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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 abstract method is implicitly a virtual method. Abstract method declarations are only permitted in abstract classes. The implementation is provided by an overriding method, which is a member of a non-abstract class. It is an error to use the static or virtual modifiers in an abstract method declaration.