OOP puts data and behavior together in objects. Which is 100% compatible with functional programming. It is mutability that is incompatible with FP, but mutabi

OOP puts data and behavior together in objects. Which is 100% compatible with functional programming. It is mutability that is incompatible with FP, but mutability is a property of imperative programming, not of OOP. It is even possible to have 100% purely functional Java, for example, if you just eschew mutability.