About Question enthuware.ocajp.i.v7.2.951 :

[mihhay]

"For example, a Dog  "IS A" Animal, so you don't need to cast it. But an Animal may not always be a Dog. So you need to cast it to make it compile and during the runtime the actual object referenced by animal should be a Dog  otherwise it will throw a ClassCastException."

Reading this I was expecting to see ClassCastException...

I really really appreciate your wonderful explanation! Thank you!