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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.
When a Class implements an Interface are forced by the compiler to write the methods and Properties that the Interface has defined. That is, if you implement an Interface in your Class you have to declare all of the Interface's Events, Methods, Properties in your Class. An Interface can have only Abstract methods and Constants, which are always implicitly public, static, and final.