Monday, September 10, 2012

OOPs Reasoning FAQs-1

1Does c# support multiple-inheritance ?No. Multiple inheritance is not possible in .NET. This means it is not possible for one class to inherit from multiple classes. However, a class may implement multiple interfaces. We may also declare objects of different classes in a class. This way, the encapsulated class may be instantiated in other classes.
2Do events have return type ?Events do not have return type.
3Can you override private virtual methods ?No, we cannot access private methods in inherited classes.
4Can you allow class to be inherited, but prevent the method from being over-ridden ?
Yes, just leave the class public and make the method sealed.

Can we have shared events ?

Yes, we can have shared event’s note only shared methods can raise shared events.
Can you write a class without specifying namespace ? which namespace does it belong to by default ?

Yes, we can, then the class belongs to global namespace which has no name. For commercial products, naturally, we would not want global namespace.
7Can you prevent a class from overriding ?
Yes.If we define a class as “Sealed” in C# and “NotInheritable” in VB.NET we can not
inherit the class any further.
Are private class-level variables inherited ?

Yes, but they are not accessible. Although they are not visible or accessible via the class interface, they are inherited.
Can you declare the override method static while the original method is non-static?

No, we can't, the signature of the virtual method must remain the same, only the keyword virtual is changed to keyword override.

Can a constructors that is declared within a base class, inherited by subclasses ?

No, constructors that are declared within a base class cannot be inherited by sub-classes. If we have not declared any constructor in our class then a default constructor is provided.

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