The C# programming language ... on both virtual and abstract methods and when they should be used. A virtual method is one that is declared as virtual in the base class. A method is declared ...

For example, you can define methods, properties, and events in an interface or an abstract class that must be implemented by types that extend it. However, from C# 8.0 onward, an interface can ...

Interfaces, however, support multiple inheritances where abstract classes don't. Implementation is done similarly in Java. For example, using the keyword implements will make a Java interface, while ...

Also called an "abstract superclass," in object technology, it is a class created as a master structure. No objects of an abstract class are created, rather subclasses of the abstract class are ...