示例名称:超级递送员
示例说明:定义基类(BaseDelivery)和虚方法(Deliver),定义继承自该基类的三个子类(MilkDelivery、NewspaperDelivery和CarDelivery),重写基类的虚方法(Deliver)。
示例类图:
关键部分说明
BaseDelivery
MilkDelivery、NewspaperDelivery和CarDelivery
这三个类分别继承了BaseDelivery(is a的关系),含有一个BaseDelivery类型的私有字段和一个BaseDelivery参数的构造方法,重写父类BaseDelivery的Deliver方法。
应用
运行结果
现在是不是很开心!
示例说明:定义基类(BaseDelivery)和虚方法(Deliver),定义继承自该基类的三个子类(MilkDelivery、NewspaperDelivery和CarDelivery),重写基类的虚方法(Deliver)。
示例类图:
关键部分说明
BaseDelivery
using System;
namespace Delivery
{
public class BaseDelivery
{
public virtual void Deliver()
{
Console.WriteLine("我是早晨的送递员");
}
}
}
Deliver是虚方法,子类需要重写它。namespace Delivery
{
public class BaseDelivery
{
public virtual void Deliver()
{
Console.WriteLine("我是早晨的送递员");
}
}
}
MilkDelivery、NewspaperDelivery和CarDelivery
using System;
namespace Delivery
{
public class MilkDelivery : BaseDelivery
{
private BaseDelivery _delivery;
public MilkDelivery(BaseDelivery delivery)
{
_delivery = delivery;
}
public override void Deliver()
{
_delivery.Deliver();
Console.WriteLine("我送来牛奶!");
}
}
}
using System;
namespace Delivery
{
public class NewspaperDelivery : BaseDelivery
{
private BaseDelivery _delivery;
public NewspaperDelivery(BaseDelivery delivery)
{
_delivery = delivery;
}
public override void Deliver()
{
_delivery.Deliver();
Console.WriteLine("我送来了报纸!");
}
}
}
using System;
namespace Delivery
{
public class CarDelivery:BaseDelivery
{
private BaseDelivery _delivery;
public CarDelivery(BaseDelivery delivery)
{
_delivery = delivery;
}
public override void Deliver()
{
_delivery.Deliver();
Console.WriteLine("我还送来了你买的小汽车,梦想成真了吧,哈哈!");
}
}
}
namespace Delivery
{
public class MilkDelivery : BaseDelivery
{
private BaseDelivery _delivery;
public MilkDelivery(BaseDelivery delivery)
{
_delivery = delivery;
}
public override void Deliver()
{
_delivery.Deliver();
Console.WriteLine("我送来牛奶!");
}
}
}
using System;
namespace Delivery
{
public class NewspaperDelivery : BaseDelivery
{
private BaseDelivery _delivery;
public NewspaperDelivery(BaseDelivery delivery)
{
_delivery = delivery;
}
public override void Deliver()
{
_delivery.Deliver();
Console.WriteLine("我送来了报纸!");
}
}
}
using System;
namespace Delivery
{
public class CarDelivery:BaseDelivery
{
private BaseDelivery _delivery;
public CarDelivery(BaseDelivery delivery)
{
_delivery = delivery;
}
public override void Deliver()
{
_delivery.Deliver();
Console.WriteLine("我还送来了你买的小汽车,梦想成真了吧,哈哈!");
}
}
}
这三个类分别继承了BaseDelivery(is a的关系),含有一个BaseDelivery类型的私有字段和一个BaseDelivery参数的构造方法,重写父类BaseDelivery的Deliver方法。
应用
using System;
using System.Collections.Generic;
using System.Text;
namespace Delivery
{
class Program
{
static void Main(string[] args)
{
BaseDelivery baseDelivery = new BaseDelivery();
MilkDelivery milkDelivery = new MilkDelivery(baseDelivery);
NewspaperDelivery newsDelivery = new NewspaperDelivery(milkDelivery);
CarDelivery carDelivery = new CarDelivery(newsDelivery);
carDelivery.Deliver();
Console.Read();
}
}
}
任何继承了BaseDelivery的子类都可以做为其它子类的构造函数的参数传递。即可实现对该子类的装饰(Decorator)。using System.Collections.Generic;
using System.Text;
namespace Delivery
{
class Program
{
static void Main(string[] args)
{
BaseDelivery baseDelivery = new BaseDelivery();
MilkDelivery milkDelivery = new MilkDelivery(baseDelivery);
NewspaperDelivery newsDelivery = new NewspaperDelivery(milkDelivery);
CarDelivery carDelivery = new CarDelivery(newsDelivery);
carDelivery.Deliver();
Console.Read();
}
}
}
运行结果
现在是不是很开心!