An interface requires implementation of the specified functions in a class that implements the interface.An abstract function from an abstract class requires implementation in a class that extends the abstract class.They are essentially the same things, and I don't really see the difference. I've had a look at similar questions, and the answers still don't make much sense.Can someone explain all the differences in-depth, and practical examples of when you would use either?
What is the difference between an abstract method and an interface
object oriented;object oriented design
An abstract method is one method. An abstract class can contain several methods, and so can an interface. The difference between those two is that an abstract class can have implementations for some of its methods, while an interface doesn't have any implementations. (Usually. Java now allows default implementations even in interfaces, but try not to let that confuse you. Java is a bit of a special case, where the main difference between interfaces and abstract classes is that you can inherit only once, but can implement any number of times. Other languages with multiple inheritance don't have that limitation.)