Factory Pattern

Factory pattern is one of most used design pattern in Java, and it defines an interface to create the object without exposing the creation logic to the client, and has internal logic to decide which class to instantiate.

Factory Pattern

TrackingAgent interface

Concrete Tracking Agents

Factory Class
An application usually needs only one instance of the Factory class. This means that it is best to implement it as a Singleton or a class with static method.


DHL agent tracks 576954654
UPS agent tracks 1Z657576954654
FedEx agent tracks 679676576

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