多选题给出下列java源代码: //Point x Public class Interesting{} 在源代码//point x处添加()能符合java语法Aimport java.awt.*Bpackage local.utilCclass MoreInteresting{}Dprotected class MoreInteresting{}
多选题
给出下列java源代码: //Point x Public class Interesting{} 在源代码//point x处添加()能符合java语法
A
import java.awt.*
B
package local.util
C
class MoreInteresting{}
D
protected class MoreInteresting{}
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给出下列java源代码://PointxPublicclassInteresting{}在源代码//pointx处添加()能符合java语法 A.importjava.awt.*B.packagelocal.utilC.classMoreInteresting{}D.protectedclassMoreInteresting{}
在如下源代码文件Test.java中, 哪个是正确的类定义?() A.public class test { public int x = 0; public test(int x) { this.x = x; } }B.public class Test{ public int x=0; public Test(int x) { this.x = x; } }C.public class Test extends T1, T2 { public int x = 0; public Test (int x) { this.x = x; } }D.public class
下面程序的输出结果是【】。 inclde include using namespace std; class point { 下面程序的输出结果是【 】。inclde<iostreamn>include<math>using namespace std;class point{private:double x;double y;public:point(double a,double b){x=a;y=b;}friend double distance(point a,point b);};double distance(point a,point b){return sqrt((a.x-b.x)*(a.x-b.x)+(a.y-b.y)*(a.y-b.y));}int main(){point p1(1,2);point p2(5,2);cout<<distalice(p1,p2)<<endl;return 0;}
下列哪个选项的java源文件代码片段是不正确的?A.package testpackage; public class Test{ }B.import java. io. *; package testpaekage; public class Test { }C.import java.io.*; class Person { } public class Test { }D.import java.io.*; import java. awt.*; public class Test{ }
在下列源代码文件Test.java中,正确定义类的代码是( )。A.pblic class test { public int x=0; public test(int x) { this. x=x;} }B.public class Test { public int x=0; public Test(int x) { this. x=x;} }C.public class Test extends T1,T2{ public int x = 0; public Test(int x){ this. x = x; } }D.protected class Test extends T2{ public int x = 0; public Test(int x) { this. x = x; } }
有如下程序:include using namespace std;class point{int x, y;public:point( int v 有如下程序:#include <iostream>using namespace std;class point{ int x, y;public: point( int vx, int vy ) { X=vx; y=vy; } point() { x=0; y=0; } point operator+ ( point p1 ) { point p; int px = x + p1.x; int py = y+ p1.y; return point( px, py ); } point operator-( point p1 { point p; int px = x - p1.x; int py = y - p1.y; return point( px, py ); } void print() { cout<<x<<","<<y<<end1; }};int main(){ point p1( 10, 10 ), p2( 20, 20 ); p1 = p1 + p2; p1.print(); return ();}执行后的输出结果是( )。A.10, 10B.20, 20C.10, 20D.30, 30
有以下程序:includeusing namespace std;definePl 3.14Class Point{private:int x,y 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 {priA.314B.157C.78.5D.153.86
有如下程序:include using namespace std;class point{intx,y;public:point( int vx, 有如下程序:#include <iostream>using namespace std;class point{ int x, y;public: point( int vx, int vy ) { x = vx; y = vy; } point ( ) x = 0; y= 0; } point operator+( point p1 ) { point p; int px = x+ p1.x; int py = y + p1.y; return point( px, py ); point operator-( point p1 ) { point p; int px = x -p1.x; int py = y - p1.y; return point ( px, py ); } void print() { cout<<x<<" , "<<y<<end1; }};int main (){ point p1(10, 10 ), p2( 20, 20 ); p1 = p1 - p2; p1.print (); return 0;} 执行后的输出结果是A.10,10B.20,20C.10,20D.30,30
下列哪个选项的java源文件程序段是不正确的? ( )A.package testpackage; public class Test{ }B.import java.io.*; package testpackage; public class Test{ }C.import java.i.*; class Person{} public class Test{ }D.import java.io.*; import java.awt.*; public class Test { }
有如下程序: include using namespace std; class point {int x,y; public:point( i 有如下程序: #include <iostream> using namespace std; class point { int x, y; public: point( int vx, int vy ) { x = vx; y = vy; } point ( ) { x = 0; y = 0; } point operator+( point pl ) { point p; int px = x + p1.x; int py = y + p1.y; return point( px, py ); } point operator-( point p1 ) { point p; int px = x - p1.x; int py = y - p1.y; return point( px, py ); } void print() { cout<<x<<", "<<y<<end1; } }; int main () { point pl ( 10, 10 ), p2 ( 20, 20 ); p1 = p1 + p2; p1.print (); return 0; } 执行后的输出结果是( )。A.10,10B.20,20C.10,20D.30,30
在下列源代码文件Test.java中, ( )是正确的类定义。A.public class test{B.public class Test{ public int x=0;public int x=0; public test (intx) public Test (int x){ {this.x=x; this.x=x;} }} }C.public class Test extends T1,T2{D.protected class Test extends T2{ public int=0;public int x=0; public Test(int x){Public Test (int x){ this.x=x;this.x=x: }} }}
本题的功能是通过鼠标确定两个点,然后画两点间的直线。窗口中有一个按钮“Draw line”,单击该按钮后,它就处于按下状态,然后用鼠标在窗口中单击一下,在单击的地方就会出现一个坐标圆点,用鼠标在另外一个地方单击一下又会出现另外一个圆点,并且此时在两个坐标圆点间画出一条直线,且“Draw line”处于可用状态,再单击这个按钮就可以画另外一条直线。Import java.awt.*import java.awt.event.*;import javax.swing.*;class EventQueuePanel extends JPanel implements Ac-tionListener{EventQueuePanel(){JButton button=new JButton("Draw line");add(button);button.addActionListener(this);}public void actionPerformed(ActionEvent evt)(Graphics g=getGraphics();P=getClick();g.drawOval(P.x-2,P.Y-2,4,4);Point q=getClick();g.drawOval(q.x-2,q.y-2,4,4);g.drawLine(P.X,P.Y,q.x,q.y);g.dispose();}public Point getClick(){EventQueue eq=Toolkit.getDefaultToolkit().getSystemEventQueue();while(true){try{AWTEvent evt=eq.getNextEvent();if(evt.getID()= =MouseEvent.MOUSE.PRESSED){MouseEvent mevt=(MouseEvent)evt;Point P= ();Point top=getRootPane().getLocation();P.X-=top.x;P.Y-=top.Y;return P;}}catch(InterruptedException e){}}}private int Y=60;}class EventQueueFrame. extends JFrame{public EventQueueFrame(){setTitle("java2");setSize(300,200);addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});Container contentPane=getContentPane();contentPane.add(new EventQueuePanel());}}public class java2{public static void main(String[]args){Frame. frame=new EventQueueFrame();frame.show();}}
在下列源代码文件Test.java中,哪个选项是正确的类定义? ( )A.public class test { public int x=0; public test(int x) { this.x=x; } }B.public class Test { public int x=0; public Test(int x) { this.x=x; } }C.public class Test extends Ti,T2 { public int x=0; public Test(int x) { this.x=x; } }D.protected class Test extends T2 { public int x=0; public Test(int x) { this.x=x; } }
有以下程序:includeincludeusingnamespacestd;classDistance;classpoint{pub 有以下程序: #include <iostream> #include <cmath> using namespace std; class Distance; class point { public: friend class Distance; Point(int a,int B) { x=a; Y=b; } void Print() { cout<<"X= "<<X<<end1; cout<<"Y= "<<Y<<end1; } private: float X,Y; }; class Distance { public: float Dis(Point p,Point q); }; float Distance :: Dis(Point p,Point q) { float result; result=sqrt((p.X-q.X)*(p.X-q.X)+(p.Y-q.Y)*(p.Y-q.Y)); cout<<result<<end1; retUrn result; } int main() { Point p(10,10),q(10,30); Distance d; d.Dis(p,q); return 0; } 运行后的输出结果是( )。A.10B.30C.0D.20
试完成下述程序片段:public class Point(){ int x,y;public Point(int x,int y){ =x; =y;}......} A. Point.x Point.yB.无解C. x1 y1D.this.x this.y
给出下列java源代码: //Point x Public class Interesting{} 在源代码//point x处添加()能符合java语法 A、import java.awt.*B、package local.utilC、class MoreInteresting{}D、protected class MoreInteresting{}
10. class Line { 11. public static class Point { } 12. } 13. 14. class Triangle { 15. // insert code here 16. } Which code, inserted at line 15, creates an instance of the Point class defined in Line?() A、 Point p = new Point();B、 Line.Point p = new Line.Point();C、 The Point class cannot be instatiated at line 15.D、 Line 1 = new Line() ; 1.Point p = new 1.Point();
10. class Line { 11. public class Point { public int x,y; } 12. public Point getPoint() { return new Point(); } 13. } 14. class Triangle { 15. public Triangle() { 16. // insert code here 17. } 18. } Which code, inserted at line 16, correctly retrieves a local instance of a Point object?() A、 Point p = Line.getPoint();B、 Line.Point p = Line.getPoint();C、 Point p = (new Line()).getPoint();D、 Line.Point p = (new Line()).getPoint();
多选题Which are syntactically valid statement at// point x?() class Person { private int a; public int change(int m){ return m; } } public class Teacher extends Person { public int b; public static void main(String arg[]){ Person p = new Person(); Teacher t = new Teacher(); int i; // point x } }Ai = m;Bi = b;Ci = p.a;Di = p.change(30);Ei = t.b.
单选题10. class Line { 11. public class Point { public int x,y; } 12. public Point getPoint() { return new Point(); } 13. } 14. class Triangle { 15. public Triangle() { 16. // insert code here 17. } 18. } Which code, inserted at line 16, correctly retrieves a local instance of a Point object?()A Point p = Line.getPoint();B Line.Point p = Line.getPoint();C Point p = (new Line()).getPoint();D Line.Point p = (new Line()).getPoint();
判断题Java的源代码中定义几个类,编译结果就生成几个以“.class”后缀的字节码文件。A对B错