Design Patterns Simplified - Part 5 (Factory Method)

I am here to continue the discussion around Design Patterns. Today we will discuss another creational design pattern called Factory Method.

In case, you have not had a look at my previous articles, go through the following link:

• Design Patterns Simplified: Part 1
• Design Patterns Simplified - Part 2 (Singleton)
• Design Patterns Simplified - Part 3 (Simple Factory)
• Design Patterns Simplified - Part 4 (Abstract Factory)

Before talking about its implementation let’s begin with defining it.

Factory method pattern is similar to simple Factory pattern with a few difference. Unlike Simple factory, here client doesn’t call the factory class instead it calls the factory interface. Factory interface further have concrete implementations where object creation is performed.

Now let’s talk about implementation.

How to use Factory Method Pattern

Let’s try to understand using simple example.

Assume the client wants to know the on-road price of various brands of cars and have an interface as in the following,