Differences between Java Abstract classes and interfaces

In a sense, an interface is a special abstract class, but it is not a class. Abstract classes cannot be used as instances. abstract classes can have abstract methods or common methods. abstract classes can have common attribute values or constants. interfaces can only contain abstract methods, can have constants. When a class is defined, an abstract class should be used. Otherwise, an interface is used. The class can only be single-inherited, and the interface can be implemented multiple times.

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