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阅读以下说明和JAVA 2代码，将应填入(n)处的字句写在对应栏内。
[说明]
以下程序为类类型的变量应用实例，通过异常处理检验了类CCircle的变量的合法性，即参数半径应为非负值。仔细阅读代码和相关注释，将程序补充完整。
[JAVA代码]
//定义自己的异常类
class CCircleException extends Exception
{
}
// 定义类 CCircle
class CCircle
{
private double radius;
public void setRadius ( double r ) (1)
{
if ( r＜0 ) {
(2)
}
else
(3)
}
Public void show ( ) {
System. out. println ( "area="+3.14*radius*radius );
}
}
public class ciusample
{
public static void main ( String args[] )
{
CCircle cir=new CCircle( );
(4) {
cir. setRadius ( -2.0 )
}
(5)
{
System. out. println ( e+" throwed" ) ;
}
cir. show( ) ;
}
}
参考答案
更多 “ 阅读以下说明和JAVA 2代码，将应填入(n)处的字句写在对应栏内。[说明]以下程序为类类型的变量应用实例，通过异常处理检验了类CCircle的变量的合法性，即参数半径应为非负值。仔细阅读代码和相关注释，将程序补充完整。[JAVA代码]//定义自己的异常类class CCircleException extends Exception{}// 定义类 CCircleclass CCircle{private double radius;public void setRadius ( double r ) (1){if ( r＜0 ) {(2)}else(3)}Public void show ( ) {System. out. println ( "area="+3.14*radius*radius );}}public class ciusample{public static void main ( String args[] ){CCircle cir=new CCircle( );(4) {cir. setRadius ( -2.0 )}(5){System. out. println ( e+" throwed" ) ;}cir. show( ) ;}} ” 相关考题
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考题
阅读以下说明和Jrdva代码，将应填入(n)处的字句写在对应栏内。[说明]在销售系统中常常需要打印销售票据，有时需要在一般的票据基础上打印脚注。这样就需要动态地添加一些额外的职责。如下展示了Decorator(修饰)模式。SalesOrder对象使用一个SalesTicket对象打印销售票据。图6-1显示了各个类间的关系。以下是Java语言实现，能够正确编译通过。[图6-1][Java代码]//Component.java文件public (1) class Component {abstract publ ic void prtTicket()；}//salesTicket.java文件public class SalesTicket extends Component{public void prtTicket(){//Sales ticket printing code hereSystem.out.printin("SalesTicket")；}}//Decorator.java文件publ ic abstract class Decorator extends Component{public void prtTicket(){if(myComp!=null)myComp.prtTicket()；}private (2) myComp；public Decorator(Component myC){myComp=myC；}}//Footer.java文件public class Footer extends Decorator {public Footer(Component myC){(3)；}public void prtTicket(){(4)；prtFooter()；}publ ic void prtFooter(){//place printing footer code hereSystem.out.println("Footer")；}}//salesorder.java文件public class SalesOrder{void prtTicket(){Component myST；myST=new Footer( (5) )；//Print Ticket with footers as neededmyST.prtTicket()；}}(1)
考题
阅读以下说明和JAVA 2代码，填入(n)处的。[说明]以下JAVA程序实现了在接口interface iShape2D的定义和应用，仔细阅读代码和相关注释，将程序补充完整。[代码6-1]interface iShape2D //定义接口{(1)(2)}(3)//实现CRectangle类{int width, height；(4) CRectangle (int w,int h) {width=w;height=h;}public void area ( ){ //定义area( )的处理方式System. out.println ("area="+width*height);}}(5)//实现CCircle类{double radius;(6) CCircle (double r) {radius=r；}public void area ( ) { //定义area( )的处理方式System.out.println ("area="+pi*radius*radius);}}[代码6-2]public class app10_4{public static void main(String args[]){CRectangle rect=new CRectangle (5,10);rect.area ( )； //调用CRectangle类里的area ( ) methodCCircle cir=new CCircle (2.0);cir.area ( ); //调用CCircl类里的area ( ) method}}
考题
阅读以下说明和C++程序，将应填入(n)处的字句写在对应栏内。【说明】以下程序的功能是计算正方体、球体和圆柱体的表面积和体积并输出。程序由4个类组成：类cube、sphere和cylinder分别表示正方体、球体和圆柱体；抽象类 container为抽象类，提供了两个纯虚拟函数surface_area()和volum()，作为通用接口。【C++程序】include＜iostream.h＞define pi 3.1416class container｛protected:double radius;public:container(double radius) {container::radius=radius;}virtual double surface_area()=0;virtual double velum()=0;};class cube:(1){ //定义正方体类public:cube(double radius):container(radius){};double surface_area () {return 6 * radius * radius;}double volum() {return radius * radius * radius;}};class sphere:(2){ //定义球体类public:sphere(double radius): container(radius){};double surface_area() { return (3);}double volum() {return pi * radius * radius * radius * 4/3;}};class cylinder:(4){ //定义圆柱体类double height;public:cylinder(double radius,double height):container(radius){container::height=height;}double surface_are a () { return 2 * pi * radius * (height+radius); }double volum () {return (5);}};void main(){container * p;cube obj1 (5);sphere obj2(5);cylinder obj3(5,5);p=obj1;cout＜＜“正方体表面积”(＜＜p-＞surface_area()＜＜end1;cont＜＜“正方体体积”＜＜p-＞volume()＜＜end1;p=obj2;cout＜＜“球体表面积”＜＜p-＞surface_area()＜＜end1;cout＜＜“球体体积”＜＜p-＞volume()＜＜end1;p=obj3;cout＜＜“球体表面积”＜＜p-＞surface_area()＜＜end1;cout＜＜“球体体积”＜＜p-＞volume()＜＜end1;}
考题
阅读以下说明和Java以及HTML代码，将应填入(n)处的字句写在对应栏内。[说明]编写一个Applet程序，接受HTML文件传递的整数参数，根据该参数指定Applet中文本框的长度。编写对应的HTML文件运行这个Applet。[Java 代码]import java. applet.*；import java. awt.*；public class chuangdics extends (1){TextField tf=new TextField ()；int tfLength=0；public void init(){try{tfLength=Integer. parseInt( (2) ("length"))；tf. setColumns (tfLength)；add (tf)；}catch (NumberFormatException nfe){tf. (3) ("HTML 文件传人的参数格式错误。")；add(tf)；}}}[HTML 代码]＜html＞＜head＞＜title＞(4)＜/title＞＜/head＞＜body＞＜hr＞＜applet code=chuangdics width=700 height=150＞＜param name=length value=20＞(5)＜hr＞＜/body＞＜/htmI＞
考题
阅读以下说明和JAVA 2代码，将应填入(n)处的字句写在对应栏内。[说明]以下程序实现了在applet里移动图形文件，仔细阅读代码和相关注释，将程序补充完整。[代码6-1]import j ava. awt. *;import j ava.awt.event.*;import java.applet. Applet;public class AppCIU extends Applet implements MouseMotionListener, MouseListener{Image IMG nClick=over(this) title=放大; // 声明 Image 类类型的变量 IMG nClick=over(this) title=放大int x=70,y=60,posX=70,posY=60,dx,dy;public void init ( ){IMG nClick=over(this) title=放大=getImage ( getCodeBase ( ) ,"mouse.gif" ); //载入影像addMouseListener ( this );addMouseMotionListener ( this );}public void mousePressed ( MouseEvent e ){dx=e.getX()-posX； //取得按下之点与基准点X方向的距离dy=e.getY()-posY； //取得按下之点与基准点Y方向的距离}public void mouseDragged ( MouseEvent e ){(1)(2)if ( dx＞0 dx＜120 dy＞0 dy＜60 ) //如果指针落在图形上方{Graphics g=getGraphics ( );(3)}}public void paint ( Graphics g ){(4)(5)(6)}public void mouseMoved ( MouseEvent e ) {};public void mouseReleased ( MouseEvent e ) {};public void mouseEntered ( MouseEvent e ) {};public void mouseExited ( MouseEvent e ) {};public void mouseClicked ( MouseEvent e ) {};}
考题
阅读以下说明和Visual Basic代码，将应填入(n)处的字句写在答题纸的对应栏内。【说明】某绘图系统定义了一个抽象类IShape，现有三个类CPoint、CLine和CCircle，它们都具有IShape界面。相应的类图关系如图7-1所示。已知某第三方库已经提供了XCircle类，且完全满足CCircle图元显示时所需的功能。代码7-1是抽象类IShape的类模块内容，代码7-2实现了类CCircle的IShape界面，并使用了XCircle提供的显示功能。XCimle提供的显示功能方法接口为displayIt。【代码7-1】Public Color As LongSub draw()'方法体不包括可执行语句End SubSub move(stepx As Single，stepy As Smgle)'方法体不包括可执行语句End Sub【代码7-2】(1)Private color As Long… ‘其他定义省略Private bridged As (2)Private Sub Class_Initialize ( )Set bridged=(3)End SubPrivate Property (4) ( )As LongIShape_Color = colorEnd PropertyPrivate Property (5) (ByVal newColor As Long)color=newColorEnd PropertyPrivate Sub IShape_draw ( ) '使用XCirele提供的显示功能(6)End SubPrivate Sub IShape_move (stepx As Single, stepy As Single)… '省略描述End Sub
考题
阅读以下说明和Java程序代码，将应填入(n)处的字句写在答题纸的对应栏内。【说明】在下面的Java程序代码中，类SalesTicket能够完成打印票据正文的功能，类 HeadDecorator与FootDecorator分别能够完成打印票据的台头和脚注的功能。已知该程序运行后的输出结果如下所示，请填补该程序代码中的空缺。这是票据的台头!这是票据正文!-------------------这是票据的脚注!这是票据的台头!这是票据的脚注!【tava程序代码】public class SalesTicket {public void printTicket() {System. out. println ( "这是票据正文 ! ");}}public class Decorator extends SalesTicket{SalesTicket ticket;public Decorator(SalesTicket t) {ticket = t;}public void printTicket(){if(ticket != null)ticket.printTicket();}public class HeadDecorator extends Decorator{public HeadDecorator(SalesTicket t) {(1)}public void printTicket() {System. out.println("这是票据的台头! ");super.printTicket();}}public class FootDecorator extends Decorator{public FootDecorator(SalesTicket t) {(2);}public void printTicket() {super, printTicket ();System. out.println ("这是票据的脚注!");}}public class Main {public static void main(String[] args) {T = new HeadDecorator( (3));T=(4);System.out.println("------------------------------------");T = new FootDecorator((5));T.printTicket ();}}
考题
第五题 阅读以下说明和Java代码，填补代码中的空缺，将解答填入答题纸的对应栏内。
【说明】
以下Java代码实现一个超市简单销售系统中的部分功能，顾客选择图书等物件 (Item)加入购物车(ShoppingCart)，到收银台(Cashier)对每个购物车中的物品统计其价格进行结账。设计如图5-1所示类图。
问题：5.1 【Java代码】
interface Item{
public void accept(Visitor visitor);
public double getPrice();
}
class Book （1）{
private double price;
public Book(double price){（2）;}
public void accept(Visitor visitor){ //访问本元素
（3）;
}
public double getPrice() {
return price;
}
}
//其它物品类略
interface Visitor {
public void visit(Book book);
//其它物品的visit方法
}
class Cashier（4）{
private double totalForCart;
//访问Book类型对象的价格并累加
（5）{
//假设Book类型的物品价格超过10元打8折
if(book.getPrice() totalForCart+=book.getPrice();
} else
totalForCart+=book.getPrice()*0.8;
}
//其它visit方法和折扣策略类似，此处略
public double getTotal() {
return totalForCart;
}
}
class ShoppingCart {
//normal shopping cart stuff
private java.util.ArrayListitems=new java.util.ArrayList<>();
public double calculatePrice() {
Cashier visitor=new Cashier();
for(Item item:items) {
（6）;
}
double total=visitor.getTotal();
return total;
}
public void add(Item e) {
this.items.add(e);
}
}
考题
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】某软件公司欲开发一款汽车竞速类游戏，需要模拟长轮胎和短轮胎急刹车时在路面上留 下的不同痕迹，并考虑后续能模拟更多种轮胎急刹车时的痕迹。现采用策略（Strategy）设计模式来实现该需求，所设计的类图如图 5-1 所示。
【Java代码】import java.util.*; interface BrakeBehavior{public （1） ;/*其余代码省略*/}class LongWheelBrake implements BrakeBehavior{public void stop(){System.out.println("模拟长轮胎刹车痕迹! ");}/*其余代码省略*/}class ShortWheelBrake implements BrakeBehavior {public void stop(){System.out.println("模拟短轮胎刹车痕迹! ");}/*其余代码省略 */}abstract class Car{protected （2） wheel;public void brake(){ （3） ;}/*其余代码省略*/}class ShortWheelCar extends Car {public ShortWheelCar(BrakeBehavior behavior){（4） ; } /*其余代码省略*/}class StrategyTest{public static void main(String[]args){BrakeBehaviorbrake =new ShortWheelBrake();ShortWheelCar car1= new ShortWheelCar(brake);car1. （5） ;}}
考题
阅读以下说明和Java代码，填补代码中的空缺，将解答填入答题纸的对应栏内。
【说明】
以下Java代码实现一个超市简单销售系统中的部分功能，顾客选择图书等物件 (Item)加入购物车(ShoppingCart)，到收银台(Cashier)对每个购物车中的物品统计其价格进行结账。设计如图5-1所示类图。
【Java代码】
interface Item{ public void accept(Visitor visitor); public double getPrice();}class Book （1）{ private double price; public Book(double price){（2）;} public void accept(Visitor visitor){ //访问本元素 （3）; } public double getPrice() { return price; }}//其它物品类略 interface Visitor { public void visit(Book book); //其它物品的visit方法 } class Cashier（4）{ private double totalForCart; //访问Book类型对象的价格并累加 （5）{ //假设Book类型的物品价格超过10元打8折 if(book.getPrice()(); public double calculatePrice() { Cashier visitor=newCashier(); for(Item item:items) { （6）; } doubletotal=visitor.getTotal(); return total; } public void add(Item e) { this.items.add(e); }}
考题
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】 某文件管理系统中定义了类OfficeDoc和DocExplorer，当类OfficeDoc发生变化时，类DocExplorer的所有对象都要更新其自身的状态，现采用观察者（Observer）设计模式来实现该需求，所设计的类图如图6-1所示。
考题
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】
生成器( Builder)模式的意图是将一个复杂对象的构建与它的表示分离,使得同样的构建过程可以创建不同的表示。图 6-1 所示为其类图。
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】
???? 生成器（Builder）模式的意图是将一个复杂对象的构建与它的表示分离，使得同样的构建过程可以创建不同的表示。图5-1所示为其类图。
?
【C++代码】
#include
#include
using namespace std;
class Product {
private:?
string partA, partB;
public:?
Product() {?? }? ?
void setPartA(const string}
???? void setPartB(const string}? ?
//? 其余代码省略
};
class Builder {
public:? ? ??
（1）??
;?
virtual void buildPartB()=0;? ? ?
（2）??
;
};
class ConcreteBuilder1 : public Builder {
private:?
Product*?? product;
public:
ConcreteBuilder1() {product = new Product();???? }
void buildPartA() {????? （3）???? ("Component
A"); }?
void buildPartB() {????? （4）???? ("Component
B"); }??
Product* getResult() { return product; }
//? 其余代码省略
};
class ConcreteBuilder2 : public Builder {? ??? ? ? ?
/*??? 代码省略??? */
};
class Director {
private:? ??
Builder* builder;
public:??
Director(Builder* pBuilder) { builder= pBuilder;}? ??
void construct() {
????????????????? （5）???? ;
?????????????? //? 其余代码省略? ?
}??
//? 其余代码省略
};
int main() {? ? ??
Director* director1 = new Director(new ConcreteBuilder1());? ?
director1->construct();? ? ??
delete director1;? ? ?
return 0;
【Java代码】
import jav（6）A.util.*;
class Product {? ? ? ?
private String partA;? ? ? ?
private String partB;? ? ? ??
public Product() {}? ? ??
public void setPartA(String s) { partA = s; }? ? ? ?
public void setPartB(String s) { partB = s; }
}
interface Builder {? ?
public?????? （1）???? ;? ??
public void buildPartB();? ? ??
public?????? （2）???? ;
}
class ConcreteBuilder1 implements Builder {? ? ? ?
private Product product;? ? ? ?
public ConcreteBuilder1() { product = new Product();?? }? ? ? ??
public void buildPartA() {????????
（3）??
("Component A"); }
public void buildPartB() {???? ????（4）?? ("Component B"); }? ? ??
public Product getResult() { return product;}
}
class ConcreteBuilder2 implements Builder {?? ? ? ? ?
//? 代码省略
}
class Director {? ? ? ?
private Builder builder;? ? ? ?
public Director(Builder builder) {this.builder = builder; }
public void construct() {
? ? ? ? ? ? ? ? ? （5）???? ;
? ? ? ? ? ? ? //? 代码省略? ? ??
}
}
class Test {? ? ??
public static void main(String[] args) {
???????????????? Director director1 = new
Director(new ConcreteBuilder1());
???????????????? director1.construct();? ? ? ??
}
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