OOPs Reasoning FAQs-1

OOPs Reasoning FAQs-1

S.No	Questions	Answers
1	Does 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.
2	Do events have return type ?	Events do not have return type.
3	Can you override private virtual methods ?	No, we cannot access private methods in inherited classes.
4	Can 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.
5	Can we have shared events ?	Yes, we can have shared event’s note only shared methods can raise shared events.
6	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.
7	Can 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.
8	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.
9	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.
10	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.