() has a ticket punched “belief”. A、Billy##the girlB、the hero boyC、know-it-all boy
() has a ticket punched “belief”.
A、Billy##the girl
B、the hero boy
C、know-it-all boy
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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。【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; } 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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