Answer Posted / gkp

Abstract class and Interface are the design time decision. As we expect to extend our implementation in future so we need to give space to incorporate new implementation. As we know if some implementation of a method will be common in many classes then that method should be moved to abstract class so the repetition of same code can be avoided. Even though we don't have any abstract method in our abstract class, we can go for a abstract class. Generally in design of java classes, it is designed like, first an interface then an abstract class and then concrete class implementation starts.

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