Nov 9, 2011 · For me it is really useful for design of a structure of a set of inherited classes. 3) What is the situation in which abstract classes become necessary? I don't think an abstract class is ever …

Why can't Java classes have abstract fields like they can with abstract methods? For example: I have two classes that extend the same abstract base class. These two classes each have a method that...

Nov 29, 2016 · By adding the feature of abstract methods and types you prevent the unintended use of an incomplete type by someone who doesn't realize that it's incomplete. It provides a clear contract …

Mar 15, 2015 · Why is it possible to write constructor for an abstract class in C#? As far as I know we can't instantiate an abstract class.. so what is it for? You can't instantiate the class, right?

In C#, when should you use interfaces and when should you use abstract classes? What can be the deciding factor?

For abstract methods you have to explicibly state it, yes. For virtual methods it is more complicated. If you don't state the override keyword there, the original method will become hidden. If this is your …

Jul 4, 2011 · An abstract class contains at least one pure virtual function. So basically, an abstract class is an abstract class because it's designed to be a base class (some base classes by definition need …

Oct 2, 2009 · When and why should abstract classes be used? I would like to see some practical examples of their uses. Also, what is the difference between abstract classes and interfaces?

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.