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第 6 题

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。

问题：6.1 【java代码】 class invoice{

public void printInvoice(){

System.out.println ( } }

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( (2) ; } }

class FootDecorator extends Decorator { public FootDecorator(Invoice t){ super(t); }

public void printlnvoice(){ ( 3) ;

Systent.out.println( } }

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!

答案解析：

(1)ticket.printInvoice() (2)super.printInvoice() (3)super.printInvoice()

(4)new HeadDecorator(new FootDecorator(t)) (5)new HeadDecorator(new FootDecorator(NULL))

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