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軟件設(shè)計師案例分析每日一練試題內(nèi)容(2024/1/8)
試題六(共15分)
閱讀下列說明和Java代碼,將應(yīng)填入(n)處的字句寫在答題紙的對應(yīng)欄內(nèi)。
【說明】
某發(fā)票(lnvoice)由抬頭(Head)部分、正文部分和腳注(Foot)部分構(gòu)成。現(xiàn)采用裝飾(Decorator)模式實現(xiàn)打印發(fā)票的功能,得到如圖6-1所示的類圖。
【java代碼】
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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