阅读下列代码片段Class InterestTest________ActionListener{Public void actionPerformed (ActionEvent event) {Double interest = balance * rate/100;Balance += interest;Number Format format =Number Format.getCurrencyInstance ();System.out.printlb{ “ balance = ” +Format

阅读下列说明和C++-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5-1所示的类图。

【C++代码】
#include

using
namespace std;
class Invoice{
public:
（1） {
cout<<"This is the content of the
invoice!"< }
};
class
Decorator : public Invoice {
Invoice *ticket;
public:
Decorator(lnvoice *t) { ticket = t; }
void printInvoice（ ）{
if(ticket != NULL)
（2）;
}
};
class
HeadDecorator : public Decorator{
public:
HeadDecorator(lnvoice*t): Decorator(t) { }
void printInvoice（ ） {
cout<< "This is the
header of the invoice! "<< endl;
（3） ;
}
};
class FootDecorator : public Decorator{
public:
FootDecorator(Invoice *t): Decorator(t) { }
void printlnvoice（ ）{
（4） ;
cout<< "This is the
footnote of the invoice!"<< endl;
}
};
int main(void)
{
Invoice t;
FootDecorator f(&t);
HeadDecorator h(&f);
h.printInvoice（ ）;

cout<<”------------------------”< FootDecorator a(NULL) ;

HeadDecorator b( （5） );
b.printInvoice（ ）;
return 0;
}
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!

阅读以下说明和Java程序，填写程序中的空（1）～（6），将解答写入答题纸的对应栏内。
【说明】
以下Java代码实现一个简单绘图工具，绘制不同形状以及不同颜色的图形。部分接口、类及其关系如图5－1所示。




【Java代码】
interface?DrawCircle?{? //绘制圆形 public（1） ；}class?RedCircle?implements?DrawCircle?{? ?//绘制红色圆形???????public?void?drawCircle(int?radius,intx,?int?y)??{????????????System.out.println("Drawing?Circle[red,radius:"?+?radius?+",x:"?+?x?+?",y:"?+y+?"]");???????}}class?GreenCircle?implements?DrawCircle?{????//绘制绿色圆形??????public?void?drawCircle(int?radius,?int?x,int?y)?{???????????System.out.println("Drawing?Circle[green,radius:"?+radius+",x:?"?+x+?",y:?"?+y+?"]");??????}}abstract?class?Shape?{????//形状? protected? ? （2）???;? ? public?Shape(DrawCircle?drawCircle)?{? ?this.drawCircle=?drawCircle;? ? ? public?abstract?void?draw();}class?Circle?extends?Shape?{? //圆形? ?private?int?x,y,radius;? public?Circle(int?x,int?y,intradius,DrawCircle?drawCircle)?{? ?（3）???;? this.x?=?x;? ? ? this.y?=?y;? ?this.radius?=radius;? }? ? ?public?void?draw()?{? ? drawCircle.? ?（4）? ?;? ? ? }}public?class?DrawCircleMain?{? public?static?void?main(String[]?args)?{? Shape?redCircle＝new?Circle(?100,100,10,? （5） )；//绘制红色圆形? Shape?greenCircle＝new?Circle(200,200,10,（6） )；//绘制绿色圆形? ?redCircle.draw(); greenCircle.draw();? ?}}

阅读下列说明和C++代码，填写程序中的空（1）～（6），将解答写入答题纸的对应栏内。
【说明】
以下C++代码实现一个简单绘图工具，绘制不同形状以及不同颜色的图形。部分类及其关系如图6－1所示。



【C++代码】
#include?#include?using?namespace?std;class?DrawCircle?{??????//绘制圆形，抽象类? ? ? public: （1）；//定义参数为?int?radius,?int?x,?inty? ?virtual～DrawCircle()?{?}};class?RedCircle：public?DrawCircle?{????//绘制红色圆形? ? ? ? public: void?drawCircle(intradius,?int?x,?int?y)?{cout?<?drawCircle?=?drawCircle;? }? ?virtual～shape()?{?}? public:? ?virtual?void?draw()?=?0;};class?Circle：public?Shape?{????//圆形? ? private:? ? ?int?x,y,radius;? ? public:? Circle(int?x,inty,int?radius,DrawCircle?*drawCircle)? （3）? {? this->x?=?x;? ?this->y?=?y;? ? this->radius?=?radius; }? ? ? public:? void?draw(){? drawCircle?-> （4）; }};int?main(){Shape?*redCirclenew?Circle(100,100,10,????（5）????);//绘制红色圆形? Shape?*greenCircle＝new?Circle(100,100,10, （6）??);//绘制绿色圆形redCircle >draw();? ?greenCircle?->draw();? ?return?0;}