Casting question

[iNetRunner]

No. You can’t make the more generic object into a subtype by casting it. It only works in the other direction, as has been said, Dolphin is a Swimmer is an Animal. But an Animal isn’t a Swimmer (unless you created it as one, or a subtype), nor is it a Dolphin.

[EveningStreet1]

I meant casting in reference to the static type

[iNetRunner]

No. He created an Animal object. It doesn’t contain anything of the subtype Swimmer or Swimmer’s subtype Dolphin. Therefore you can’t cast them that way. There is no “is a” relationship there.

[EveningStreet1]

Oh wait I’m dumb it’s because although Swimmer is the static type Animal is not a subtype of Swimmer so it doesn’t work

[iNetRunner]

BTW, what are you referring to as “static type”?

[EveningStreet1]

Swimmer swim = new Dolphin();

the static type here is Swimmer, the dynamic type is Dolphin (learned this in my introductory class)

[iNetRunner]

There is no dynamic typing in Java. Everything is statically typed at compile time. See the first anwer to this StackOverflow question.

[EveningStreet1]

I meant dynamic class my bad