Two of the key concepts in object-oriented programming (OOP) are inheritance and composition. While both can help you reuse code, there are key differences between them.

In object-oriented programming, we can use inheritance when we know there is an “is a” relationship between a child and its parent class. Some examples would be: A person is a human.

While there are workarounds -- for example, you could introduce a Factory class to generate transaction objects -- this adds complexity and could become a maintenance burden. Another approach could be ...