问变换对象的模式

EN

Public class Customer {
   String customerid
   List<Order> orders
}

Public class Order {
   Integer id
   Date orderDate
}

/** Transformed objects **/
public class CustomerOrder {
   string customerid
   Integer orderid
}

Public interface CustomerDTO {
   List<CustomerOrder> getData(Date date)
}

Public class CustomerDTOImpl implements CustomerDTO {
   Private Customer customer
   Public CustomerDTOImpl(Customer customer) {
      this.customer = customer
   }

   Public List<CustomerOrder> getData(Date date) {
       ..... Code to loop through orders and create and return a list with matching order dates
   }
}