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)

以下类的声明中有错误,请指出错误的代码行号 class A { public: A(int a=0){ x=a; } static void f1(){ x++; }; private: int x; static int y; };

A.3

B.4

C.7

D.11


参考答案和解析
D
更多 “以下类的声明中有错误,请指出错误的代码行号 class A { public: A(int a=0){ x=a; } static void f1(){ x++; }; private: int x; static int y; };A.3B.4C.7D.11” 相关考题
考题 ( 35 )有如下程序:#include iostreamusing namespace std;Class B{public:B(int xx):x(xx) {++cout; x+=10;}virtual void show() const{coutcount ' _ ' xendl;}protected:static int count;private:int x;};class D:public B{public:D(int xx,int yy):B(xx),y(yy) {++count; y+=100;}virtual void show() const{coutcount ' _ ' yendl;}private:int y;};int B::count=0;int main(){B *ptr=new D(10,20);ptr-show();delete ptr;return 0;}运行时的输出结果是A ) 1_120B ) 2_120C ) 1_20D ) 2_20

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 给出下列代码,如何使成员变量m被方法fun( )直接访问?Class Test{private int m;public static void fun( ){} }A.将private int m改为protected int mB.将private int m改为public int mC.将private int m改为static int mD.将private int m改为int m

考题 给出下列代码,如何使成员变量m被方法fun( )直接访问? class Test{ private int m; public static void fun( ){ … } }A.将private int m改为protected int mB.将private int m改为public int mC.将private int m改为static iD.将private int m改为int m

考题 下面是类MyClass的定义,对定义中各种语句描述正确的是( )。class MyClass { publiC: void MyClass(int a) //①{ x=a; ) int func(int a,int b) //②{ x=a; y=b; } int func(int a,int b,int c=0) //③{ x=a; y=b; z=c; } static void resetValue() //④{ x=0; } private: int X,y,Z; };A.语句①是类MyClass的构造函数定义B.语句②和语句③实现类成员函数的重载C.语句④实现对类成员变量x的清零操作D.语句①、②、③和④都不正确

考题 有如下类的定义。应在空格处填入的语句是 ( )。 class MyClass { ______________ int x, y; public: MyClass(int a=0,int b=0) { x=a; y=b; } static void change{) { x-=10; y-=10; };A.staticB.constC.mutableD.不需要填入内容

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 下面程序段的输出结果为( )。 package test; public class ClassA { int x=20: static int y=6; public static void main(String args[]) { ClassB b=new ClassB; go(10); System.out.println("x="+b.x); } } class ClassB { 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 有以下程序:include using namespace std;class sample{private: int x; static int 有以下程序:#include <iostream>using namespace std;class sample{private: int x; static int y;public: sample(int a); static void print(sample s);};sample:: sample(int a){ x=a; y+=x;}void sample:: print(sample s){ cout<<"x="<<s. x<<",y="<<y<<end1;}int sample:: y=0;int main(){ sample s1(10); sample s2(20); sample:: print(s2); return 0;}程序运行后的输出结果是( )。A.x=10,y=20B.x=20,y=30C.x=30,y=20D.x=30,y=30

考题 有如下类的定义,下划线处的语句是( )。class MyClass{_______________ int x, y;Public:MyClass (int a=0,int b=0){x=a;y=b;}static void change(){y-=10;y-=10;}};A.staticB.constC.mutableD.不需要填入内容

考题 有以下程序:includeusing namespace std;class sample{private:int x;static int y; 有以下程序: #include<iostrearn> using namespace std; class sample { private: int x; static int y; public: sample (int A) ; static void print (sample s); }; sample::sample(int A) { x=a; y+=x; }A.x=10,y=20B.x=20,y=30C.x=30,y=20D.x=30,y=30

考题 若有以下程序:includeusing 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() { Cc; c.setc(1,2,3); c.showc(); retrun 0; } 程序执行后的输出结果是A.1,2,3B.1,1,1C.2,2,2D.3,3,3

考题 有如下类的定义。空格处的语句是class MyClass{ ______ int x, y;public: MyClass(int a=0, int b=0) { x=a; y=b; } static void change() { x-=10; y-=10; }};A.staticB.constC.privateD.不需要填入内容

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 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.1,2,3B.1,1,1C.2,2,2D.3,3,3

考题 下面的例子中using System;class A{public static int X;static A(){X=B.Y+1;}}class B{public static int Y=A.X+1;static B(){}static void Main(){Console.WriteLine("X={0},Y={1}",A.X,B.Y);}}产生的输出结果是什么?

考题 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.1,2,3B.1,1,1C.2,2,2D.3,3,3

考题 请找出下列程序中错误之处 ______。 include classA{private: intx1;protected: int 请找出下列程序中错误之处 ______。#include<iostream.h>class A{private:int x1;protected:int x2;public:int x3;};class B:public A{private:int y1;protected:int y2;public:int y3;void disp(){cout<<x1<<y1<<end1:} //Avoid set(int i) {x2=i;} //B};void main() {B bb;bb.x3=10; //Cbb.y3=10; //D}A.AB.BC.CD.D

考题 有如下类的定义,横线处的语句是( )。 class TestClass { ______ int x,y; public: TestClass(int a=0,int b=0) { X=a: y=b; } static void change() { y-=10; y-=10; } };A.publicB. privateC.staticD.protected

考题 includeiostream.hclass A{private:int x,y;public:void f1(int i=0,int j=0){x=i;y=j;}void print(){coutx yendl;}void f1(int i=0){x=i,y=0;}};void main(){A a;a.f1(5);a.print();}

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 class Foo {  public static void main(String [] args) {  int x = 0;  int y = 4;  for(int z=0; z 〈 3; z++, x++) {  if(x 〉 1  ++y 〈 10) y++;  }  System.out.println(y);  }  }  结果是什么?()  A、6B、7C、8D、10

考题 现有:  class Foo  {  public static void main (String  []  args)  {      int x=O;      int y=4;  for (int  z=0;  z3;  Z++;  X++)  {     if(x1++y10)    y++;    }  System. out .println (y);  }   }  结果是什么?()     A、7B、8C、10D、12

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 Which two code fragments are most likely to cause a StackOverflowError?()A、int []x = {1,2,3,4,5};for(int y = 0; y  6; y++)    System.out.println(x[y]);B、static int[] x = {7,6,5,4};static { x[1] = 8;x[4] = 3; }C、for(int y = 10; y  10; y++)doStuff(y);D、void doOne(int x) { doTwo(x); }void doTwo(int y) { doThree(y); }void doThree(int z) { doTwo(z); }E、for(int x = 0; x  1000000000; x++) doStuff(x);F、void counter(int i) { counter(++i); }

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 */ } }

考题 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?()AXByCjDi

考题 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?()AxByCiDj