How Can Interfaces Solve Code Redundancy in Object-Oriented Programming?

Interface in object-oriented programming

In object-oriented programming, interfaces provide a mechanism for specifying conventions that classes must adhere to without being bound by inheritance relationships. Although C# does not support multiple inheritance, interfaces provide a powerful alternative that enables classes to implement multiple contracts.

Take the pizza ordering system as an example. There may be different types of pizza, each with its own unique preparation requirements. Using a traditional approach, you might create a base class called Pizza and override the Prepare() method for each pizza type. However, this approach leads to code redundancy and scalability issues.

A working solution is to use an interface called IPizza. This interface defines a single member function called Prepare(), indicating that all pizzas must implement this functionality. Then, each pizza class (such as PepperoniPizza and HawaiiPizza) can implement the IPizza interface, providing a concrete implementation of the Prepare() method.

Now, the code responsible for processing the pizza order can iterate through the collection of IPizza objects and call their Prepare() method. The code does not need to know the specific pizza type because the interface ensures that each pizza is made correctly according to its implementation.

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