What is private constructor in Java example?

The use of private constructor is to serve singleton classes . A singleton class is one which limits the number of objects creation to one. Using private constructor we can ensure that no more than one object can be created at a time.

Yes, we can declare a constructor as private . If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.

Private constructors are used to prevent creating instances of a class when there are no instance fields or methods , such as the Math class, or when a method is called to obtain an instance of a class. If all the methods in the class are static, consider making the complete class static.12 Oca 2022

If a constructor is declared as private, then its objects are only accessible from within the declared class . You cannot access its objects from outside the constructor class.9 Nis 2021