Prj10_1_bank接口

1.写一个ICustomerDao的接口，CustomerDao继承这个接口。

 

2.写一个DaoFactory这个类，里面有一个getCustomerDao()这个方法，返回一个ICustomerDao这个接口。

 

3.LoginAction这个类中：

ICustomerDao cdao = DaoFactory.getCustomerDao();//面向接口编程。

 

具体的见Prj10_1_bank

 

 

面向接口：

public class Action

{

      public void execute()

     {

             ICustomerDao cdao = DaoFactory.getCustomerDao();

             cdao.login();

     }

}

 

public class DaoFactory

{

      public static ICustomer getCustomerDao()

      {

             return new CustomerDao();

      }

}

 

public interface ICustomerDao()

{

       public abstract boolean login();

}

 

public class CustomerDao implements ICustomerDao

{

         pbulic boolean login(){/*代码*/}

}

 

 

Spring 接口：

public class Action

{

      public void execute()

     {

             ICustomerDao cdao = DaoFactory.getBean("类名");

             cdao.login();

     }

}

public class BeanFactory

{

      public static Object getBean(String className)

      {

             return Class.forName(className).newInstance();

      }

}

public interface ICustomerDao()

{

       public abstract boolean login();

}

public class CustomerDao implements ICustomerDao

{

         pbulic boolean login(){/*代码*/}

}