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軟件設(shè)計師案例分析每日一練試題內(nèi)容（2022/6/28）

閱讀下列說明和java代碼，將應填入  （n）  處的字句寫在答題紙的對應欄內(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?，F(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 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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