阅读下列说明和C++代码,填补代码中的空缺,将解答填入答题纸的对应栏内。
【说明】
以下C++代码实现一个简单客户关系管理系统(CrM)中通过工厂(Customerfactory)对象来创建客户(Customer)对象的功能。客户分为创建成功的客户(realCustomer)和空客户(NullCustomer)。空客户对象是当不满足特定条件时创建或获取的对象。类间关系如图6-1所示。
图6-1
【C++代码】
#include
#include
using namespace std;
class Customer{
protected:
string name;
public:
( 1 ) boll isNil()=0;
( 2 ) string getName()=0;
﹜;
class RealCustomer ( 3 ){
Public:
realCustomer(string name){this->name=name;﹜
bool isNil(){ return false; ﹜
string getName(){ return name; ﹜
﹜;
class NullCustomer ( 4 ) {
public:
bool isNil(){ return true; ﹜
string getName(){ return 〝Not Available in Customer Database〞; ﹜
﹜;
class Customerfactory{
public:
string names[3]={〝rob〞, 〝Joe〞,〝Julie〞﹜;
public:
Customer*getCustomer(string name){
for (int i=0;i<3;i++){
if (names[i].( 5 ) ){
return new realCustomer(name);
﹜
﹜
return ( 6 );
﹜
﹜;
class CRM{
public:
void getCustomer(){
Customerfactory*( 7 );
Customer*customer1=cf->getCustomer(〝Rob〞);
Customer*customer2=cf->getCustomer(〝Bob〞);
Customer*customer3=cf->getCustomer(〝Julie〞);
Customer*customer4=cf->getCustomer(〝Laura〞);
cout<<〝Customers〞<<endl;
cout<getName()<<endl; delete customer1;
cout<getName()<<endl; delete customer2;
cout<getName()<<endl; delete customer3;
cout<getName()<<endl; delete customer4;
delete cf;
﹜
﹜;
int main(){
CRM*crs=new CRM();
crs->getCustomer();
delete crs;
return 0;
﹜
/*程序输出为:
Customers
rob
Not Available in Customer Database
Julie
Not Available in Customer Database
*/</endl; delete customer4;
</endl; delete customer3;
</endl; delete customer2;
</endl; delete customer1;
</endl;