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What are the differences between abstract classes and interfaces when should you use one over the other?
The short answer: An abstract class allows you to create functionality that subclasses can implement or override. An interface only allows you to define functionality, not implement it. And whereas a class can extend only one abstract class, it can take advantage of multiple interfaces.
In what situations would you use interfaces instead of abstract classes?
Consider using interfaces if :
- You expect that unrelated classes would implement your interface.
- You want to specify the behaviour of a particular data type, but not concerned about who implements its behaviour.
- You want to take advantage of multiple inheritance of type.
Which is better an abstract class or an interface?
On the other hand, if you use interfaces, you would need to implement all the methods in the class that extends the interface. An abstract class is a good choice if you have plans for future expansion.
What is the definition of an abstract class in C #?
An abstract class is a way to achieve the abstraction in C#. An Abstract class is never intended to be instantiated directly. This class must contain at least one abstract method, which is marked by the keyword or modifier abstract in the class definition.
Can a non abstract class inherit from an abstract class?
Abstract class can contain abstract members as well as non-abstract members in it. A class can only inherit from one abstract Class. We cannot create object of an abstract class. It is also user defined type like a class which only contains abstract members in it.
Can a class be inherited from an interface?
A class can be inherited from a class or from an interface. Interface contains only abstract methods. We cannot create object of an interface. The default scope for a member in Interface is Public. So, no need to use the Public access specifier in the program.