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 …

Dec 16, 2008 · 153 You can't override a static method, so making it abstract would be meaningless. Moreover, a static method in an abstract class would belong to that class, and …

Abstract Factory is a very central design pattern for Dependency Injection (DI). Here's a list of Stack Overflow questions where application of Abstract Factory has been accepted as the …

An abstract class cannot be instantiated by definition. In order to use this class, you must create a concrete subclass which implements all virtual functions of the class.

Jun 30, 2012 · Abstract implies virtual. A non-default constructor can never be called polymorphically, so virtual and abstract are not allowed on constructors. IF in a future version …

Nov 30, 2012 · You can still instantiate the abstract base class itself, and you won't find your mistake until you call the abstract method at runtime. But if you're dealing with a small set of …

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 …

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 …

Apr 25, 2017 · Abstract classes can be used to store methods in an OOP-based "library"; since the class doesn't need to be instantiated, and would make little sense for it to be, keeping …

Jan 27, 2011 · Declaring a method abstract means that subclasses have to provide an implementation for that method. The two are separate concepts, though obviously you can't …