1、2022年3月22日星期二Neusoft Computer Science and Technology Department copy right1OO System Analysis & Design【09_Factory Pattern】2022年3月22日星期二Neusoft Computer Science and Technology Department copy right2Enjoy pizza2022年3月22日星期二Neusoft Computer Science and Technology Department copy right3Our job is:l To d

2、esign a pizza Store, which could create a pizza object.2022年3月22日星期二Neusoft Computer Science and Technology Department copy right4Version 1: simple factoryCheesePizzaPepperoniPizzaClamPizzaPizzaStoreorderPizza()SimplePizzaFactorycreatePizza()Pizzaprepare()bake()cut()box()2022年3月22日星期二Neusoft Compute

3、r Science and Technology Department copy right5How to offer different styles?Chicago styleNew York style2022年3月22日星期二Neusoft Computer Science and Technology Department copy right6Version 2: factory methodNYFactorycreatePizza()ChicagoFactorycreatePizza()NYStyleCheesePizzaNYStylePepperoniPizzaNYStyleC

4、lamPizzaNYStyleVeggiePizzaChicagoStyleCheesePizzaChicagoStylePepperoniPizzaChicagoStyleClamPizzaChicagoStyleVeggiePizzaPizzaStoreorderPizza()FactorycreatePizza()2022年3月22日星期二Neusoft Computer Science and Technology Department copy right7The Factory Method PatternlThe Factory Method Pattern defines an

5、 interface for creating an object, but lets subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.2022年3月22日星期二Neusoft Computer Science and Technology Department copy right8Class diagram: Factory MethodProductCreatorfactoryMethod()otherOperation()ConcreteCreatorfactoryMethod()ConcreteProduct2022年3月22日星期二Neusoft C