffy asked 4/12, 2021 at 19:7
4
Solved
I don't really understand why there is a non-sealed keyword in JEP-360 / Java 15. For me, an extension of a sealed-class should only be final or a sealed-class itself.
Providing the non-sealed keyw...
Ragland asked 12/9, 2020 at 12:3
3
Solved
I have a sealed class like so:
sealed class SealedClass {
object Object1 : SealedClass()
object Object2 : SealedClass()
object Object3 : SealedClass()
data class DataClass(val sealedClass: ...
Tetanic asked 8/8, 2019 at 2:57
3
Solved
In Android, it is advisable to refrain from using enum due to performance issue. This is true until recently, where it was announced in Google IO 2018 that enums are now safe to use though avoiding...
Ernestineernesto asked 3/12, 2018 at 5:55
1
Solved
I have just read that Java 15 should have sealed classes.
jep360 says:
Sealed classes and interfaces restrict which other classes or interfaces may extend or implement them.
I thought that ...
Niple asked 25/9, 2020 at 9:44
1
Solved
I have a simple sealed class, MyShape:
public sealed class MyShape permits MyCircle {
private final int width;
private final int height;
public MyShape(int width, int height) {
this.width = w...
Succedaneum asked 17/9, 2020 at 21:44
2
Solved
I don't understand why the compiler suggests me to convert a sealed class with the subclasses, to objects, let see an example:
sealed class CallState
class SendReceive : CallState()
class SendOnl...
Murine asked 26/3, 2020 at 17:48
0
Based on this post by Florina Muntenescu I have 2 questions:
Question 1: In the following situation considering a Respository response SomeApiResult:
sealed class SomeApiResult<out T : Any>...
Phelps asked 11/3, 2020 at 17:42
1
Solved
Context
I have this sealed class and each of its children:
sealed class Section
class SearchSection : Section()
class FavoritesSection : Section()
class RecommendationsSection : Section()
class ...
Unrefined asked 21/12, 2019 at 21:59
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