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Posted 24 Aug 2007


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Blackjack Game Simulator

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4.26/5 (10 votes)
24 Aug 2007CPOL3 min read
Framework for blackjack game simulation
Screenshot - blackjack.png


This project provides a framework for a blackjack game simulator. I don't know if this will be useful to someone... Well, it could be useful to gamblers for testing tactics they have heard of. I had to do a presentation, so I hacked something together and in the end, I got this, so it leaves many places for improvement. For more information about the blackjack game and rules, Wikipedia's article is a nice place to start.

Using the Code

The solution contains five components:

  • BlackJack - GUI application
  • Common - Common classes, enums and interfaces used by the framework
  • Game - Component that takes care of blackjack game logic
  • Player - Very simple computer player
  • HumanPlayer - Simple interface for human players
Screenshot - app.png
Figure: Component diagram

Common Component

The Common component contains:

  • Deck class - managing card deck
  • Hand class - managing player's hand
  • IPlayer interface - interface for blackjack players
  • PlayerOptions enum - possible options on player's turn
  • PlayerInGameStatus enum - current player status (playing or standing)
  • PlayerEndGameStatus enum - player status at the end of the game (winner, loser...)

IPlayer's methods are called by the Game component to notify the player about events.

Game Component

The Game component contains:

  • PlayerStatus class - wrapper class for player; data such as current player's hand and current status are stored in this class to prevent cheating :)
  • Game class - blackjack game logic and control
  • PlayerDirectory class - dynamically loads the player's components

Simplified algorithm of the game:

  1. Start a new game
  2. Shuffle the deck
  3. Begin a new round
  4. Deal two cards to all players
  5. Ask all players with the status "playing" if they want another card: if someone does, give them another card; if someone doesn't, change his status to "standing"
  6. Repeat step 5 while there are players with "playing" status
  7. Compare players' hands to declare winner and losers according to the rules of the game, updating player statistics and end game status
  8. Shuffle, deal cards and return them to the end of the deck
  9. If this is not the last round, jump to step 3.

The described algorithm is implemented in the Round, BeginRound, PlayerTurn, GiveCardToPlayer and EndRound methods of the Game class. Game can be observed with events (members of the Game class):

  • OnRoundEnd
  • OnGameEnd
  • OnPlayerAdded
  • OnPlayerRemoved
  • OnPlayerListCleared
  • OnDealerChange

Game runs in its own thread and has methods for synchronization with GUI animations, which are played at the end of a round. At round end, the game thread calls WaitForAnimation and waits until the GUI thread signals that the animation is finished by calling AnimationFinished. Methods StartGame, StopGame, PauseGame and ContinueGame are used to control the game.

Loading and Instantiation of Players

The PlayerDirectory class has the tasks of loading players' components and instantiation of players. In the class constructor, all assemblies from the .\Players folder are checked and loaded if containing a player's class. The name of a player class must be MyPlayer and must be in the Player namespace.

Other assemblies can be added by calling the LoadPlayer method and specifying the path to assembly. To create an instance of a player, just call CreateInstanceOfPlayer, specifying the assembly name and constructor parameters as needed.

    new object[]{ "Someone", 30 } );

Simple Player

A simple player with simple logic:

  • "If I have blackjack, I'll stand"
  • "If I have 21, I'll stand"
  • "If have more than or equal to 17, I'll stand"
  • "If I have less than 17, I'll take another"

...can be implemented in a few lines of code.

using Common;
namespace Player
    public class MyPlayer : IPlayer
        private Hand _myHand = new Hand();

        private string _name;
        public string Name { get { return _name; } }

        public void NewRound(bool newGame, 
            bool isDealer, int dealersFirstCard, int numberOfDecks)
        { _myHand.Restart(); }

        public PlayerOptions Turn(int left)
            if (_myHand.IsBlackJack || _myHand.Values.Contains(21))
                return PlayerOptions.Stand;

            return _myHand.Values[0] <= 
                17 ? PlayerOptions.Hit : PlayerOptions.Stand;

        public void GiveCard(int card) { _myHand.Add(card); }

        public void EndRound(PlayerEndGameStatus status, 
            List<int> dealedCards) { }

        public MyPlayer(string name) { _name = name; }

        public MyPlayer() { _name = "strange name " + 
            GetHashCode().ToString(); }

Framework Project

The framework project provides an easy way of testing a player's logic with complete setup of environment and project. All unneeded source code has been stripped.

Additional Information

Like I said, there's room for many improvements (i.e. cards should be presented by class not integer number, animation code can be improved). Also, some rules from blackjack are not implemented, like the split option for players.

Points of Interest

Well, my college has had some fun making smarter players and had a little competition. I hope you will enjoy it, too.


  • 24 August, 2007 -- Original version posted


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Mladen Janković
Software Developer
Serbia Serbia
No Biography provided

Comments and Discussions

GeneralMy vote of 4 Pin
Perić Željko7-Apr-12 23:25
professionalPerić Željko7-Apr-12 23:25 

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