Creating interfaces and defining abstract classes

After completing this chapter, you will be able to:

  • Define an interface specifying the signatures and return types of methods.

  • Implement an interface in a structure or class.

  • Reference a class through an interface.

  • Capture common implementation details in an abstract class.

  • Implement sealed classes that cannot be used to derive new classes.

Inheriting from a class is a powerful mechanism, but the real power of inheritance comes from inheriting from an interface. An interface does not contain any code or data; it just specifies the methods and properties that a class that inherits from the interface must provide. By using an interface, you can completely separate the names and signatures ...

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