阅读下列说明和 Java代码，将应填入 （n) 处的字句写在答题纸的对应栏内。 【说明】 某快餐厅主要制

阅读下列说明和 Java代码，将应填入 (n) 处的字句写在答题纸的对应栏内。 【说明】 某快餐厅主要制作并出售儿童套餐，一般包括主餐(各类比萨)、饮料和玩具，其餐品种类可能不同，但其制作过程相同。前台服务员 (Waiter) 调度厨师制作套餐。现采用生成器 (Builder) 模式实现制作过程，得到如图 6-1 所示的类图。【Java代码】 class Pizza { private String parts； public void setParts(String parts) { this.parts = parts; } public String toString() { return this.parts; } } abstract class PizzaBuilder { protected Pizza pizza; public Pizza getPizza() { return pizza; } public void createNewPizza() { pizza = new Pizza(); } public (1) ; } class HawaiianPizzaBuilder extends PizzaBuilder { public void buildParts() { pizza.setParts("cross + mild + ham&pineapp1e”}; } class SpicyPizzaBuilder extends PizzaBuilder { public void buildParts() { pizza.setParts("pan baked + hot + pepperoni&salami"); } } class Waiter { private PizzaBuilder pizzaBuilder; public void setPizzaBuilder(PizzaBuilder pizzaBuilder) { /*设置构建器*/ (2 ) ; } public Pizza getPizza(){ return pizzaBuilder.getPizza(); } public void construct() { /*构建*/ pizzaBuilder.createNewPizza(); (3 ) ; } } Class FastFoodOrdering { public static viod mainSting[]args) { Waiter waiter = new Waiter(); PizzaBuilder hawaiian_pizzabuilder = new HawaiianPizzaBuilder(); (4 ) ; (5 ) ; System.out.println("pizza: " + waiter.getPizza()); } } 程序的输出结果为： Pizza:cross + mild + ham&pineapple