答案及解析：[问答题]某发票（lnvoice）由抬头（Head）部分、正文部分和脚注（Foot）部分构成。现采用装饰（Decorator）模式实现打印发票的功能，得到如图5-1所示的类图。【C++代码】#includeus

问题：

[问答题] 某发票（lnvoice）由抬头（Head）部分、正文部分和脚注（Foot）部分构成。现采用装饰（Decorator）模式实现打印发票的功能，得到如图5-1所示的类图。中级软件设计师,历年真题,2016年下半年（下午）《软件设计师》真题

【C++代码】#includeusing namespace std;class Invoice{public:（1）{cout＜＜"This is the content of the invoice!"＜＜endl;}};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＜＜”------------------------”＜＜endl;FootDecorator a(NULL);HeadDecorator b(（5）);b.printInvoice（　　）;return 0;}程序的输出结果为：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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答案解析：

╋纠错

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