How to create objects from a class with private constructor?

Question

I have a class Game that is my main class and a second class Card. Class Card hast its properties and constructor private, only function init is public. Function init checks

Answer 1

public class demo
{
    private demo()
    {

    }
    public static demo getObject()
    {
        return new demo();
    }

    public void add()
    {

    }
}
class Program
{
    static void Main(string[] args)
    {
        demo d1 = demo.getObject();
        d1.add();
    }
}