Yhere are 4 levels of protection in Java:
Public - anyone can access this.
(blank - pakage) - all classes in the same package can access.
Protected - package level + child classes can access.
Private - no one can access except the implementing class.

These levels are based on Object-Oriented Programming principles.

Thus, there is no way to access a Private constructor outside of the
implementing class. The java  compiler (javac) and all IDEs that I know
of forbid it.