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[问答题] 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。中级软件设计师,章节练习,系统开发和运行知识【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;} publicvoid 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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