1. Compilation Error
5. ClassC can not be cast to ClassB
Try to solve the challenge by yourself first!
It’s clearly 5th option is the answer because classC can not be cast to classB, which will be caused at line number 4, but that is not the case my friend, what happens is line number 4 will be replaced with —
return (ClassA) o;
So definitely it will not throw ClassCastException because ClassC can be cast to ClassA. Java generics are not reified here, meaning that in compile-time, the generic type information is “lost” and treated as if the code is replaced with the type’s bound or with Object if it doesn’t exist, which basically types erasure concepts.
So the answer will be
Thanks for your time.