Interfaces - Features,Properties - Csharp.Net
Q. Which of the following are correct?
1. An interface can be instantiated directly.
2. Interfaces can contain constructor.
3. Interfaces contain no implementation of methods.
4. Classes and structs can implement more than one interface.
5. An interface itself can inherit from multiple interfaces.
- Published on 31 Aug 15a. 3,4,5
b. 1,2,3
c. 2,3,4
d. All of the above
ANSWER: 3,4,5
Interfaces are like classes but we cannot provide definition of methods in interface. We can only declare the methods not implementation in interface. A class must implement all its members that is inheriting the interface.
An interface has the following properties:
• An interface cannot be instantiated directly.
• Interfaces can contain events, indexers, methods and properties.
• Interfaces contain no implementation of methods.
• Classes and structs can inherit from more than one interface.
• An interface can itself inherit from multiple interfaces.
