试题内容

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
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