Assignment: Factory Method Pattern - Customer Factory The Factory Method Pattern, a creational design pattern, defines a method for creating objects extending a common interface. Often used with the Factory Method Pattern, the Null Object Pattern models null behavior This assignment demonstrates the Factory Method Pattern by developing a customer factory that creates customer objects. A null customer object is created for non-existent customers. Please submit only the completed program file (Program [...cs) to the drop box Overvievw The classic Factory Method Pattern lets subclasses decide which class to instantiate. FactoryMethod)-- +AnOperation0 product = FactoryMethod() ConcreteProduct +FactoryMethod --|- return new ConcreteProduct C ERICH GAMMA, RICHARD HELM, RALPH JOHNSoN, AND JOHN VLISSIDES, DESIGN PATTERNS, ELEMENTS OF REUSABLE OBJECT-ORIENTED SOFTWARE (INDIANAPOLIS: ADDISON-WESLEY, 1995), 108. In practice, however, factory methods are often implemented as static methods. Static factories are not polymorphic because sub-classing is not allowed. Still, in many ways, this is the simplest approach to implementing a factory method The Null Object Pattern simplifies the process of returning null values from factory methods. Regarded as special-case objects, null objects facilitate coding and testing. Basically they are just "do-nothing" objects Client +Operation Dependency Nullobject +Operation(0 +OperationO THE NULL OBJECT PATTERN Assignment: Factory Method Pattern - Customer Factory The Factory Method Pattern, a creational design pattern, defines a method for creating objects extending a common interface. Often used with the Factory Method Pattern, the Null Object Pattern models null behavior This assignment demonstrates the Factory Method Pattern by developing a customer factory that creates customer objects. A null customer object is created for non-existent customers. Please submit only the completed program file (Program [...cs) to the drop box Overvievw The classic Factory Method Pattern lets subclasses decide which class to instantiate. FactoryMethod)-- +AnOperation0 product = FactoryMethod() ConcreteProduct +FactoryMethod --|- return new ConcreteProduct C ERICH GAMMA, RICHARD HELM, RALPH JOHNSoN, AND JOHN VLISSIDES, DESIGN PATTERNS, ELEMENTS OF REUSABLE OBJECT-ORIENTED SOFTWARE (INDIANAPOLIS: ADDISON-WESLEY, 1995), 108. In practice, however, factory methods are often implemented as static methods. Static factories are not polymorphic because sub-classing is not allowed. Still, in many ways, this is the simplest approach to implementing a factory method The Null Object Pattern simplifies the process of returning null values from factory methods. Regarded as special-case objects, null objects facilitate coding and testing. Basically they are just "do-nothing" objects Client +Operation Dependency Nullobject +Operation(0 +OperationO THE NULL OBJECT PATTERN