When should I use interfaces instead of abstract classes?

When should I use interfaces instead of abstract classes?

You should use interfaces when you want to define a contract for classes without enforcing a specific implementation. Abstract classes are better when you want to share code among related classes.

Can you give me an example of when to use an interface?

Sure! If you have multiple classes like 'Car' and 'Bike' that need to implement a 'Drive' method, you can define an interface 'IDriveable' for that purpose.

What are the advantages of using interfaces?

Interfaces promote loose coupling and allow for multiple inheritance, enabling a class to implement multiple interfaces.

Are there any downsides to using interfaces?

One downside is that interfaces cannot provide any implementation, so you may need to duplicate code across classes that implement the same interface.