试题内容

阅读下列说明和 C++代码，将应填入(n)处的字句写在答题纸的对应栏内。
【说明】
某快餐厅主要制作井出售儿童套餐，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 5-1 所示的类图。

图5-1    类图
【C++代码】
#include
#include
using namespace std;

class Pizza {
private: string parts;
public:
void setParts(string parts) {     this->parts=parts;  }
string getParts() {  return parts;   }
};
class PizzaBuilder {
protected:Pizza* pizza;
public:
Pizza* getPizza() {  retum pizza;  }
void createNewPizza() { pizza = new Pizza();     }
(   1   );
}
class HawaiianPizzaBuilder :public PizzaBuilder {
public:
void buildParts() { pizza->setParts("cross +mild + ham&pineapple");   }
};
class SpicyPizzaBuider: public PizzaBuilder {
public:
void buildParts() { pizza->setParts("pan baked +hot + ham&pineapple");    }

}

Class Waiter{
Private:
PizzaBuilder* pizzaBuilder;
public:
void setPizzaBuilder(PizzaBuilder* pizzaBuilder) {   /*设置构建器*/
(  2  )
}
Pizza* getPizza() {  return pizzaBuilder->getPizza(); }
void construct() {     /*构建*/
pizzaBuilder->createNewPizza();
(  3  )
}
};

int main(){
Waiter*waiter=new Waiter();
PizzaBuilder*hawaiian pizzabuilder=new HawaiianPizzaBuilder()

(   4  );
(   5  );
cout<< "pizza: "<< waiter->getPizza()->getParts()<< endl;
}
程序的输出结果为:
pizza: cross + mild + ham&pineapple
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