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試題六（共15分）
閱讀下列說(shuō)明和Java代碼，將應(yīng)填入（n）處的字句寫在答題紙的對(duì)應(yīng)欄內(nèi)。
【說(shuō)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(shí)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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