2025年02月11日来源:信管网 作者:cnitpm
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软件设计师案例分析每日一练试题内容(2025/2/10)
试题六(共15分)
阅读下列说明和Java代码,将应填入(n)处的字句写在答题纸的对应栏内。
【说明】
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6-1所示的类图。
【java代码】
class invoice{
public void printInvoice(){:
System.out.println("This is the content of the invoice!");
}
}
class Decorator:extends Invoice{
protected Invoice ticket;
public Decorator(lnvoice t){
ticket=t;
}
public void printinvoice(){
if(ticket!=NULL)
(1);
}
}
class FootDecorator extends Decorator{
public FootDecorator(lnvoice t){
super(t);
}
public void printinvoice(){
Systent.out.println("This is the header of the invoice!");
(2);
}
}
class FootDecorator extends Decorator{
public FootDecorator(invoice t):{
super(t);
}
public void printlnvoice(){
(3);
Systent.out.println("This is the header of the invoice!");
}
}
Class test{
public static void main(string[]args){
Invoice t=new invioce();
Invoice ticket;
Ticket=(4);
Ticket.Printinvoice();
Systent.out.println(“--------------“)
Ticket=(5);
Ticket.Printinvoice();
}
}
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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