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 …

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 …

An abstract factory provides an interface for creating families of related objects without specifying their concrete classes What is the use of Abstract Factory Pattern as we can achieve the task …

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 …

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 …

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 …

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 …

Abstract classes/methods are generally used when a class provides some high level functionality but leaves out certain details to be implemented by derived classes.

I just make the abstract base class into a concrete one by defining the "abstract" methods as virtual, and throwing an exception in them, just in case any naughty derived classes try to call …