x
y
i
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第1题:
执行下面程序段,屏幕上将输出( )。 public class Test { private int x=10,y=20; public Test (int x,int y) { System.out.println (x+this.x); System.out.println (y+y); } public static void main (String[] args) { Testt= new Test(30,50); } }
A.无输出
B.20 40
C.40 100
D.40 70
第2题:
有如下类定义:
class Point{
public:
Point(int xx=0,int yy=0):x(xx),y(yy) { }
private:
int x,y;
};
class Circle:public Point{
public:
Circle(int r):radius(r) { }
private:
int radius;
};
派生类Circle中数据成员的个数是( )。
A、3
B、1
C、5
D、2
答案:A
解析:本题考查默认构造函数和带参数的构造函数,题目中定义一个对象a(2)以及对象数组b[3],共执行3次构造函数,对象指针不调用构造函数。
第3题:
有以下程序: #include<iostream> using namespace std; #definePl 3.14 Class Point {private: int x,y; public: Point(int a,intB) {X=a; y:b;} int getx() <return x;} int gety() {return y;}}; class Circle:public Point {pri
A.314
B.157
C.78.5
D.153.86
第4题:
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=20
B.x=20,y=30
C.x=30,y=20
D.x=30,y=30
第5题:
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=20
B.x=20,y=30
C.x=30,y=20
D.x=30,y=30
第6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=10
B.x=20
C.x=6
D.编译不通过
第7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?
第8题:
有下列程序: #include<iostream> using namespace std; class TestClass { private: int x,y; public: TestClass (int i,int j) { x=i; y=j; } void print() { cout<<"printl"<<endl; } vo
A.print1
B.print2
C.pfint1 print2
D.程序编译时出错
第9题:
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
第10题:
Given: 1. public class ConstOver { 2. public constOver(int x, int y, int z) { 3. } 4. } Which two overload the ConstOver Constructor?()
第11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?()
第12题:
X
y
j
i
第13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(current<0) 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;i<nsquares;i++) draw(g,i); } public int find(int X,int y) (for(int i=0;i<nsquares;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(nsquares<MAXNSQUARES) {squares[nsquares]=new Point(x,y); current=nsquares ; nsquares++; repaint; } } public void remove(int n) {if(n<0 ‖ 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; } }
第14题:
有以下程序: #include <iostream> using namespace std; class A { private: int x,y; public: void set (int i,int j) { x=i; y=j; } int get_y() { return y; } }; class box { private: int length,width; A label; public: void set(int 1,int w, int s,int p) { length=1; width=w; label.set(s,p); } int get_area() { return length*width; } }; int main() { box small; small.set(2,4,1,35); cout<<small.get_area()<<end1; return 0; } 运行后的输出结果是( )。
A.8
B.4
C.35
D.70
第15题:
有如下程序: #jnClude<iostream> using namespaCe std; Class Part{ publiC: Part(int x=0):val(X){Cout<<val;} ~Part{Cout<<val;} private: int val; t }; Class Whole{ publiC: Whole(int x,int Y,int z=0):p2(x),pl(y),val(z){Cout<<val;} ~Whole{eout<<val;} private: Part pl,p2; int val; }; int main { Whole obj(1,2,3); return 0; } 执行这个程序的输出结果是( )。
A.123321
B.213312
C.213
D.123123
第16题:
若有以下程序: #include <iostream> using namespace std; class Base { private: int a,b; public: Base(int x, int y) { a=x; b=y; } void show() { cout<<a<<", "<<b<<end1; } }; class Derive : public Base { private: int c, d; public: Derive(int x, int y, int z,int m):Base(x,y) { c=z; d=m; } void show() { cout<<c<<", "<<d<<end1; } }; int main ( ) { Base b(50,50) ,*pb; Derive d(10,20,30,40); pb=&d; pb->show {); return 0; }
A.10,20
B.30,40
C.20,30
D.50,50
第17题:
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.1,2,3
B.1,1,1
C.2,2,2
D.3,3,3
第18题:
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
第19题:
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
第20题:
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:} //A
void set(int i) {x2=i;} //B
};
void main() {
B bb;
bb.x3=10; //C
bb.y3=10; //D
}
A.A
B.B
C.C
D.D
第21题:
public class ConstOver { public ConstOver (int x, int y, int z) { } } Which two overload the ConstOver constructor?()
第22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?()
第23题:
public class Circle implements Shape { private int radius; }
public abstract class Circle extends Shape { private int radius; }
public class Circle extends Shape { private int radius; public void draw(); }
public abstract class Circle implements Shape { private int radius; public void draw(); }
public class Circle extends Shape { private int radius;public void draw() {/* code here */} }
public abstract class Circle implements Shape { private int radius;public void draw() { / code here */ } }
第24题:
x
y
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j