Factory Class Design Pattern Guide

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Factory method lets a class defer instantiation to subclasses
Factory pattern intends to overcome these drawbacks by delegating the task of object creation to a factory-class
Here those factory class methods are used for returning objects of two different class hierarchies
The factory patterns can be used in following cases: 1 when a class does not know which class of objects it must create
Here those factory class methods are used for returning objects of two different class hierarchies