Object Oriented Programming using C#

Object Oriented Programming using C#

Object Roles and the Importance of Polymorphism

An interface is a sort of contract. The SaleableItem interface says “I undertake to provide, at least, methods with these

signatures:

public void SellCopy ();

public double Price ();

though I might include other things as well”

Where more than one class implements an interface it provides a guaranteed area of commonality which polymorphism

can exploit.

Think of a car and a driving game in an arcade. They certainly are not related by any “is a” relationship – they are

entirely different kinds of things, one a vehicle, the other an arcade game. But they both implement what we could call a

“SteeringWheel interface” which we can use in exactly the same way, even though the implementation (mechanical linkage

in the car, video electronics in the game) are very different.

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