Why would both a parent and child class implement the same interface?

Question

I inherited some legacy Java (1.4) code and this design decision appears regularly. I can\'t understand if there\'s any purpose or reason to it.

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Answer 1

I actually find that design pointless. Implemented interfaces, as you stated, are just inherited, so there's no need to copy and paste "implements SomeInterface" on the children classes. It's not clearer, smarter, or whatsoever...