What is private constructor in Dart?

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.

A constructor can be made private by using (_) underscore operator which means private in dart. The same theory applied while extending class also, It’s also impossible to call the private constructor if it declares in a separate file.13 Mar 2019

Defenition – Private Constructor _. Private Constructor – is an exclusive instance constructor that restricts this class from being instantiated in other classes . This class is mainly used when you need to have static members only e.g static variables or static methods.

Defenition – Private Constructor _. Private Constructor – is an exclusive instance constructor that restricts this class from being instantiated in other classes . This class is mainly used when you need to have static members only e.g static variables or static methods.

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.