an obj ref = a remote control

each rcontrol is programmed to a target.
u can program your rcontrol to an Animal, or a Mammal, or a Dog, or erase all programming.

When your rcontrol is programmed for an Animal, bark() method is not available — the “bark” button is in a detachable extension and removed from the rcontrol. You need to cast.

Q: objects are passed by…?
A: well, u duplicate the rcontrol. A method receiving an arg need to duplicate the rcontrol and can’t reprogram the original rcontrol

Q: FINAL var (of a ref type) means?
A: non-reprogramable

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