试题六(共15分) 阅读下列说明和Java代码,将入(n)处的字句写在答题纸的对应栏内。 【说明】 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。 【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 DarkRoast() { 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.getDescription() +'¥' +beverage.cost()); } } 编译运行上述程序,其输出结果为: DarkRoast, Mocha, Whip ¥38