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 

题目
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?()
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 */ } }


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更多“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 ”相关问题
  • 第1题:

    若有以下程序:includeusing namespace std;class A{private:inta;public:voidseta(in

    若有以下程序: #include <iostream> using namespace std; class A { private: int a; public: void seta(int x) { a=x; } void showa() { cout<<a<<","; } }; class B { private: int b; public: void setb (int x) { b=x; } void showb() { cout<<b<<","; } }; class C :public A,private B { private: int c; public: void setc(int x, inc y, int z) { c=z; seta (x); setb (y); } void showc() { showa (); showb (); cout<<c<<end1; } }; int main () { C c; c. setc(1,2,3); c.showc(); return 0; } 程序执行后的输出结果是

    A.1,2,3

    B.1,1,1

    C.2,2,2

    D.3,3,3


    正确答案:A
    解析:本题考核派生类的应用。本题中类A和类B都是基类。而类C从类A公有派生,从类B处私有派生.所以类C中的函数成员可以访问类A和类B中的公有成员。在类C的函数成员setc中,调用基类A的函数成员seta对A的数据成员a赋值,还调用了基类B的函数成员setb对类B的数据成员b赋值,然后对类C自己的数据成员c赋值。在类C的函数成员showc中,调用基类A的函数成员showa显示数据成员a的值,还调用基类B的函数成员showb显示数据成员b的值,然后输出类C自己的数据成员c的值.在主函数main中,先定义派生类的对象c,然后调用setc对c中的数据成员赋值,然后输出赋值结果。所以程序最后输出应该为:1,2,3。

  • 第2题:

    若有以下程序:include using namespace std;class point{private: int x, y;public:

    若有以下程序: #include <iostream> using namespace std; class point { private: int x, y; public: point ( ) { x=0; y=0; } void setpoint(int x1,int y1) { x=x1; y=y1;

    A.12,12

    B.5,5

    C.12,5

    D.5,12


    正确答案:D
    解析:本题考核对象指针的定义与使用。分析程序:程序首先定义一个类point。类point中有两个私有成员,整型变量x和y,还有两个公有成员函数setpoint(intx1,inty1)和dispoint()。函数setpoint()用来设置私有成员x和y的值,而函数dispoint()用来显示私有成员x和y的值。主函数中,首先定义了类point的指针对象p,并申请了内存空间,然后调用对象p中公有成员setpoint给对象p中的私有成员x和y赋值,然后调用成员函数dispoint显示x和y的值。由此可知,最后输出的值应该是5,12。

  • 第3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();? ?}}


    答案:
    解析:
    (1)void drawCircle (int radius,int x,int y)
    (2)DrawCircle drawCircle
    (3)super.drawcircle=drawcircle
    (4)drawCircle(radius,x,y)
    (5)new RedCircle()
    (6)new GreenCircle()【解析】
    第一空是填接口里面的方法,在接口的实现里面找,可以发现应该填void drawCircle (int radius,int x,int y)。
    第二空可以根据后面this drawCircle=drawCircle判断,这里应该有一个drawCircle属性,因此应该填)DrawCircle drawCircle。
    第三空这里用super,用super. drawcircle来引用父类的成员。
    第四空调用drawCircle(radius,x,y)方法。
    第五、六空分别创建一个红色圆形对象和一个绿色圆形对象作为Circle里面的实参。

  • 第4题:

    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();

    正确答案:C

  • 第5题:

    public class SyncTest (  private int x;  private int y;  private synchronized void setX (int i) (x=1;)  private synchronized void setY (int i) (y=1;)  public void setXY(int 1)(set X(i); setY(i);)  public synchronized Boolean check() (return x !=y;)  )  Under which conditions will check () return true when called from a different class?   

    • A、 Check() can never return true.
    • B、 Check() can return true when setXY is called by multiple threads.
    • C、 Check() can return true when multiple threads call setX and setY separately.
    • D、 Check() can only return true if SyncTest is changed to allow x and y to be setseparately.

    正确答案:B

  • 第6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(); }

    正确答案:C,E

  • 第7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) { }

    正确答案:A,C

  • 第8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;  }

    正确答案:B,D

  • 第9题:

    public class SyncTest {  private int x;  private int y;  public synchronized void setX (int i) (x=1;)  public synchronized void setY (int i) (y=1;)  public synchronized void setXY(int 1)(set X(i); setY(i);)  public synchronized Boolean check() (return x !=y;)  }  Under which conditions will check () return true when called from a different class?

    • A、 Check() can never return true.
    • B、 Check() can return true when setXY is called by multiple threads.
    • C、 Check() can return true when multiple threads call setX and setY separately.
    • D、 Check() can only return true if SyncTest is changed to allow x and y to be set separately.

    正确答案:A

  • 第10题:

    多选题
    现有:  public  class  TestDemo{     private int X-2;      static int y=3;  public  void method(){      final int i=100;      int j  =10;     class Cinner {  public void mymethod(){      //Here     }     }     }     } 在Here处可以访问的变量是哪些?()
    A

    X

    B

    y

    C

    j

    D

    i


    正确答案: B,A
    解析: 暂无解析

  • 第11题:

    多选题
    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; }


    正确答案: E,B
    解析: 暂无解析

  • 第12题:

    多选题
    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; }


    正确答案: A,B
    解析: 暂无解析

  • 第13题:

    若有以下程序:include using namespace std;class A{private:int a;public:void seta

    若有以下程序:#include <iostream>using namespace std;class A{private: int a;public: void seta(int x) { a=x; } void showa() { cout<<a<<","; }};class B{private: int b;public: void setb(int x) { b=x; } void showb() { cout<<b<<","; }};class C: public A, private B{private: int c;public: void setc(int x, int y, int z) { c=z; seta(x); setb(y); } void showc() { showa(); showb(); cout<<c<<end1; }};int main(){ C c; c.setc(1,2,3); c.showc(); return 0;}程序执行后的输出结果是( )。

    A.1,2,3

    B.1,1,1

    C.2,2,2

    D.3,3,3


    正确答案:A

  • 第14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 << "Drawing Circle[red,radius: " < 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;}


    答案:
    解析:
    (1)void drawCircle (int radius,int x,int y)(2)DrawCircle*drawCircle(3)drawcircle(4)drawCircle(radius,x,y)(5)new redCircle()(6)new greenCircle()
    【解析】

    第一空是填接口里面的方法,在接口的实现里面找,可以发现应该填void drawCircle (int radius,int x,int y)。第二空可以根据后面this drawCircle=drawCircle判断,这里应该有一个drawCircle属性,因此应该填)DrawCircle drawCircle。第三空这里填drawcircle,用-> drawcircle来引用父类的成员。第四空调用drawCircle(radius,x,y)方法。第五、六空分别创建一个红色圆形对象和一个绿色圆形对象作为Circle里面的实参。

  • 第15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;}


    答案:
    解析:
    (6)(1)void drawCircle (int radius,int x,int y)
    (2)DrawCircle*drawCircle
    (3)drawcircle
    (4)drawCircle(radius,x,y)
    (5)new RedCircle()
    (6)new GreenCircle()【解析】
    第一空是填接口里面的方法,在接口的实现里面找,可以发现应该填void drawCircle (int radius,int x,int y)。
    第二空可以根据后面this drawCircle=drawCircle判断,这里应该有一个drawCircle属性,因此应该填)DrawCircle drawCircle。
    第三空这里填drawcircle,用-> drawcircle来引用父类的成员。
    第四空调用drawCircle(radius,x,y)方法。
    第五、六空分别创建一个红色圆形对象和一个绿色圆形对象作为Circle里面的实参。

  • 第16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; }

    正确答案:A,B,F

  • 第17题:

    现有:  public  class  TestDemo{     private int X-2;      static int y=3;  public  void method(){      final int i=100;      int j  =10;     class Cinner {  public void mymethod(){      //Here     }     }     }     } 在Here处可以访问的变量是哪些?() 

    • A、X
    • B、y
    • C、j
    • D、i

    正确答案:A,B,D

  • 第18题:

    public class TestDemo{   private int x = 2;  static int y = 3;  public void method(){     final int i=100;     int j = 10;      class Cinner{  public void mymethod(){  //Here       }    } } }  在Here处可以访问的变量是哪些?() 

    • A、x
    • B、 y
    • C、 i
    • D、 j

    正确答案:A,B,C

  • 第19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) {}

    正确答案:A,C

  • 第20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();

    正确答案:D

  • 第21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 */ } }

    正确答案:B,E

  • 第22题:

    多选题
    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) { }


    正确答案: B,C
    解析: 暂无解析

  • 第23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?()
    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 */ } }


    正确答案: B,F
    解析: 暂无解析

  • 第24题:

    多选题
    public class TestDemo{   private int x = 2;  static int y = 3;  public void method(){     final int i=100;     int j = 10;      class Cinner{  public void mymethod(){  //Here       }    } } }  在Here处可以访问的变量是哪些?()
    A

    x

    B

    y

    C

    i

    D

    j


    正确答案: A,C
    解析: 暂无解析