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Head First 设计模式----DecoratorPattern

2015-01-22 11:27 267 查看

装饰者模式动态地将责任附加到对象上。若要扩展功能，装饰者提供了比继承更有弹性的替代方案。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public abstract class Beverage
{
public String description = "Unknow beverage";

public virtual String getDescription()
{
return description;
}

public abstract Double cost();
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public abstract class CondimentDecorator:Beverage
{
public abstract String getDescription();
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public class DarkRoast:Beverage
{
public DarkRoast() {
description = "DarkRoast Coffe";
}

public override Double cost()
{
return 0.99;
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public abstract class Decaf:Beverage
{

public Decaf() {
description = "Decaf Coffee";
}

public override Double cost()
{
return 1.05;
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public class Espresso:Beverage
{
public Espresso() {
description = "Espresso Coffee";
}

public override Double cost()
{
return 1.99;
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public class HouseBlend:Beverage
{
public HouseBlend() {
description = "House Blend Coffee";
}

public override Double cost()
{
return 0.89;
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public class Milk :Beverage
{
Beverage beverage;

public Milk(Beverage beverage)
{
this.beverage = beverage;
}

public override String getDescription() {
return beverage.getDescription() + ",Milk";
}

public override Double cost()
{
return 0.10 + beverage.cost();
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public class Mocha : Beverage
{
Beverage beverage;

public Mocha(Beverage beverage) {
this.beverage = beverage;
}

public override String getDescription()
{
return beverage.getDescription() + ",Mocha";
}

public override Double cost() {
return 0.20 + beverage.cost();
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public class Soy : Beverage
{
Beverage beverage;

public Soy(Beverage beverage)
{
this.beverage = beverage;
}

public override String getDescription()
{
return beverage.getDescription() + ",Soy";
}

public override Double cost()
{
return 0.15+beverage.cost();
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace HeadFirst.Decorator
{
public class Whip : Beverage
{
Beverage beverage;

public Whip(Beverage beverage){
this.beverage = beverage;
}

public override String getDescription()
{
return this.beverage.getDescription() + ",Whip";
}

public override Double cost()
{
return 0.10 + beverage.cost();
}
}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using HeadFirst.Decorator;

namespace HeadFirst
{
class Program
{
static void Main(string[] args)
{
//Decorator装饰者模式
Beverage beverage = new Espresso();
Console.Write(beverage.getDescription() + ":" + beverage.cost());
Console.ReadLine();
}
}
}

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