FIquei com a mesma duvida, alguem para nos ajudar?

Boa tarde, Vinicius! Eu ainda não entendi muito bem, por isso espero que apareça alguém para nos ajudar, mas achei um site que explica isso.

O nome do tutorial é "Como ensinei polimorfismo ao meu cachorro?" hahaha

Esse trecho aqui explica, mas ainda não entendi certinho:

"So why not just use a generic collection like Vector? Can't you just put any object in there -- they don't even have to be from the same inheritance tree.

You've missed the point. A Vector would be less efficient, for one thing, and you'd have to cast the objects back to something more specific before you could call methods (other than, say, toString()).

What a pain. And that's not the main problem.

What if another programmer comes along after the guy who wrote the Animal program is gone? What if you don't even have his source code, but you need to add a new animal subclass like Cow? If all the different Animal subclasses had to be figured out, and cast, etc. then you could not add new Cow animals into the program without changing the original code.

But if the Animal program is simply expecting an array of Animals, then all I have to do is make my new Cow class a subclass of Animal, then it can be safely included in an Animal [] array and passed to a method in the Animal program."

https://javaranch.com/campfire/StoryPoly.jsp

se você ler e conseguir entender, me dá um toque!

Opa legal, gostei do site nao conhecia, valeu pela ajuda.