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[问答题] 某咖啡店当卖咖啡时,可以根据顾客的要求在其中加入各种配料,咖啡店会根据所加入的配料来计算费用。咖啡店所供应的咖啡及配料的种类和价格如下表所示。中级软件设计师,历年真题,2012年上半年(下午)《软件设计师》真题现采用装饰器(Decorator)模式来实现计算费用的功能,得到如图6-1所示的类图中级软件设计师,历年真题,2012年上半年(下午)《软件设计师》真题【Java代码】import java.util.*;(1)class Beverage{//饮料String description="Unknown Beverage";public(2)(  ){return description;}public(3);}abstract class CondimentDecorator extends Beverage{//配料(4);}class Espresso extends Beverage{//蒸馏咖啡private final int ESPRESSO_PRICE=25;public Espresso(  ){description="Espresso";}public int cost(  ){return ESPRESSO_PRICE;}}class DarkRoast extends Beverage{//深度烘焙咖啡private finalint DARKROAST_PRICE=20;public DarkRoast0{description="DarkRoast";}public int cost(  ){rcturn DARKROAST PRICE;}}class Mocha extends CondimentDecorator{//摩卡private final int MOCHA_PRICE=10;public Mocha(Beverage beverage){this.beverage=beverage;}public String getDescription(  ){return beverage.getDescription0+",Mocha";}public int cost(  ){return MOCHA_PRICE+beverage.cost(  );}}class Whip extends CondimentDecorator{//奶泡private finalint WHIP_PRICE=8;public Whip(Beverage beverage){this.beverage=beverage;}public String getDescription(  ){return beverage.getDescription(  )+",Whip";}public int cost(  ){return WHIP_PRICE+beverage.cost(  );}}public class Coffee{public static void main(String args[]){Beverage beverage=new DarkRoast(  );beverage=new Mocha((5));beverage=new Whip((6));System.out.println(beverage.getDescription0+"¥"+beverage.cost(  ));}}编译运行上述程序,其输出结果为:DarkRoast,Mocha,Whip¥38
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