java设计模式的抽象工厂模式怎么写

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public class UserEntity    {        public int ID { get; set; }        public string Name { get; set; }    }public interface IUser    {        void InsertUser(UserEntity user);        UserEntity GetUser(int id);    }class SqlUser: IUser    {        public void InsertUser(UserEntity user)        {            Console.WriteLine("在SQL中插入一个用户");        }        public UserEntity GetUser(int id)        {            Console.WriteLine("在SQL中获取一个用户");            return null;        }    }    class AccessUser : IUser    {        public void InsertUser(UserEntity user)        {            Console.WriteLine("在Access中插入一个用户");        }        public UserEntity GetUser(int id)        {            Console.WriteLine("在Access中获取一个用户");            return null;        }    }    //抽象工厂改简单工厂->反射    public class SimpleFactory    {        private static string assemblyName = "抽象工厂";                private static string db = ConfigurationSettings.AppSettings["DB"];                public static IUser CreateUser()        {            //switch (db)            //{            //    case "sql":return new SqlUser();            //    case "access": return new AccessUser();            //}            //return null;                  string className = assemblyName + "." + db + "User";            IUser iuser = (IUser)Assembly.Load(assemblyName).CreateInstance(className);            return iuser;        }        public static IDepartment CreateIDepartment()        {                        string className = assemblyName + "." + db + "Department";            IDepartment department = (IDepartment)Assembly.Load(assemblyName).CreateInstance(className);            return department;        }    }                  static void Main(string[] args)        {            //UserEntity user = new UserEntity();            //IFactory factory = new AccessFactory();            //IUser su = factory.CreateUser();            //su.InsertUser(user);            //su.GetUser(1);            //DepartmentEntity department = new DepartmentEntity();            //IDepartment de = factory.CreateDepartment();            //de.InsertDepartment(department);            //de.GetDepartment(1);            //Console.ReadLine();            UserEntity user = new UserEntity();            DepartmentEntity department = new DepartmentEntity();            IUser su = SimpleFactory.CreateUser();            su.InsertUser(user);            su.GetUser(1);            IDepartment dep = SimpleFactory.CreateIDepartment();            dep.InsertDepartment(department);            dep.GetDepartment(1);            Console.ReadLine();        }

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