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閱讀下列說(shuō)明和C++代碼,將應(yīng)填入 (n) 處的字句寫(xiě)在答題紙的對(duì)應(yīng)欄內(nèi)。
【說(shuō)明】
某發(fā)票(lnvoice)由抬頭(Head)部分、正文部分和腳注(Foot)部分構(gòu)成?,F(xiàn)采用裝飾( Decorator)模式實(shí)現(xiàn)打印發(fā)票的功能,得到如圖5-1所示的類圖。
【C++代碼】
#include
using namespace std;
class Invoice{ public:
(1) {
cout<<"This is the content of the invoice!"< }
};
class Decorator : public Invoice {
Invoice *ticket;
public:
Decorator(lnvoice *t) { ticket = t; }
void printInvoice(){
if(ticket != NULL) (2);
}
};
class HeadDecorator : public Decorator{
public:
HeadDecorator(lnvoice*t): Decorator(t) { }
void printInvoice() {
cout<< "This is the header of the invoice! "<< endl;
(3) ;
}
};
class FootDecorator : public Decorator{
public:
FootDecorator(Invoice *t): Decorator(t) { }
void printlnvoice(){
(4) ;
cout<< "This is the footnote of the invoice!"<< endl;
}
};
int main(void) {
Invoice t;
FootDecorator f(&t);
HeadDecorator h(&f);
h.printInvoice();
cout<<”------------------------”< FootDecorator a(NULL)
HeadDecorator b( (5) );
b.printInvoice();
return 0;
}
程序的輸出結(jié)果為:
This is the header of the invoice!
This is the content of the invoice!
This is the footnote of the invoice!
----------------------------
This is the header of the invoice!
This is the footnote of the invoice!
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