Thread: Which constructor will be called in main

Hi I have tried to compile this code,, but it gives me compilation error,,,,
The reason for that as my understanding is:
1. The order to invoke constructor is the most specific to generalize, hence "null" is not an identifier/keyowrd. and then non of constructor find that match ,, so throw an exception

it called default constructor but here not any constructor which accept null value, so it will give a compiler error.

It will not cll any of the constructor ...
It ll just give u an Compile time error sying like
constructor A is ambiguos

2nd contructor will be called

Compile time error will be caused.

No Constructor will be called.
Their must be an error..........

no constructor is invoked

what is the use of final class when we cannot not extend or import