PRG521 Chap8

What is one advantage of interfaces in C# over abstract classes?

• They support multiple inheritance

• They provide default implementations for methods

• They allow for polymorphism without using up single-inheritance

• They can directly access private members of implementing classes

In C# 8.0/.NET Core 3.0, what feature allows interfaces to provide implementations for their members?

• Abstract methods

• Default interface members

• Extension methods

• Static methods

Which of the following accurately describes the relationship between interfaces and abstract classes in C#?

• Interfaces cannot have any implementation details

• Interfaces can inherit from abstract classes

• Interfaces can provide a superset of capabilities compared to abstract classes

• Abstract classes support multiple inheritance, while interfaces do not

How does C# handle the scenario where a class implements multiple interfaces with the same method signature?

• It throws a compilation error

• It allows the class to implement only one of the interfaces

• It requires the class to provide an explicit implementation for the method

• It allows the class to implement all the interfaces with the same method signature

What determines whether the implementation of an interface member in C# is explicit or implicit?

• The access modifier of the implementing class

• Whether the interface is marked as 'abstract'

• Whether the method is marked as 'virtual'

• Whether the member is directly exposed by the class or only via a conversion to the interface

Which version of C# introduced the concept of default interface members?

• C# 6.0

• C# 7.0

• C# 8.0

• C# 9.0

In C#, what happens when a class explicitly implements an interface member?

• The member cannot be accessed outside the class

• The member is accessed through a conversion to the interface type

• The member is accessed directly from the class instance

• The member is accessible only within the same assembly

What is the benefit of using default interface members in C#?

• They improve performance by reducing method lookup time

• They allow interfaces to inherit from classes

• They provide backward compatibility with older versions of C#

• They enable interfaces to include method implementations without breaking existing implementations