Kotlin provides a new type of class that is not present in the Java language. It is known as sealed classes.
In Android Development with Kotlin, a selected class is defined as a set of subclasses. it is known in advance that a type will conform to subclass types.
Syntex: Sealed class of kotlin
Sealed class DemoText
A class can be sealed by using the sealed keyword.
//sealed class DemoText
fun main(args: Array)
{
var d = Demo() //compiler error
}
//demo class created
sealed class Demo {
class A:Demo(){
fun display(){
println("Subclass A of Sealed class ") }
}
class B:Demo(){
fun display(){
println("Subclass B of sealed class")
}
}
}
fun main(args: Array<String>){
//create object demo
val obj =Demo.B()
obj.display()
val obj1=Demo.A()
obj1.display()
}
Subclass B of a Sealed class
Subclass A of a Sealed class
fun main(args: Array<String>) {
val e = A.E("Anupam")
println(e) //prints E(name=Anupam)
var d = A.D
d.name() //prints Object D
}
sealed class A{
class B : A()
class C : A()
object D : A()
{
fun name()
{
println("Object D")}}
data class E(var name: String) : A()}
E(name=Anupam)
Object D
Happy coding!