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】
生成器(Builder)模式的意图是将一个复杂对象的构建与它的表示分离,使得同样的构建过程可以创建不同的表示。图5-1所示为其类图。
【C++代码】
#include＜iostream>
#include＜string>
usingnamespacestd;
classProduct{
private:???
stringpartA,partB;
public:
Product(){??}
???void
setPartA(conststring&s){PartA=s;}
????void
setPartB(conststring&s){PartB=s;}
//?其余代码省略
};
classBuilder{
public:
???????(1)??;
virtualvoidbuildPartB()=0;
???????(2)??;
};
classConcreteBuilder1:publicBuilder{
private:
Product*??product;
public:
ConcreteBuilder1(){product=newProduct();????}
???void
buildPartA(){?????(3)????("ComponentA");}
???void
buildPartB(){?????(4)????("ComponentB");}
Product*getResult(){returnproduct;}
//?其余代码省略
};
classConcreteBuilder2:publicBuilder{???
/*???代码省略???*/
};
classDirector{
private:?
Builder*builder;
public:??
Director(Builder*pBuilder){builder=pBuilder;}
????void
construct(){
???????(5)????;???
//?其余代码省略
?????}
//?其余代码省略
};
intmain(){
Director*director1=newDirector(newConcreteBuilder1());?
director1->construct();??
deletedirector1;???
return0;
(1) virtual void buildPartA() = 0 (2) virtual Product * getResult() = 0 (3) product->setPartA (4) product->setPartB (5) builder->buildPartA(); builder->buildPartB(); Product* p = builder->getResult();
