oop - What is the use of making constructor private in a class?

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Why should we make the constructor
private in class? As we always need the constructor to be public.

Answer

Some reasons where you may need private
constructor:

1. The
   constructor can only be accessed from static factory method
   inside the class itself. Singleton can also belong to this
   category.



2. A utility
   class, that only contains static
   methods.