Understanding Inheritance in C#

What are the main types of inheritance in C#?

• Single Inheritance, Multiple Inheritance (through interfaces), Multilevel Inheritance, Hierarchical Inheritance

• Circular Inheritance

• Abstract Inheritance

• Static Inheritance

Explain single inheritance and its advantages.

• Single inheritance is only applicable in functional programming languages.

• Single inheritance can lead to code duplication in large projects.

• Multiple inheritance allows for more complex relationships between classes.

• Advantages of single inheritance include simplicity in the class hierarchy, easier maintenance, reduced complexity, and improved code reusability.

What is multiple inheritance and how is it achieved in C#?

• Multiple inheritance is achieved through abstract classes in C#.

• C# does not support multiple inheritance at all.

• A class can inherit from multiple base classes directly in C#.

• In C#, multiple inheritance is achieved through interfaces, allowing a class to implement multiple interfaces.

Define method overriding in the context of C# inheritance.

• Method overriding allows a base class to change its own methods.

• Method overriding is used to create new methods in the base class.

• Method overriding prevents derived classes from accessing base class methods.

• Method overriding in C# allows a derived class to provide a specific implementation of a method that is already defined in its base class.

How does the 'virtual' keyword affect method overriding?

• The 'virtual' keyword prevents method overriding in derived classes.

• The 'virtual' keyword has no effect on method overriding.

• The 'virtual' keyword enables polymorphism and allows derived classes to override base class methods.

• The 'virtual' keyword is used to declare static methods only.

What is an abstract class and how is it used in C#?

• An abstract class in C# can be instantiated directly.

• An abstract class in C# is used to create concrete classes only.

• An abstract class in C# is a class that cannot be instantiated and is used to define a base class with abstract methods for derived classes to implement.

• An abstract class in C# cannot contain any methods or properties.

Can an abstract class have concrete methods?

• An abstract class can only have static methods.

• Yes, all methods in an abstract class must be abstract.

• Yes, an abstract class can have concrete methods.

• No, an abstract class cannot have any methods.

What is the purpose of an interface in C#?

• To provide a way to inherit implementation details.

• To create a new data type with properties.

• To define a contract for classes to implement.

• To manage memory allocation for classes.

How do interfaces differ from abstract classes?

• Interfaces allow multiple inheritance and only contain method signatures; abstract classes can provide implementation and cannot be instantiated.

• Abstract classes allow multiple inheritance and only contain method signatures.

• Interfaces cannot be inherited by multiple classes.

• Interfaces can be instantiated and contain method implementations.

What is polymorphism and how does it relate to inheritance?

• Polymorphism is a type of inheritance that only applies to abstract classes.

• Polymorphism allows different classes to be treated as instances of the same class through inheritance, enabling method overriding and dynamic behavior.

• Polymorphism is unrelated to inheritance and focuses solely on data encapsulation.

• Polymorphism restricts classes to a single method implementation.