Why does it return null

Question

Check my code
https://code.sololearn.com/c5UKWCbuI7Cj/?ref=app

Answer 1

That's because you're not passing in the correct arguments to your superclass when you call super(). So, change line 26 to:

super(a, b);

Also, you don't need that constructor on line 13. If you didn't have that, the way you coded it would've thrown an error instead of printing null.

Answer 2

Thank you for the answer, btw constructor on line 13 is on purpose ( in another case where i want to initialize object)