can Reference be NULL or NOt?

Question

if reference can't be null..then

Application obj;

Application is a class...

how the value of obj is NULL???

Answer 1

In your example obj is a reference with type Application. You didn't assign an object to it so its value is null by default. It means that this reference is empty.

Answer 2

Wait! What I write is true in Java (you added Java tag too) but a reference cannot be null in C++ but it is possible to reference to an invalid object.

Answer 3

Yes.

Answer 4

Not right. Can you write a simple test app in Java? Try this in Code Playground:

public class Program
{
public static void main(String[] args) {
String s = null;
System.out.println(s);
}
}

Answer 5

so...reference can be null??

Answer 6

but i have attended an interview..he told difference between pointer and reference is pointer can be null but reference can not be null