What are the best practices for using interfaces in Java?

What are the best practices for using interfaces in Java?

Some best practices include: 1) Use interfaces to define contracts for classes, 2) Keep interfaces focused and cohesive, 3) Prefer interfaces over abstract classes, and 4) Use default methods judiciously.

Can you explain why it's better to use interfaces over abstract classes?

Interfaces allow for multiple inheritance, meaning a class can implement multiple interfaces, while a class can only extend one abstract class. This promotes flexibility in design.

What do you mean by keeping interfaces focused and cohesive?

A focused interface should have a specific purpose and not try to do too much. Cohesion means that the methods in the interface should be related to each other, making it easier to understand and implement.

Are there any common mistakes to avoid when designing interfaces?

Yes, common mistakes include creating overly large interfaces, not using meaningful names, and failing to document the intended use of the interface.