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软件设计师案例分析每日一练试题内容(2023/5/25)
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 HeadDecorator extends Decorator{
public HeadDecorator(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 footnote 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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信管网cnitpm599717134404:
1 printinvoice()
2 t.printinvoice()
3 t.printinvoice()
4 new headdecorator(ticket)
5 new footdecorator(ticket)
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www.cnitpm.com/st/381743190.html