java設計模式的抽象工廠模式怎么寫

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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中插入一個用戶");
        }
        public UserEntity GetUser(int id)
        {
            Console.WriteLine("在SQL中獲取一個用戶");
            return null;
        }
    }

    class AccessUser : IUser
    {
        public void InsertUser(UserEntity user)
        {
            Console.WriteLine("在Access中插入一個用戶");
        }
        public UserEntity GetUser(int id)
        {
            Console.WriteLine("在Access中獲取一個用戶");
            return null;
        }
    }

    //抽象工廠改簡單工廠->反射
    public class SimpleFactory
    {
        private static string assemblyName = "抽象工廠";        
        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;
        }
    }
        <appSettings>
    <add key="DB" value="Product.Sql"/>
  </appSettings>

    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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