Java设计模式之简单工厂模式（2)

//生产产品的工厂类public class ProductFactory{　　public static Product generateProduct(int which){ //这个方法是static的　　if (which==1)　　　　return new ProductA();　　else if (which==2)　　　　return new ProductB();　　}}//抽象产品public interface Product { .....}//具体产品Apublic ProductA implement Product { ProductA () {}}//具体产品Bpublic ProductB implement Product { ProductB () {}}//调用工厂方法public Client { public method1() { ProductFactory.generateProduct(1); }}?
interface?a{} ????class?b?implements?a{}; ????class?c?implements?a{}; ????//工厂类 ??public?class?factory{ ???????public?static?a?createa(string?name){ ???????????class?cls=class.forname(name); ???????????object?obj=cls.getinstance(); ???????????return?(a)obj; ???????} ??} ??//创建实例时 ??a　b=factory.createa("b"); ??a??c=factory.createa("c");?