What's the purpose of UPCASTING and DOWNCASTING in java..?

Question

Help me...i can't understand the concept

Answer 1

i found this which is straight to the point

Upcasting is casting to a supertype, while downcasting is casting to a subtype. Upcasting is always allowed, but downcasting involves a type check and can throw a ClassCastException.

Answer 2

thanx @David