Yes it will work.

It will work, because super() call from child constructor will call no arg constructor of parent which is by default provided by compiler. But if parent also have parameterized constructor then it will not work, because super() call from child constructor will not find no argument constructor in parent

Nope the old man is correct and u were wrong, the answer is it will not work

It will work. As constructor cannot be overriden. It can be just override in same class.

My answer is yes as java automatically provides a super call on first line of constructor . Interviewer who was almost 35-37 years old so at least have 10-15 years of experience dont know this concept and we argued on this after which i was told to work on my technical skills and I was like common man