How can the subclass override a concrete method of the superclass and declare it as abstract?

Question

Because we know abstract subclass can't implement or override an abstract method, i mean if we declare it as abstract .

Answer 1

Is this what you are looking for?

https://code.sololearn.com/cMMVwTvxs8X9/?ref=app

Answer 2

Abstract class: is a restricted class that cannot be used to create objects (to access it, it must be inherited from another class).

Abstract method: can only be used in an abstract class, and it does not have a body. The body is provided by the subclass (inherited from).