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1 Abstract classes can extend other class and implement interfaces but interface can only extend other interfaces. 2  We can run an abstract class if it has main() method but we canât run an interface because they canât have main method implementation.
An important difference is that interfaces can have properties but not fields. This, to me, underlines that properties should be used to define a class's public interface while fields are meant to be used in the private, internal workings of a class.