Line16
Line17
Line18
Line19
The object is NOT a candidate for garbage collection.
第1题:
下面程序的运算结果是( )。 #include<iostream> using namespace std; class A { public: virtual void fun()=0; }; class B:public A } public: void fun() {cout<<"new file"<<" ";} }; class C:public A { public: void fun() { cout<<"open file"<<" ";} }; void main() { A a, * p; B b;C c; p=&c; p->fun(); p=&b; }
A.new file open file
B.new file new file
C.编译出错
D.open file new file
第2题:
请写出下面的输出:
class B
{
public:
virtual void Print(void)
{
printf(“B::Print\n”);
}
virtual void Reprint(void)
{
printf(“B:Reprint\n”);
}
void Algo(void)
{
Print();
Reprint();
}
};
class D : public B
{
public:
virtual void Print(void)
{
printf(“D::Print\n”);
}
};
void main()
{
B *p = new D();
p->Print();
p->Algo();
}
第3题:
为使下列代码正常运行,应该在下划线处填入的选项是
int〔〕numbers=new int[n];
for(Int i=0;i <numbers.____;i++)
numbers[i]=i+1;
A.size
B.length
C.dimension
D.measurement
第4题:
11.public void genNumbers(){ 12.ArrayList numbers=new ArrayList(); 13.for(inti=0;i<10;i++){ 14.intvalue=i*((int)Math.random()); 15.IntegerintObj=newInteger(value); 16.numbers.add(intObj); 17.} 18.System.out.println(numbers); 19.} Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()
第5题:
下面程序的结果是 ______。 #include<iostream.h> class A{ public: virtual void fun()=0{}; }; class B:public A{ public: void fun () {cout<< "new file" ;} }; class C: public A{ public: void fun (){cout<<"open file"<< " " } }; class D: public A{ public: void fun () {cout<< "save file\n" ;} }; void main() { A a,*p; B b; C c; D d; p=&c; p->fun (); p=&b; p->fun (); p=&d; p->fun(); }
A.new file open file save file
B.new file new file new file
C.编译出错
D.open file new file save file
第6题:
写出程序的输出结果:
public class A
{
public virtual void Fun1(int i)
{
Console.WriteLine(i);
}
public void Fun2(A a)
{
a.Fun1(1);
Fun1(5);
}
}
public class B : A
{
public override void Fun1(int i)
{
base.Fun1 (i + 1);
}
public static void Main()
{
B b = new B();
A a = new A();
a.Fun2(b);
b.Fun2(a);
}
}
第7题:
阅读下面程序 public class Test implements Runnable { public static void main(String[] args) { ______ t.start(); } public void run() { System.out.println("Hello!"); } } 程序中下画线处应填入的正确选项是
A.Test t=new Test();
B.Thread t=new Thread();
C.Thread t=new Thread(new Test());
D.Test t=new Thread();
第8题:
11.public void genNumbers(){12.ArrayList numbers=new ArrayList();13.for(inti=0;i14.intvalue=i*((int)Math.random());15.IntegerintObj=newInteger(value);16.numbers.add(intObj);17.}18.System.out.println(numbers);19.}Which line of code marks the earliest point that an object referenced by intObj becomes a candidate for garbagec ollection?()
A.Line16
B.Line17
C.Line18
D.Line19
E.The object is NOT a candidate for garbage collection.
第9题:
class One { public One() { System.out.print(1); } } class Two extends One { public Two() { System.out.print(2); } } class Three extends Two { public Three() { System.out.print(3); } } public class Numbers{ public static void main( String[] argv) { new Three(); } } What is the result when this code is executed?()
第10题:
class MyThread extends Thread { public void run() { System.out.println(“AAA”); } public void run(Runnable r) { System.out.println(“BBB”); } public static void main(String[] args) { new Thread(new MyThread()).start(); } } What is the result?()