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单选题
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();
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更多 “单选题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();” 相关考题
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
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
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.12,12B.5,5C.12,5D.5,12
考题
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
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
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
1. public class X implements Runnable( 2. private int x; 3. private int y; 4. 5. public static void main(String[]args) 6. X that = new X(); 7. (new Thread(that)).start(); 8. (new Thread(that)).start(); 9. ) 10. 11. public void run() ( 12. for (;;) ( 13. x++; 14. y++; 15. System.out.printIn(“x=” + x + “, y = ” + y); 16. ) 17. ) What is the result?()A、 Errors at lines 7 and 8 cause compilation to fail.B、 The program prints pairs of values for x and y that might not always be the same on the same line (for example, “x=2, y=1”).C、 The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=1, y=1”).D、 The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears only for once (for example, “x=1, y=1” followed by “x=2, y=2”).
考题
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();
考题
class Foo { private int x; publicFoo(intx) {this.x=x; } public void setX( int x) { this.x = x; } public int getX() { return x; } } public class Gamma { static Foo fooBar( Foo foo) { foo = new Foo( 100); return foo; } public static void main( String[] args) { Foo foo = new Foo( 300); System.out.print( foo.getX() + “-“); Foo fooFoo = fooBar( foo); System.out.print( foo.getX() + “-“); System.out.print( fooFoo.getX() + “-“); foo = fooBar( fooFoo); System.out.print( foo.getX() + “-“); System.out.prmt( fooFoo.getX()); } } What is the output of this program?()A、 300-100-100-100-100B、 300-300-100-100-100C、 300-300-300-100-100D、 300-300-300-300-100
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
1. public class Test { 2. public T findLarger(T x, T y) { 3. if(x.compareTo(y) 0) { 4. return x; 5. } else { 6. return y; 7. } 8. } 9. } and: 22. Test t = new Test(); 23. // insert code here Which two will compile without errors when inserted at line 23?() A、 Object x = t.findLarger(123, “456”);B、 int x = t.findLarger(123, new Double(456));C、 int x = t.findLarger(123, new Integer(456));D、 int x = (int) t.findLarger(new Double(123), new Double(456));
考题
1. class SuperFoo { 2. SuperFoo doStuff(int x) { 3. return new SuperFoo(); 4. } 5. } 6. 7. class Foo extends SuperFoo { 8. //insert code here 9. } 下面哪三项分别插入到第8行,可以编译?()A、int doStuff() { return 42; }B、int doStuff(int x) { return 42; }C、Foo doStuff(int x) { return new Foo(); }D、SuperFoo doStuff(int x) { return new Foo(); }
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
10. public class Foo implements java.io.Serializable { 11. private int x; 12. public int getX() { return x; } 12.publicFoo(int x){this.x=x; } 13. private void writeObject( ObjectOutputStream s) 14. throws IOException { 15. // insert code here 16. } 17. } Which code fragment, inserted at line 15, will allow Foo objects to be correctly serialized and deserialized?() A、 s.writeInt(x);B、 s.serialize(x);C、 s.writeObject(x);D、 s.defaultWriteObject();
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
1. public class Blip { 2. protected int blipvert(int x) { return 0; } 3. } 4. class Vert extends Blip { 5. // insert code here 6. } Which five methods, inserted independently at line 5, will compile?() A、 public int blipvert(int x) { return 0; }B、 private int blipvert(int x) { return 0; }C、 private int blipvert(long x) { return 0; }D、 protected long blipvert(int x, int y) { return 0; }E、 protected int blipvert(long x) { return 0; }F、 protected long blipvert(long x) { return 0; }G、protected long blipvert(int x) { return 0; }
考题
单选题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
单选题10. public class Foo implements java.io.Serializable { 11. private int x; 12. public int getX() { return x; } 12.publicFoo(int x){this.x=x; } 13. private void writeObject( ObjectOutputStream s) 14. throws IOException { 15. // insert code here 16. } 17. } Which code fragment, inserted at line 15, will allow Foo objects to be correctly serialized and deserialized?()A
s.writeInt(x);B
s.serialize(x);C
s.writeObject(x);D
s.defaultWriteObject();
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1. public class X implements Runnable( 2. private int x; 3. private int y; 4. 5. public static void main(String[]args) 6. X that = new X(); 7. (new Thread(that)).start(); 8. (new Thread(that)).start(); 9. ) 10. 11. public void run() ( 12. for (;;) ( 13. x++; 14. y++; 15. System.out.printIn(“x=” + x + “, y = ” + y); 16. ) 17. ) What is the result?()A
Errors at lines 7 and 8 cause compilation to fail.B
The program prints pairs of values for x and y that might not always be the same on the same line (for example, “x=2, y=1”).C
The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=1, y=1”).D
The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears only for once (for example, “x=1, y=1” followed by “x=2, y=2”).
考题
单选题class Foo { private int x; publicFoo(intx) {this.x=x; } public void setX( int x) { this.x = x; } public int getX() { return x; } } public class Gamma { static Foo fooBar( Foo foo) { foo = new Foo( 100); return foo; } public static void main( String[] args) { Foo foo = new Foo( 300); System.out.print( foo.getX() + “-“); Foo fooFoo = fooBar( foo); System.out.print( foo.getX() + “-“); System.out.print( fooFoo.getX() + “-“); foo = fooBar( fooFoo); System.out.print( foo.getX() + “-“); System.out.prmt( fooFoo.getX()); } } What is the output of this program?()A
300-100-100-100-100B
300-300-100-100-100C
300-300-300-100-100D
300-300-300-300-100
考题
单选题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();
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 */ } }
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