网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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
考题
阅读以下说明和Java程序，将应填入(n)处的字句写在对应栏内[说明]以下程序的功能时三角形、矩形和正方形的面积输出。程序由5个类组成：areatest是主类，类Triangle，Rectangle和Square分别表示三角形、矩形和正方形，抽象类Figure提供了一个计算面积的抽象方法。[Java程序]public class areatest {public static viod main(string args[]){Figure[]Figures={New triangle(2,3,3),new rectangle(5,8),new square(5)};for(int i=0; i＜Figures.length;i++){system.out.println(Figures+"area="+Figures.getarea());}}}public abstract class figure {public abstract double getarea();}public class rectangle extends (1) {double height;double width;public rectangle (double height,double width){this.height=height;this.width=width;}public string tostring(){return"rectangle:height="+height+",width="+width+":";}public double getarea(){return (2)}}public class square exends (3){public square(double width){(4);}public string tostring(){return"square:width="+width":";}}public class triangle entends (5){double la;double lb;double lc;public triangle(double la,double lb,double lc){this.la=la;this.lb=lb;this.lc=lc;}public string tostring()(return"triangle:sides="+la+","+lb+","+lc+":";}public double get area(){double s=(la+lb+lc)/2.0;return math．sqrt(s*(s-la)*(s-lb)*(s-lc));}}
考题
阅读以下说明和Java源程序，将应填入(n)处的字句写在对应栏内。【说明】以下程序能够计算三角形、矩形和正方形的周长并输出。程序由5个类组成：AreaTest是主类，类Triangle、Rectangle和Square分别表示三角形、矩形和正方形，抽象类Figure提供了一个计算周长的抽象方法。【程序】public class girthTest{public static void main (String args[]){Figure[]figures={new Triangle (2，3，3)，new Rectangle(5，8)，new Square(5)}；for(int i=0；i＜figures．length；i++){System．out．println(figures[i]+"girth="+figures[i]．getGirth())；}}}public abstract class Figure{public abstract double getGirth()；}public class Rectangle extends (1) {double height；double width；public Rectangle(double height，double width){this．height=height；this．width=width；}public String toString(){return "Rectangle：height="+height+"，width="+width+"："；}public double getGirth(){return (2)；}}public class Square extends (3) {public Square(double width){(4)；}public Stdng toString(){return "Square：width='+width+"："；}}public class Triangle extends (5) {double la；double lb；double lc；public Triangle(double la，double lb，double lc){this．la=la；this.lb=lb；this．lc=lc；}public String toString(){return "Triangle：sides=" +la+"，" +lb+"，" +lc+"："；}public double getGirth(){return la+lab+lc；}}
考题
阅读以下说明和Java代码，将应填入(n)处的字句写在对应栏内。【说明】下面的Java程序演示了程序竞争资源(Mutex的实例对象)而引起程序死锁的一种例子。【Java程序】import java．applet．*；import java．awt．*；//此处声明一个互斥类class Mutex { }class A extends (1){private Mutex first，second；public A(Mutex f，Mutex s){first = f；second = s；}public void run(){//锁定first变量(2) (first){try{ //本线程挂起，等待重新调度Thread．sleep(1)； //注意此处(1)不是小题序号}catch(InterruptedException e){}System. out. println("threadA got first mutex")；(2) (second) //锁定second变量{ //do somethingSystem. out. println("threadA got second mutex")；} //释放second变量} //释放first变量}}class B extends (1){private Mutex first，second；public B(Mutex f，Mutex s){(3) ；second = s；}public void run(){(2) (second) //锁定second变量{//do somethingtry{Thread．sleep(((int)(3*Math．random()))*1000)；//本线程挂起，等待重新调度}catch(InterruptedException e){}System．out．println("threadB got second mutex")；(2) (first) //锁定first变量{//do somethingSystem．out．println("threadB got first mutex")；} //释放first变量} //释放second变量}}public class DeadlockExample{public static void main(String arg[]){Mutex mutexX = new Mutex()；Mutex mutexY = new Mutex()；AthreadA = new A(mutexX，mutexY)；B threadB = new B (4)；threadA．(5)；threadB．start()；}}
考题
阅读以下说明和Java代码。[说明]已知类Stock和类JavaMain都定义在JavaMain.java文件中，类Stock的定义中有四处错误，分别在代码的第01、02、06、07行。请修改错误并给出修改后该行的完整代码，并写出改正错误后程序运行的输出结果。[Java代码]01 public class Stock{02 static {03 shares=0;04 share_val=0.0;05 }06 private Stock(){getData();}07 private Stock(int n, double pr=0){08 shares=n;09 share_val=pr;10 getData();11 }12 public void getData(){13 System.out.print(shares+":"+share_val+"");14 }15 private int shares; //非静态变量16 private double share_val; //非静态变量17 };1819 public class JavaMain{20 public static void main(String args[]){21 Stock a=new Stock();22 Stock b=new Stock(1,67.5);23 //其它代码省略，且代码无输出24 }25 }
考题
阅读下列Java程序和程序说明，将应填入(n)处的字句写在对应栏内。【说明】下面的程序先构造Point类，再顺序构造Ball类。由于在类Ball中不能直接存取类Point中的xCoordinate及yCoordinate属性值，Ball中的toString方法调用Point类中的toString方法输出中心点的值。在MovingBall类的toString方法中，super.toString调用父类Ball的toString方法输出类Ball中声明的属性值。public class Point{private double xCoordinate;private double yCoordinate;public Point 0 }public Point(ouble x, double y){xCoordinate = x;yCoordinate = y;}public String toString(){return "( + Double.toString(Coordinate)+ ","+ Double.toString(Coordinate) + ");}//other methods}public class Ball{(1); //中心点private double radius; //半径private String colour; ///颜色public Ball() { }public Ball(double xValue, double yValue, double r)// 具有中心点及半径的构造方法{center=(2);//调用类Point 中的构造方法radius = r;}public Ball(double xValue, double yValue, double r, String c)// 具有中心点、半径及颜色的构造方法{(3)；//调用3个参数的构造方法colour = c;}public String toString(){return "A ball with center" + center, toString() + ", radius"+ Double.toString(radius) + ", colour" + colour;}//other methods}public class MovingBall. (4){private double speed;public MovingBall() { }public MovingBall(double xValue, double yValue, double r, String e, double s){(5);// 调用父类Ball中具有4个参数的构造方法speed = s;}public String toString( ){ return super, toString( ) + ", speed "+ Double.toString(speed); }//other methods}public class Tester{public static void main(String args[]){MovingBall mb = new MovingBall(10,20,40,"green",25);System.out.println(mb);}}
考题
阅读以下说明和Java代码，将应填入(n)处的字句写在对应栏内。【说明】下面代码里，instr是一个抽象类，它被两个子类wind和rain分别实现，而brass又继承了wind类，并覆盖了play方法。【程序】(1) class instr{(2) Void play();}class wind (3) instr{void play(){System.out.println("wind play!");}}class rain extends instr {void play(){System.out.println("rain play!");}}class brass extends (4) {void play(){System.out.println("brass play!"));}}public class music{static void tuneAll(instr e[]){for(int i=0;i＜e.length;i++)e[i].play();}public (5) void main(String[]args){instr orch[]=new instr[3];int i=0;orch[i++]=new wind();orch[i++]=new rain();orch[i++]=new brass();tuneAll(orch);}}
考题
试题八（共15分）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！[Java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 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();}}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();
考题
阅读以下说明和JAVA2代码，将应填入(n)处的字句写在对应栏内。【说明】以下程序实现了利用鼠标任意移动该圆形的位置，仔细阅读代码和相关注释，将程序补充完整。【代码6】import java.awt.*;import java.awt.event.*;public class CIUSAMPLE extends Frame. implements MouseMotionListener, MouseListener{static CIUSAMPLE frm=new CIUSAMPLE ();int x=70,y=60,posX=70,posY=60,dx,dy;public static void main ( String args[]){frm.setTitle ("Dragging a circle");frm.setSize ( 200,150 );(1)frm.addMouseMotionListener ( frm );frm. setVisible ( true );}public void mousePressed ( MouseEvent e ){(2)dy=e.getY () -posY;}public void mouseDragged ( MouseEvent e ){(3)y=e.getY () -dy;if ( dx＞0 dx＜50 dy＞0 dy＜50 ) //如果指我落在正方形区域内{Graphics g=getGraphics ();(4)}}public void paint ( Graphics g ){g.setColor ( Color. pink ); // 设置绘图颜色为粉红g.fillOval ( x,y,50,50 ); //以基准点为图形的左上角绘出圆形(5)posY=y;}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、Java代码和HTML文档，将应填入(n)处的字句写在答题纸的对应栏内。【说明】当用户启动html浏览器并首次打开下面的HTML文档时，Java Applet小程序在显示面板上显示字符串“Welcome!”；当html页面被其他窗口遮挡后再次显示时，小程序在显示面板上显示“Welcome back!”。【Java代码】import javA．awt．*；import javA．applet；public class HelloApplet extends (1) {public void paim((2)){g．drawString(message,10,20)；message="welcome back!”；}public void (3) (){message="Welcome!”；}private (4) message；}【HTML文档】＜html＞＜head＞＜title＞HTML Test HelloApplet Page＜/title＞＜/head＞＜body＞Test HelloApplet小程序＜br＞＜appletcodebase="."code="(5) "name="TestApplet"width="400"height="300"＞＜/applet＞＜/body＞＜/html＞
考题
阅读以下说明和C++代码，填入(n)处。[说明]以下C++代码使用虚函数实现了同一基类shape派生出来的Class rectangle、Class triangle、Class circle实现了计算矩形、圆形面积的计算。仔细阅读以下代码，将(n)处语句补充完整。[代码5-1]include＜iostream.h＞define PI 3.14159class shape {//基类protected：(1)；public：(2)；(3)；}；[代码5-2]class rectangle: public shape {public:rectangle (int x2,int y2,int r2): (4) {};double area ( ) {return x*y; };};class circle: public shape {public:circle (int x3,int y3,int r3):(5){};double area ( ) {return r*r*PI; };};[代码5-3]void main ( ){rectangle r (10,20,0);circle c (0,0,30);shape (6)；cout＜＜"长方形面积="＜＜s1-＞area ( ) ＜＜endl；cout＜＜"圆形面积="＜＜s2-＞area ( ) ＜＜endl；}[运行结果]长方形面积=200圆形面积=2827.43
考题
阅读以下函数说明和Java代码，将应填入(n)处的字句写在对应栏内。【说明】现要编写一个画矩形的程序，目前有两个画图程序：DP1和DP2，DP1用函数draw_a_line(x1，y1，x2，y2)画一条直线，DP2则用drawline(x1，x2，y1，y2)画一条直线。当实例画矩形时，确定使用DP1还是DP2。为了适应变化，包括“不同类型的形状”和“不同类型的画图程序”，将抽象部分与实现部分分离，使它们可以独立地变化。这里，“抽象部分”对应“形状”，“实现部分”对应“画图”，与一般的接口(抽象方法)与具体实现不同。这种应用称为Bridge(桥接)模式。图9-6显示了各个类间的关系。这样，系统始终只处理3个对象：Shape对象、Drawing对象、DP1或DP2对象。以下是 Java语言实现，能够正确编译通过。【Java代码】//DP1.java文件public class DP1{static public void draw_a line(double x1,double y1,double x2,double y2){//省略具体实现}}//DP2.java文件public class DP2{static public void drawline(double x1,double y1,double x2,double y2){//省略具体实现}}//Drawing.java文件(1) public class Drawing{abstract public void drawLine(double x1, double y1, double x2, double y2);}//V1Drawing.java文件public class V1Drawing extends Drawing{public void drawLine(double x1, double y1, double x2, double y2){DP1.draw_a_line(x1,y1,x2,y2);}}//V2Drawing.java文件public class V2Drawing extends Drawing{public void drawLine(double x1,double y1,double x2, double y2)(//画一条直线(2);}}//Shape.java文件abstract public class Shape{abstract public void draw();private (3) _dp;Shape(Drawing dp){_dp=dp;}protected void drawLine(double x1,double y1,double x2, double y2){(4);}}//Rectangle.java文件public class Rectangle extends Shape{private double_x1,_x2,_y1,_y2;public Rectangle(Drawing dp,double x1,double y1,double x2,double y2){(5);_x1=x1;_x2=x2;_y1=y1;_y2=y2;}public void draw(){//省略具体实现}}
考题
阅读以下函数说明和Java代码，将应填入(n)处的字句写在对应栏内。【说明】下面的程序先构造Point类，再顺序构造Ball类。由于在类Ball中不能直接存取类Point中的xCoordinate及yCoordinate属性值，Ball中的toString方法调用Point类中的toStrinS方法输出中心点的值。在MovingBsll类的toString方法中，super.toString调用父类Ball的toString方法输出类Ball中声明的属性值。【Java代码】//Point.java文件public class Point{private double xCoordinate;private double yCoordinate；public Point(){}public Point(double x,double y){xCoordinate=x;yCoordinate=y;}public String toStrthg(){return"("+Double.toString(xCoordinate)+","+Double.toString(yCoordinate)+")";}//other methods}//Ball.java文件public class Ball{private (1);//中心点private double radius;//半径private String color;//颜色public Ball(){}public Ball(double xValue, double yValue, double r){//具有中心点及其半径的构造方法center=(2);//调用类Point中的构造方法radius=r;}public Ball(double xValue, double yValue, double r, String c){//具有中心点、半径和颜色的构造方法(3);//调用3个参数的构造方法color=c;}public String toString(){return "A ball with center"+center.toString()+",radius "+Double.toString(radius)+",color"+color;}//other methods}class MovingBall (4) {private double speed;public MovingBall(){}public MoyingBall(double xValue, double yValue, double r, String c, double s){(5);//调用父类Ball中具有4个参数的构造方法speed=s;}public String toString(){return super.toString()+",speed"+Double.toString(speed);}//other methods}public class test{public static void main(String args[]){MovingBall mb=new MovingBall(10,20,40,"green",25);System.out.println(mb);}}
考题
阅读以下说明、Java代码和HTML文档，将应填入(n)处的字句写在对应栏内。【说明】当用户启动html浏览器并首次打开下面的html文档时，Java Applet小程序在显示面板上显示字符串“欢迎您!”；当html页面被其他窗口遮挡后再次显示时，小程序在显示面板上显示“欢迎您回来!”[Java代码]import java．awt．*；import java．applet．*；public class HelloApplet extends (1) {public void paint( (2) ){g.drawString(message，10，20)；message="欢迎您回来!"；}public void (3) (){message="欢迎您!"；}private (4) message；}[HTML文档]＜html＞＜head＞＜title＞HTML Test HelloApplet Page＜/title＞＜/head＞＜body＞Test HenoApplet 小程序＜br＞＜appletcodebase="."code="(5)"name="TestApplet"width="400"height="300"＞＜/applet＞＜/body＞＜/html＞
考题
阅读以下说明和Java代码，回答问题1和问题2，将解答填写在对应栏内。【Java代码】class usethread implements (1) {int numusethread(int n){num=n;}public void (2) {for(int i=0;i＜3;i++)System.out.println("running:"+num);System.out.println("finished:"+num);}public class multhread{public static void main(String args[]) (3) InterruptedException{Thread m1=new Thread(new usethread(1));Thread m2=new Thread(new usethread(2));m1.start();m2.start();m1.join();m2.join();}}【问题1】补充完整上面Java代码中(n)处。【问题2】写出上面Java代码运行的结果。
考题
阅读以下说明和Java源程序，将应填入(n)处的字句写在答题纸的对应栏内。说明以下程序的功能是计算三角形、矩形和正方形的面积并输出。程序由5个类组成：AreaTest是主类，类Triangle、Rectangle和Square分别表示三角形、矩形和正方形，抽象类Figure提供了一个计算面积的抽象方法。程序public class AreaTest{public static void main(String args[]){Figure[]figures={new Triangle(2,3,3)，new Rectangle(5,8)， new Square(5)}；for(int i=0；i＜figures．1ength；i++){System.out.println(figures[i]+"area="+figures[i]．getArea())；}}}public abstract class Figure{public abstract double SetAJea()；public class Rectangle extends (1) {double height;double width;public Rectangle(double height,double width){this.height=height;this.width=width;}public String toString(){return "Rectangle:height="+height+",width="+width+":";}public double getArea() { return (2);} } public class Square extends (3) {public Square(double width) {(4);}public String toString() {return "Square:width="+width+":";} } public class Triangle extends (5). {double la;double lb;double lc;public Triangle(double la,double lb,double lc) {this.la=la; this.lb=lb; this.lc=lc;public String toString(){return "Triangle: sides="+la+","+lb+","+lc+":";public double getArea() {double s=(la+lb+lc)/2.0;return Math.sqrt(s*(s-la)*(s-lb)*(s?1c))；}}
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();? ? ? ??
}
热门标签
最新试卷