Why up casting cause error here??

Question

https://code.sololearn.com/cfiHDp5n7kMB/?ref=app

Answer 1

the best example
https://code.sololearn.com/cge5K9ARPXlp/?ref=app

Answer 2

1) This is not casting, this is inheritance/polymorphism.

Anywho, the actual error is because you have 2 objects named "obj2".
change: a obj2 = new b(); to: a obj3 = new b();

There was also no reason to create the first 2 objects, they don't do anything.

Answer 3

This is nt up casting