Query on constructor

arun_babu_a · October 27th, 2011, 07:47 AM

Can someone explain whats the need for adding a default constructor(private)
in the card class

Code:

public class Card
    {
        public readonly Rank rank;
        public readonly Suit suit;

public Card(Suit newSuit,Rank newRank )
        {
            suit = newSuit;
            rank = newRank;
        }
        private Card()
        { 
        }

ChristianNagel · October 27th, 2011, 08:11 AM

The private default constructor can only be invoked within the class Card itself. From outside of the class you can only invoke the constructor with the Suit and Rank parameters.
If the private constructor is not used within the Card class itself it's not needed: if a constructor with parameters is declared, a default constructor is not created anymore.
With the private constructor the Card class could have a method to create a new instance without passing Suit and Rank.