INTERVIEW QUESTIONS J2EE JAVA DETAILS

Question: How can you force all derived classes to implement a method present in the base class?

Answer: Creating and implementing an interface would be the best way for this situation. Just create an interface with empty methods which forces a programmer to implement all the methods present under it. Another way of achieving this task is to declare a class as abstract with all its methods abstract.

Creating and implementing an interface would be the best way for this situation. Just create an interface with empty methods which forces a programmer to implement all the methods present under it. Another way of achieving this task is to declare a class as abstract with all its methods abstract. Source: CoolInterview.com

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