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)
public abstract class Shape { int x; int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } and a class Circle that extends and fully implements the Shape class. Which is correct?()
- A、 Shape s = new Shape(); s.setAnchor(10,10); s.draw();
- B、 Circle c = new Shape(); c.setAnchor(10,10); c.draw();
- C、 Shape s = new Circle(); s.setAnchor(10,10); s.draw();
- D、 Shape s = new Circle(); s->setAnchor(10,10); s->draw();
- E、 Circle c = new Circle(); c.Shape.setAnchor(10,10); c.Shape.draw();
参考答案
更多 “ public abstract class Shape { int x; int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } and a class Circle that extends and fully implements the Shape class. Which is correct?() A、 Shape s = new Shape(); s.setAnchor(10,10); s.draw();B、 Circle c = new Shape(); c.setAnchor(10,10); c.draw();C、 Shape s = new Circle(); s.setAnchor(10,10); s.draw();D、 Shape s = new Circle(); s-setAnchor(10,10); s-draw();E、 Circle c = new Circle(); c.Shape.setAnchor(10,10); c.Shape.draw();” 相关考题
考题
本题中,鼠标在窗口中单击一下,就在单击的位置生成一个小矩形,如果在小矩形上双击鼠标左键,则删除小矩形。 import java.awt.*; import java.awt.event.*; import javax swing.*; class MousePanel extends JPanel extends MouseMo- tionListener {public MousePanel {addMouseListener(new MouseAdapter {public void mousePressed(MouseEvent evt) {int X=evt.getX; int Y=evt.getY; current=find(x,y); if(current0) add(x,y); } public void mouseClicked(MouseEvent evt) {int X=evt.getX; int Y=evt.getY; if(evt.getClickCount=2) {remove(current); } } }); addMouseMotionListener(this); } public void paintComponent(Graphics g) {super.paintComponent; for(int i=0;insquares;i++) draw(g,i); } public int find(int X,int y) (for(int i=0;insquares;i++) if(squares[i].x-SQUARELENGTH/2= x X=squares[i].x+SQuARELENGTH/2 squares[i].Y-SQUARELENGTH/2 =Y y=squares[i].Y+SQUARELENGTH /2) return i ; return-1 ; } public void draw(Graphics g,int i) {g.drawRect(squares[i].X-SQUARE- LENGTH/2。 squares[i].Y-SQUARELENGTH/2, SQUARELENGTH, SQUARELENGTH); } public void add(int X,int Y) {if(nsquaresMAXNSQUARES) {squares[nsquares]=new Point(x,y); current=nsquares ; nsquares++; repaint; } } public void remove(int n) {if(n0 ‖ n=nsquares)return; Nsquares- -; squares[n]=squares[nsquares]; if(current= =n)current= -l; repaint; } public void mouseMoved(MouseEvent evt) {} public void mouseDragged(MouseEvent evt) {} private static final int SQUARELENGTH=10: private static final int MAXNSQUARES=100; private Point[]squares=new Point[MAX- NSQUARES]; private int nsquares=0; private int current=-l; } class MouseFrame. extends JFramc {public MouseFrame {setTitle("java3"); setSize(300,200); addWindowListener(new WindowAdapter {public void windowClosing(WindowEvent e) {System.exit(0); } }); Container contentPane=getContentPane; contentPane.add(MousePanel); } } public class java3 {public static void main(String[]args) {JFrame. frame=new MouseFrame; frame.show; } }
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
以下程序的执行结果是______。 inelude class Sample { public: int x; int y; void
以下程序的执行结果是______。inelude<iostream.h>class Sample{public:int x;int y;void disp( ){cout<<"x="<<x<<",y="<<y<<endl;}};void main( ){int Sample::*pc;Sample s;pc=Sample::x;s.*pc=10;pc=Sample::y;s.*pc=20;s.disp( );}
考题
以下程序的执行结果是【 】。 include class Sample { public: int x: int y; void di
以下程序的执行结果是【 】。include<iostream. h>class Sample{public:int x:int y;void disp(){cout<<"x="<<x<<",y="<<y<<end1;}};void main(){int Sample:: ** pc;Sample s;pc= Sample: :x;s.*pc=10;pc:=Sample: :y;s.*pc=20;s.disp();}
考题
interface A{int x = 0;}class B{int x =1;}class C extends B implements A {public void pX(){System.out.println(x);}public static void main(String[] args) {new C().pX();}}
考题
将下面程序补充完整。 include using namespace std; class Base{ public: 【 】fun(){r
将下面程序补充完整。include <iostream>using namespace std;class Base{public:【 】 fun(){return 0;} //声明虚函数};class Derived:public Base{public:x,y;void SetVal(int a,int b){}int fun(){return x+y;}};void 【 】 SetVal(int a,int b){x=a;y=b;} //类Derived成员函数void main(){Derived d;cout<<d.fun()<<endl;}
考题
下面程序段的输出结果为 package test; public class A { int x=20; static int y=6; public static void main(String args[]) { Class B b=new Class B(); b.go(10); System.out.println(”x=”+b.x); } } class Class B { int x; void go(int y) { ClassA a=new ClassA(); x=a.y; } }A.x=10B.x=20C.x=6D.编译不通过
考题
在下面的例子里using System;class A{public A(){PrintFields();}public virtual void PrintFields(){}}class BA{int x=1;int y;public B(){y=-1;}public override void PrintFields(){Console.WriteLine(x={0},y={1},x,y);}当使用new B()创建B的实例时,产生什么输出?
考题
下面程序输出的结果是( )。 include using namespace std; class A{
下面程序输出的结果是( )。 #include<iostream> using namespace std; class A{ int X; public: A(int x):x(++x){} ~A(){cout<<x;} }; class B:public A{ int y; public: B(int y):A(y),y(y){} ~B(){cout<<y;}; }; void main(){ B b(3); }A.34B.43C.33D.44
考题
有如下程序:include using namespace std;class shapes{protected: int x, y;public:
有如下程序: #include <iostream> using namespace std; class shapes { protected: int x, y; public: void setvalue(int d, int w=O) { x=d; y=w; } virtual void disp()=O; }; class square : public shapes { public: void disp () { cout<<x*y<<end1; } }; int main ( ) { shapes *ptr; square s1; ptr=s1; ptr->setvalue (10, 5) ;ptr->disp(); return 0; } 执行上面的程序将输出( )。A.50B.5C.10D.15
考题
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, int y virtual~DrawCircle() { }}; class RedCircle:public DrawCircle { //绘制红色圆形 public: void drawCircle(int radius, 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,int y,int radius,DrawCircle *drawCircle) (3) { this->x = x; this->y = y; this->radius = radius; } public: void draw() { drawCircle -> (4) ; }}; int main(){ Shape *redCircle=new 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;}
考题
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();? ?}}
考题
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;}
考题
给定java代码如下所示,在A处新增下列()方法,是对cal方法的重载。public class Test { public void cal(int x, int y, int z) { } //A } A、public int cal(int x,int y,float z){return 0;}B、public int cal(int x,int y,int z){return 0;}C、public void cal(int x,int z){}D、public viod cal(int z,int y,int x){}
考题
Which three demonstrate an “is a” relationship?() A、 public class X { } public class Y extends X { }B、 public interface Shape { } public interface Rectangle extends Shape{ }C、 public interface Color { } public class Shape { private Color color; }D、 public interface Species { } public class Animal { private Species species; }E、 public class Person { } public class Employee { public Employee(Person person) { }F、 interface Component { } class Container implements Component { private Component[] children; }
考题
public class X { public X aMethod() { return this;} } public class Y extends X { } Which two methods can be added to the definition of class Y?()A、 public void aMethod() {}B、 private void aMethod() {}C、 public void aMethod(String s) {}D、 private Y aMethod() { return null; }E、 public X aMethod() { return new Y(); }
考题
public class Parent{ public void change(int x){} } public class Child extends Parent{ //覆盖父类change方法 } 下列哪个声明是正确的覆盖了父类的change方法?() A、 protected void change(int x){}B、 public void change(int x, int y){}C、 public void change(String s){}D、 public void change(int x){}
考题
public class ConstOver { public ConstOver (int x, int y, int z) { } } Which two overload the ConstOver constructor?() A、 ConstOver ( ) { }B、 Protected int ConstOver ( ) { }C、 Private ConstOver (int z, int y, byte x) { }D、 Public Object ConstOver (int x, int y, int z) { }E、 Public void ConstOver (byte x, byte y, byte z) { }
考题
Given: 1. public class ConstOver { 2. public constOver(int x, int y, int z) { 3. } 4. } Which two overload the ConstOver Constructor?()A、 ConstOver() {}B、 protected int ConstOver(){}C、 private ConstOver(int z, int y, byte x ) {}D、 public Object ConstOver(Int x, int y, int z) {}E、 pubic void ConstOver (byte x, byte y, byte z) {}
考题
public class MethodOver { private int x, y; private float z; public void setVar(int a, int b, float c){ x = a; y = b; z = c; } } Which two overload the setVar method?()A、 void setVar (int a, int b, float c){ x = a; y = b; z = c; }B、 public void setVar(int a, float c, int b) { setVar(a, b, c); }C、 public void setVar(int a, float c, int b) { this(a, b, c); }D、 public void setVar(int a, float b){ x = a; z = b; }E、 public void setVar(int ax, int by, float cz) { x = ax; y = by; z = cz; }
考题
1. import java.io.*; 2. public class Foo implements Serializable { 3. public int x, y; 4. public Foo( int x, int y) { this.x = x; this.y = y; } 5. 6. private void writeObject( ObjectOutputStream s) 7. throws IOException { 8. s.writeInt(x); s.writeInt(y) 9. } 10. 11. private void readObject( ObjectInputStream s) 12. throws IOException, ClassNotFoundException { 13. 14. // insert code here 15. 16. } 17. } Which code, inserted at line 14, will allow this class to correctly serialize and deserialize?() A、 s.defaultReadObject();B、 this = s.defaultReadObject();C、 y = s.readInt(); x = s.readInt();D、 x = s.readInt(); y = s.readInt();
考题
public abstract class Shape { private int x; private int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } Which two classes use the Shape class correctly?()A、 public class Circle implements Shape { private int radius; }B、 public abstract class Circle extends Shape { private int radius; }C、 public class Circle extends Shape { private int radius; public void draw(); }D、 public abstract class Circle implements Shape { private int radius; public void draw(); }E、 public class Circle extends Shape { private int radius;public void draw() {/* code here */} }F、 public abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }
考题
多选题public class ConstOver { public ConstOver (int x, int y, int z) { } } Which two overload the ConstOver constructor?()AConstOver ( ) { }BProtected int ConstOver ( ) { }CPrivate ConstOver (int z, int y, byte x) { }DPublic Object ConstOver (int x, int y, int z) { }EPublic void ConstOver (byte x, byte y, byte z) { }
考题
多选题Given: 1. public class ConstOver { 2. public constOver(int x, int y, int z) { 3. } 4. } Which two overload the ConstOver Constructor?()AConstOver() {}Bprotected int ConstOver(){}Cprivate ConstOver(int z, int y, byte x ) {}Dpublic Object ConstOver(Int x, int y, int z) {}Epubic void ConstOver (byte x, byte y, byte z) {}
考题
单选题现有 public class Parentt public void change (int x){) ) public class Child extends Parent{ //覆盖父类change方法 } 下列哪个声明是正确的覆盖了父类的change方法?()A
protected void change (int x){}B
public void change(int x, int y){}C
public void change (int x){}D
public void change (String s){}
考题
多选题Which three demonstrate an “is a” relationship?()Apublic class X { } public class Y extends X { }Bpublic interface Shape { } public interface Rectangle extends Shape{ }Cpublic interface Color { } public class Shape { private Color color; }Dpublic interface Species { } public class Animal { private Species species; }Epublic class Person { } public class Employee { public Employee(Person person) { }Finterface Component { } class Container implements Component { private Component[] children; }
考题
多选题public abstract class Shape { private int x; private int y; public abstract void draw(); public void setAnchor(int x, int y) { this.x = x; this.y = y; } } Which two classes use the Shape class correctly?()Apublic class Circle implements Shape { private int radius; }Bpublic abstract class Circle extends Shape { private int radius; }Cpublic class Circle extends Shape { private int radius; public void draw(); }Dpublic abstract class Circle implements Shape { private int radius; public void draw(); }Epublic class Circle extends Shape { private int radius;public void draw() {/* code here */} }Fpublic abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }
热门标签
最新试卷