Can we override constructor in Java? If yes then how, if no then why?

Answer 1

No, You cannot override constructor of super class in sub class, In java overriding applicable to only instance methods as constructor in not treated as instance method it is specifically used to create object for the class

Answer 2

In Java, you can subclass (use extends keyword) or implement an interface.
You can also override the constructor including default constructor to write own code (generally for initialization).
Exceptions in Java are the classes that are singleton class or having private constructor, e.g Maths class.