The factory method design pattern defines interface for creating an object. But lets subclasses decide which class to instantiate. Factory method lets the class defer instantiation to subclasses.
Pattern type - Creational
Factory design pattern allows to hide logic responsible for creation of an object.
Within this pattern some general IFabric interface and IProduct
interface are defined. IFabric has to have a method which returns objects of a IProducts.
Specific Fabrics will implement IFabric interface, while specific Products
will implement IProduct interface.
Car fabric may be a good example for such pattern. An interface
ICarFabric with method fabricateVehicle(Specification spec) provides mechanism
for obtaining new IVehicle objects through provided Specification.
Concrete CarFabric implementation allow to deliver particular car models.
Each Car implement IVehicle interface.
In a given example - ToyotaFabric returns objects of a ToyotaCar while NissanFabric creates NissanCar.
PriusCar or JukeCar are examples of classes specific to particular manufacturer.