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&pineapple”);
		}
	}
	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