Thursday, September 27, 2007

C# Interview Questions -2

Question Can you override private virtual methods?
Answer: No, moreover, you cannot access private methods in inherited classes, have to be protected in the base class to allow any sort of access.

Question Can you prevent your class from being inherited and becoming a base class for some other classes?
Answer: Yes, that’s what keyword sealed in the class definition is for. The developer trying to derive from your class will get a message: cannot inherit from Sealed class WhateverBaseClassName. It’s the same concept as final class in Java.

Question Can you allow class to be inherited, but prevent the method from being over-ridden?
Answer: Yes, just leave the class public and make the method sealed.

Question What’s an abstract class?
Answer: A class that cannot be instantiated. A concept in C++ known as pure virtual method. A class that must be inherited and have the methods over-ridden. Essentially, it’s a blueprint for a class without any implementation.

Question When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choice or decision based on UML diagram)?
Answer: When at least one of the methods in the class is abstract. When the class itself is inherited from an abstract class, but not all base abstract methods have been over-ridden.

Question What’s an interface class?
Answer: It’s an abstract class with public abstract methods all of which must be implemented in the inherited classes.

Question Why can’t you specify the accessibility modifier for methods inside the interface?
Answer: They all must be public. Therefore, to prevent you from getting the false impression that you have any freedom of choice, you are not allowed to specify any accessibility, it’s public by default.

Question Can you inherit multiple interfaces?
Answer: Yes, why not.

Question And if they have conflicting method names?
Answer: It’s up to you to implement the method inside your own class, so implementation is left entirely up to you. This might cause a problem on a higher-level scale if similarly named methods from different interfaces expect different data, but as far as compiler cares you’re okay.

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