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:
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2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3题:
class A { A() { } } class B extends A { } Which two statements are true?()
第4题:
Which two statements are true regarding the creation of a default constructor?()
第5题:
In which two cases does the compiler supply a default constructor for class A?()
第6题:
Which statements concerning the following code are true?() class a { public a() {} public a(int i) { this(); } } class b extends a { public boolean b(String msg) { return false; } } class c extends b { private c() { super(); } public c(String msg) { this(); } public c(int i) {} }
第7题:
Given the uncompleted code of a class: class Person { String name, department; int age; public Person(String n){ name = n; } public Person(String n, int a){ name = n; age = a; } public Person(String n, String d, int a) { // doing the same as two arguments version of constructor // including assignment name=n,age=a department = d; } } Which expression can be added at the "doing the same as..." part of the constructor?()
第8题:
You are creating a Windows Forms application by using the .NET Framework 3.5. You plan to develop a new control for the application.The control will have the same properties as a TextBox control.You need to ensure that the control has a transparent background when it is painted on form.You want to achieve this goal by using the minimum amount of development effort.What should you do?()
第9题:
The default constructor initializes method variables.
The default constructor has the same access as its class.
The default constructor invoked the no-arg constructor of the superclass.
If a class lacks a no-arg constructor, the compiler always creates a default constructor.
The compiler creates a default constructor only when there are no other constructors for the class.
第10题:
AnAdapter1 aa=new AnAdapter1(){}
AnAdapter0 aa=new AnAdapter0(){}
AnAdapter0 aa=new AnAdapter0(5){}
AnAdapter1 aa=new AnAdapter1(5){}
AnInterface a1=new AnInterface(5){}
第11题:
Class B’s constructor is public.
Class B’s constructor has no arguments.
Class B’s constructor includes a call to this().
Class B’s constructor includes a call to super().
第12题:
The default constructor initializes method variables.
The default constructor invokes the no-parameter constructor of the superclass.
The default constructor initializes the instance variables declared in the class.
If a class lacks a no-parameter constructor,, but has other constructors, the compiler creates a default constructor.
The compiler creates a default constructor only when there are no other constructors for the class.
第13题:
Copy constructor.
第14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15题:
Which three statements are true?()
第16题:
AnInterface is an interface. AnAdapter0 is a non-abstract, non-final class with a zero argument constructor. An Adapterl is a non-abstract, non-final class without a zero argument constructor, but with a constructor that takes one int argument. Which two construct an anonymous inner class()?
第17题:
Which two statements are true regarding the creation of a default constructor?()
第18题:
Which line contains a constructor in this class definition?() public class Counter { // (1) int current, step; public Counter(int startValue, int stepValue) { // (2) set(startValue); setStepValue(stepValue); } public int get() { return current; } // (3) public void set(int value) { current = value; } // (4) public void setStepValue(int stepValue) { step = stepValue; } // (5) }
第19题:
AnInterface is an interface. AnAdapter0 is a non-abstract, non-final class with a zero argument constructor. AnAdapter1 is a non-abstract, non-final class without a zero argument constructor, but with a constructor that takes one int argument. Which two construct an anonymous inner class?()
第20题:
AnAdapter1 aa = new AnAdapter1 () {}
AnAdapter0 aa = new AnAdapter0 () {}
AnAdapter0 aa = new AnAdapter0 (5) {}
AnAdapter1 aa = new AnAdapter1 (5) {}
AnInterface ai = new Anlnterface (5)) {}
第21题:
The code will fail to compile.
The constructor in a that takes an int as an argument will never be called as a result of constructing an object of class b or c.
Class c has three constructors.
Objects of class b cannot be constructed.
At most one of the constructors of each class is called as a result of constructing an object of class c.
第22题:
class A{}
class A { public A(){} }
class A { public A(int x){} }
class Z {} class A extends Z { void A(){} }
第23题:
The default constructor initializes method variables.
The compiler always creates a default constructor for every class.
The default constructor invokes the no-parameter constructor of the superclass.
The default constructor initializes the instance variables declared in the class.
When a class has only constructors with parameters, the compiler does not create a default constructor.
第24题:
( 难度:中等)下列关于constructor说法正确的有()。
A.constructor在一个对象被new时执行
B.constructor必须与class同名,但方法不能与class同名
C.class中的constructor不可省略
D.一个class只能定义一个constructor
答案:A