Kotlin’s abstract is very similar to its C# counterpart, and open/closed rules are identical to those for open classes.
C#
public abstract class AbstractThing
{
public AbstractThing(string name)
{
//...
}
public void Run()
{
DoWork();
}
protected abstract void DoWork();
}
public sealed class Thing : AbstractThing
{
public Thing(string name) : base(name)
{
//...
}
protected override void DoWork()
{
//...
}
}
Kotlin
abstract class AbstractThing(val name: String) {
fun run() {
doWork()
}
protected abstract fun doWork()
}
class Thing(name: String) : AbstractThing(name) {
override fun doWork() {
//...
}
}