AnAdapter1 aa=new AnAdapter1(){}
AnAdapter0 aa=new AnAdapter0(){}
AnAdapter0 aa=new AnAdapter0(5){}
AnAdapter1 aa=new AnAdapter1(5){}
AnInterface a1=new AnInterface(5){}
第1题:
A.class中的constructor不可省略
B.constructor在一个对象被new时执行
C.一个class只能定义一个constructor
D.constructor必须与class同名,但方法不能与class同名
第2题:
以下程序的输出结果是_____。
include<iostream.h>
class object
{ private:
int val;
public:
object( ) ;
object(int i) ;
~object( ) ;};
object: :object( )
{ val=0;
cout < < "Default constructor for object" < < endl;}
object: :object(int i)
{ val=i;
cout < < "Constructor for object" < < val < < endl;}
object: :~object( )
{ cout < < "Destructor for object" < < val < < endl;}
class container{ private:
object one;
object two;
int data;
public:
container( ) ;
container(int i,int j,int k) ;
~container( ) ;};
container: :container( )
{ data=0;
cout < < "Default constructor for container" < < endl;}
container: :container(int i,int j,int k) :two(i) ,one(j)
{ data=k;
cout < < "Constructor for container" < < endl;}
container: :~container( )
{ cout < < "Destructor for container" < < endl;}
void main( )
{ container anObj(5,6,10) ;}
第3题:
下列说法正确的有()
A.class中的constructor不可省略
B.constructor必须与class同名,但方法不能与class同名
C.constructor在一个对象被new时执行
D.一个class只能定义一个constructor
第4题:
class A { A() { } } class B extends A { } Which two statements are true?()
第5题:
C# provides, by default a parameterless constructor. If I write a constructor that takes a string as a parameter, but want to keep the parameterless constructor. How many constructors should I write?
(C#提供默认构造函数(不带参数),如果我写了一个带有一个string类型参数的构造函数,但是又想保留不带参数的构造函数,那么我需要写多少个构造函数)
第6题:
下列程序时类D代码段出现编译错误,原因是【 】。
include<iostream. h>
class A
{
public:
A(char c){cout<<"A's constructor."<<c<<endl;}
~A(){cout<<"A's destructor."<<endl;}
};
class B: virtual public A
{
public:
B(char cb,char cd):A(cb) {cout<<"B's constructor."<<cd<<endl;}
~B(){cout<<"B's destructor."<<endl;}
private:
char b;
};
class C:virtual public A
{
public:
C(char cc, char cd):A(cc)
{cout<<"C's constructor. "<<cd<<endl;}
~C(){cout<<"C's destructor."<<endl;}
};
class D:public B,public C
{
public:
D(char cd,char ce,char cf, char cg, char ch,char ci)
:C(cf,cg),B(cd,ce),A(cd),aa(ch)
{cout<<"D's constructor."<<ci<<endl;}
~D() {cout<<"D's destructor."<<endl;}
private:
A aa;
};
void main()
{
D ohj('a','b','c','d','e','f')
}
第7题:
Copy constructor.
第8题:
有如下程序:#include<iostream>using namespace std;class test{private: int a;public: test(){cout<<"constructor"<<endl;} test(int a){cout<<a<<endl;} test(const test&_test) { a=_test.a; cout<<"copy constructor"<<en+dl; } ~test(){cout<<"destructor"<<endl;}};int main(){ test A(3); rerun 0;}运行时输出的结果是
A.3
B.constructor destructor
C.copy constructor destructor
D.3 destructor
第9题:
有如下程序: #inClude<iostream> using namespaCe std; Class test{ private: int a; publiC: test( ){Cout<<”ConstruCtor”<<endl;} test(int A.{Cout<<a<<endl;} test(Const test&_test){ a=test.a: Cout<<”Copy ConstruCtor”<<endl: } test( ){Cout<<”destruCtor”<<endl;} }; int main( ){ test A(3); return 0; } 执行这个程序的输出结果是( )。
A.3
B.ConstruCtor destruCtor
C.Copy ConstruCtor destruCtor
D.3 destruCtor
第10题:
Which three statements are true?()