Dec 16, 2009 · When inheriting an abstract class, a concrete child class must define the abstract methods, whereas an abstract class can extend another abstract class and abstract methods from …

An abstract class is a class that is declared abstract — it may or may not include abstract methods. Abstract classes cannot be instantiated, but they can be subclassed.

Jan 26, 2009 · This may be a generic OOP question. I wanted to do a generic comparison between an interface and an abstract class on the basis of their usage. When would one want to use an interface …

Abstract Classes are a good fit if you want to provide implementation details to your children but don't want to allow an instance of your class to be directly instantiated (which allows you to partially define …

Since an abstract class is nothing on its own, e.g. vehicle, we want to create an object of an concrete implementation, like Car, Bike, etc. The constructor of an abstract class gets called during object …

Nov 9, 2011 · An abstract class plays an important role in inheritance and can be very useful in class design of its inherited classes. For instance, I have used abstract classes before to define the basic …

An abstract class has an "is-a" type relationship with your subclasses. So for instance, you could have an abstract class Shape which has stuff any shape has (like a draw function), and then a class …

Jun 7, 2019 · Although only slightly related, one can perhaps instantiate an abstract class in C++: if you derive a non-abstract class B from an abstract one A, during the part of construction of B instance, …

Nov 30, 2015 · That is the only way you can "create an instance of the abstract class" - technically speaking you are creating an instance of an Anonymous class (that is extending your abstract class) …

Apr 17, 2009 · A class can implement one abstract class only due to the non-existence of Multi-inheritance in C#. After all that, the interviewer came up with the question "What if you had an …