Solution: Generic Consumer
abstract class Consumer<in T> {
abstract fun consume(elem: T)
}
class Printer<in T> : Consumer<T>() {
override fun consume(elem: T) {
// ...
}
}
class Sender<in T> : Consumer<T>() {
override fun consume(elem: T) {
// ...
}
}
Example solution in playground
abstract class Consumer<in T> {
abstract fun consume(elem: T)
}
class Printer<in T> : Consumer<T>() {
override fun consume(elem: T) {
// ...
}
}
class Sender<in T> : Consumer<T>() {
override fun consume(elem: T) {
// ...
}
}
fun main(args: Array<String>) {
val p1 = Printer<Number>()
val p2: Printer<Int> = p1
val p3: Printer<Double> = p1
val s1 = Sender<Any>()
val s2: Sender<Int> = s1
val s3: Sender<String> = s1
val c1: Consumer<Number> = p1
val c2: Consumer<Int> = p1
val c3: Consumer<Double> = p1
}
