300-100-100-100-100
300-300-100-100-100
300-300-300-100-100
300-300-300-300-100
第1题:
classFoo{
privateintx;
publicFoo(intx){this.x=x;}
publicvoidsetX(intx){this.x=x;}
publicintgetX(){returnx;}
}
publicclassGamma{
staticFoofooBar(Foofoo){
foo=newFoo(100);
returnfoo;
}
publicstaticvoidmain(String[]args){
Foofoo=newFoo(300);
System.out.print(foo.getX()+-);
FoofooFoo=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());
}
}
Whatistheoutputofthisprogram?()
第2题:
有如下程序: #include<iostream> using namespace std; class Part{ public: Part(int x=0):val(x) {cout<<val;} ~Part(){cout<<val;} private: int val; }; class Whole{ public: Whole(int x ,int y, int z=0):p2(x),p1(y),val(z){cout<<val;} ~Whole(){cout<<val;} private: Part p1,p2; int val; }; int main() Whole obj(1,2,3); return 0; } 程序的输出结果是( )。
A.123321
B.213312
C.213
D.123123
第3题:
有以下程序: #include <iostream> using namespace std; #define PI 3.14 class Point { private: int x,y; public: Point(int a,int b) { x=a; y=b; } int getx() { return x; } int gety() { return y; } }; class Circle : public Point { private: int r; public: Circle(int a,int b,int c):Point(a,b) { r=c; } int getr() { return r; } double area() { return PI*r*r; } }; int main() { Circle c1(5,7,10); cout<<cl.area()<<endl; return 0; } 程序执行后的输出结果是
A.314
B.157
C.78.5
D.153.86
第4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5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6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7题:
有以下程序: #inClUde <iostream> using namespace std; Class Base { public: Base(int x) { a=x; } void show() { cout<<a; } private: int a; }; class Derived : public Base { public: Derived(int i) :Base(i+1),b(i){} void Show() { cout<<b; } private: int b; }; int main() { Base b(5),*pb; Derived d(1); pb=&d; pb->show(); return 0; } 运行后的输出结果是( )。
A.1
B.5
C.2
D.0
第8题:
若有语句:int x,*p=&x;则与该语句等价的语句是()
第9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?()
第10题:
2
3
4
5
第11题:
s.writeInt(x);
s.serialize(x);
s.writeObject(x);
s.defaultWriteObject();
第12题:
s.defaultReadObject();
this = s.defaultReadObject();
y = s.readInt(); x = s.readInt();
x = s.readInt(); y = s.readInt();
第13题:
10.publicclassFooimplementsjava.io.Serializable{11.privateintx;12.publicintgetX(){returnx;}12.publicFoo(intx){this.x=x;}13.privatevoidwriteObject(ObjectOutputStreams)14.throwsIOException{15.//insertcodehere16.}17.}Whichcodefragment,insertedatline15,willallowFooobjectstobecorrectlyserializedanddeserialized?()
A.s.writeInt(x);
B.s.serialize(x);
C.s.writeObject(x);
D.s.defaultWriteObject();
第14题:
有如下类的定义。横线处的语句是( )。 class MyClass { public: MyClass(int a=0,int b=0) { X=a; Y=b; } void Change()const { X-=10; Y+=10; } private: ______intX, Y;
A.static
B.const
C.mutable
D.不需要填入内容
第15题:
有以下程序:
include<iostream.h>
class A
{
int x;
public:
A(int a)
{
x=a;
}
friend class B;
}
class B{
public:
void print(A a){
a. x--;
cout<<a.x<<end1;
}
};
void main()
{
A a(10);
B b;
b.print(a) ;
}
程序执行后的输出结果是【 】。
第16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17题:
下面程序中错误之处是 ______。
include<iostream.h>
class A{
private:
int xl;
protected:
int x2;
public:
int x3;
};
class B: public A{
private:
int b1;
protected:
int b2;
public:
int b3;
void disp(){cout<<x1<<b2<<end1;} //A
void set(int i){x3=i;} //B
};
void main()
B bb;
bb. a3=10 //C
bb. b3=10 //D
}
第18题:
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: }} }}
第19题:
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; } }
第20题:
下列类的定义中正确的是()
第21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?()
第22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23题:
Move the line 12 print statement into the foo() method.
Change line 7 to public synchronized void go() {.
Change the variable declaration on line 3 to private volatile int x;.
Wrap the code inside the foo() method with a synchronized( this ) block.
Wrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }.
第24题:
1
2
3
4