There are a class A. Another class B derived from it.
Now if I do A a = new B(); and B b = new B(); What will
happen in both the statements. And what is the difference
between these two statements.

Answers were Sorted based on User's Feedback



There are a class A. Another class B derived from it. Now if I do A a = new B(); and B b = new B();..

Answer / srushtitha.

here,A is Base class, B is Derived class.
in the first statement "the object of B is stored in parent
clss reference"(Runtime Polymorphism).

-->In the secend statement "the object is creacted for the
child class.

Is This Answer Correct ?    23 Yes 3 No

There are a class A. Another class B derived from it. Now if I do A a = new B(); and B b = new B();..

Answer / ashok kumar

A is a base class, B is a derived class.
Which means we cad access all the data of A class in B class.

Public A
{...}
Public B:A
{...}
Class VoidMain()
{
A a=new B();// Creating object for A class(can access the A
class data only).
B b=new B();// Creating object for B class(can access the
A,B class data).
}

Is This Answer Correct ?    12 Yes 3 No

There are a class A. Another class B derived from it. Now if I do A a = new B(); and B b = new B();..

Answer / nsy

In general, an object reference variable can refer only to
objects of its type.
There is, however, an important exception to C#’s strict
type enforcement. A reference variable of a base class can
be assigned a reference to an object of any class derived
from that base class.
It is important to understand that it is the type of the
reference variable—not the type of the object that it refers
to—that determines what members can be accessed. That is,
when a reference to a derived class object is assigned to a
base class reference variable, you will have access only to
those parts of the object defined by the base class.

Is This Answer Correct ?    6 Yes 3 No

Post New Answer

More C Sharp Interview Questions

How Global.asax is used ?

0 Answers   Siebel,


what are the bugs are faced in a project

3 Answers   Accenture,


How do you remove white spaces from a string?

0 Answers  


Is var a data type?

0 Answers  


what is scope of a protected internal member variable of a c# class

0 Answers   Cognizant,






What is the difference between readonly and constant in c#

2 Answers   Fulcrum Logic,


Can an array be null c#?

0 Answers  


How do I join one form to another in c#?

0 Answers  


Are there functions in c#?

0 Answers  


Can bool be null c#?

0 Answers  


what is the lifespan of the items stored in viewstate ?

4 Answers  


Can you explain template pattern?

0 Answers   QuestPond,


Categories