"Composition and Inheritance are the atoms of Pure OOO design.
One can't be replaced by others. Two have their own purpose, Most of the time developers use Inheritance in the wrong way and it looks Composition is the better option.
One of the signs of using Inheritance the wrong way if you suppress a parent method by throwing "not implemented exception" or by silent/empty implementation.
To restrict that silly mistakes, Seniors often giving the above mantras without thinking about the context, but it does not fit always."
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