装饰者模式视频示例

package com.java.jikexueyuan.coffeebar;

public abstract class Drink {
public String description="";
private float price=0f;;


public void setDescription(String description)
{
this.description=description;
}

public String getDescription()
{
return description+"-"+this.getPrice();
}
public float getPrice()
{
return price;
}
public void setPrice(float price)
{
this.price=price;
}
public abstract float cost();

}

package com.java.jikexueyuan.coffeebar.coffee;

import com.java.jikexueyuan.coffeebar.Drink;

public class Coffee extends Drink {

@Override
public float cost() {
// TODO Auto-generated method stub
return super.getPrice();
}

}

package com.java.jikexueyuan.coffeebar.coffee;

public class Decaf extends Coffee {
public Decaf()
{
super.setDescription("Decaf");
super.setPrice(3.0f);
}
}

package com.java.jikexueyuan.coffeebar.coffee;

public class Espresso extends Coffee{

public Espresso()
{
super.setDescription("Espresso");
super.setPrice(4.0f);
}

}

package com.java.jikexueyuan.coffeebar.coffee;

public class LongBlack extends Coffee{

public LongBlack()
{
super.setDescription("LongBlack");
super.setPrice(6.0f);
}

}

package com.java.jikexueyuan.coffeebar.coffee;

public class ShortBlack extends Coffee{

public ShortBlack()
{
super.setDescription("ShortBlack");
super.setPrice(5.0f);
}

}

package com.java.jikexueyuan.coffeebar.decorator;

import com.java.jikexueyuan.coffeebar.Drink;

public class Decorator extends Drink {
private Drink Obj;

public Decorator(Drink Obj){
this.Obj=Obj;
};


@Override
public float cost() {
// TODO Auto-generated method stub

return super.getPrice()+Obj.cost();
}

@Override
public String getDescription()
{
return super.description+"-"+super.getPrice()+"&&"+Obj.getDescription();
}

}

package com.java.jikexueyuan.coffeebar.decorator;

import com.java.jikexueyuan.coffeebar.Drink;

public class Milk extends Decorator {

public Milk(Drink Obj) {
super(Obj);
// TODO Auto-generated constructor stub
super.setDescription("Milk");
super.setPrice(2.0f);
}

}

package com.java.jikexueyuan.coffeebar.decorator;

import com.java.jikexueyuan.coffeebar.Drink;

public class Chocolate extends Decorator {

public Chocolate(Drink Obj) {
super(Obj);
// TODO Auto-generated constructor stub
super.setDescription("Chocolate");
super.setPrice(3.0f);
}

}

package com.java.jikexueyuan.coffeebar.decorator;

import com.java.jikexueyuan.coffeebar.Drink;

public class Soy extends Decorator {

public Soy(Drink Obj) {
super(Obj);
// TODO Auto-generated constructor stub
super.setDescription("Soy");
super.setPrice(1.5f);
}

}

package com.java.jikexueyuan.coffeebar;

import com.java.jikexueyuan.coffeebar.coffee.Decaf;
import com.java.jikexueyuan.coffeebar.coffee.LongBlack;
import com.java.jikexueyuan.coffeebar.decorator.Chocolate;
import com.java.jikexueyuan.coffeebar.decorator.Milk;

public class CoffeeBar {

public static void main(String[] args) {

Drink order;
order=new Decaf();
System.out.println("order1 price:"+order.cost());
System.out.println("order1 desc:"+order.getDescription());

System.out.println("****************");
order=new LongBlack();
order=new Milk(order);
order=new Chocolate(order);
order=new Chocolate(order);
System.out.println("order2 price:"+order.cost());
System.out.println("order2 desc:"+order.getDescription());

}

}