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5-1所示的类图。
图5-1类图
【C++代码】
#include＜iostream>
#include＜string>
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
正确答案及解析
正确答案
解析
（1）virtual void buildParts()=0
（2）this->pizzaBuilder=pizzaBuilder
（3）pizzaBuilder->buildParts()
（4）waiter->setPizzaBuilder(hawaiian_pizzabuilder)
（5）waiter->construct()
1.从类图中可以看到这个buildparts函数缺失，又子类中也有buildParts，所以它是虚函数，在扩展类中定义使用。
2.这部分填写设置构建器内容，在waiter类里面，定义pizzaBuilder。
3.从类图知道，构建方法应该是buildParts，当前对象是pizzaBuilder。
4.前面定义了对象waiter，新建hawaiian_pizzabuilder类，调用waiter的set方法。
5.调用waiter类中的construct方法，这样可以得到。
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