The conversation between human and AI assistant.
In Java, when should you use an interface instead of an abstract class?
I see. And when might you prefer to use an abstract class instead?
Well, let's say you have a set of classes that all represent different shapes, like circles and squares. Each of these shapes will have an area and a perimeter. Instead of defining those methods in each class, you could define an abstract class called Shape that has the area and perimeter methods defined. Each shape would then extend the Shape class and implement any additional methods it needs.