There may be instances when many classes are implemented on the same level of inheritance or implement the same interface in the design of complicated applications. When new classes are added at the same level in such situations, it gets harder and harder to manage modifications and the ability to create specific objects with little code changes.
This article will describe how the factory design pattern may be used to simplify object generation when numerous classes implement the same interface or have similar implementations. We will describe what it actually is, the issues it resolves, its advantages and disadvantages, and how to use it in Delphi.
https://www.softacom.com/blog/factory_method_pattern_in_delphi/
