Java challenge question

Question

Please, explain why
In Java challenge there is a question
"Constructor can be private"
The right answer is true.
How could it be?

Answer 1

Constructor modifiers (public, protected, private), follow the same rules as normal methods, except that an 'abstract' , 'static' or 'final' constructor is not allowed.

Answer 2

Class will be private , so constructor will be private, In google there are lot of example here.

Answer 3

~ swim ~ what is the main advantage of a singleton class over static classes?

Answer 4

Julia this should help
https://code.sololearn.com/cnUdTWuHTzkU/?ref=app

Answer 5

Constructors can be private, instatiating objects of classes with private constructors would require the use of a static method