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I got this question for homework, and I’m not sure how to answer it. Could you help me out?
For any kind of “why don’t…” question, it’s good to think about “what would happen if…”. In this case: What would happen if every Java class needed to have an interface? How would it change the existing APIs? How would it change things for people creating new classes? Any problems you find in answering these other questions could be answers to your original question.