Black Jack in Java

Back in 2009 at the University we had to implement a game for mobile devices in J2ME. We chose Black Jack and I did the business logic.

The logic consists of 3 packages. The bl package implements interfaces from the interfaces package and the executable is in the game package.

So here is the code …

Package: game

/**
 *
 */
package bj.game.game;

import bj.game.bl.BjDeck;
import bj.game.bl.BjGame;
import bj.game.bl.BjPlayer;
import bj.game.bl.BjPlayerTyp;
import bj.game.interfaces.Deck;
import bj.game.interfaces.Game;
import bj.game.interfaces.Player;

/**
 * @author Dzenan Hamzic
 *
 */
public class RunGame {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        //Deck deck = new BjDeck();

        //List<Card>; cards= deck.getCards();

        // list all cards in deck
        /*
        for (Card card : cards) {
            System.out.println(card.getTyp() + &quot; &quot; + card.getValue());
        }
        */
        Player dealer = new BjPlayer(BjPlayerTyp.DEALER);
        Player looser = new BjPlayer(BjPlayerTyp.PLAYER);

        /*
        dealer.getCards(deck.deal());
        looser.getCards(deck.deal());

        System.out.println(&quot;dealers cards&quot;);
        dealer.showCards();
        System.out.println(&quot;loosers cards&quot;);
        looser.showCards();

        System.out.println(&quot;dealers takes card...&quot;);
        dealer.takeCard(deck.getRandomCard());
        System.out.println(&quot;looser takes card...&quot;);
        looser.takeCard(deck.getRandomCard());

        System.out.println(&quot;dealers cards&quot;);
        dealer.showCards();
        System.out.println(&quot;loosers cards&quot;);
        looser.showCards();
        */
        //------------------------
        Game newGame = new BjGame(dealer, looser);

        newGame.start();

    }

}

Package: interfaces

package bj.game.interfaces;

import bj.game.bl.BjCardTyp;

/**
 * @author Dzenan Hamzic
 *
 */
public interface Card {
 public int getValue();

 public void setUsed(boolean used);
 public boolean isUsed();

 public BjCardTyp getTyp();
 public void setTyp(BjCardTyp typ);

 public void setPhoto(String path);
 public String getPhoto();
}


/**
 *
 */
package bj.game.interfaces;

/**
 * @author Dzenan Hamzic
 *
 */
public interface Constants {
 static int START_PLAYER_MONEY_AMOUNT = 1000;
 static int START_DEALER_MONEY_AMOUNT = 100000;
 static final int CARD_SUM = 21;
}

/**
 *
 */
package bj.game.interfaces;

import java.util.List;

/**
 * @author Dzenan Hamzic
 *
 */
public interface Deck {
 public List getCards();
 public int getSize();
 public void shuffle();
 public List deal();
 public Card getRandomCard();
}

package bj.game.interfaces;

/**
 * @author Dzenan Hamzic
 *
 */

public interface Game {

 public void initialize();
 public void start();
 public void showResults();
 public void quit();
 public void showPlayerMoney();
 public void addMoneyInGame(int money);
 public int showMoneyInGame();
 public void dealerWon();
 public void playerWon();
 public void tie();
 boolean checkPlayersCards(int choice);

 /**
 * check if dealer has less than 17 and give one more card
 */
 public void checkDealersCardsSum();
}

package bj.game.interfaces;

import java.util.List;

import bj.game.bl.BjPlayerTyp;

public interface Player {
 public void showCards(boolean b);
 public void setCards(List cards);
 public void takeCard(Card card);
 public BjPlayerTyp getTyp();
 public int getMoney();
 public void setMoney(int money);
 public void winMoney(int amount);
 public void selectChip(int amount);
 public void fold();
 public int checkCardsSum();
}

Package: bl (business logic)

/**
 *
 */
package bj.game.bl;

import bj.game.interfaces.Card;

/**
 * @author Dzenan Hamzic
 *
 */
public class BjCard implements Card {

 private boolean used;
 private BjCardTyp typ;
 private int value;
 private String photoPath;
 /* (non-Javadoc)
 * @see bj.game.interfaces.Card#getUsed()
 */

 public BjCard(BjCardTyp typ, int value) {
 super();
 this.used = false;
 this.typ = typ;
 this.value = value;
 }

 @Override
 public boolean isUsed() {
 return this.used;
 }

 /* (non-Javadoc)
 * @see bj.game.interfaces.Card#getValue()
 */
 @Override
 public int getValue() {
 return this.value;
 }

 /* (non-Javadoc)
 * @see bj.game.interfaces.Card#setUsed()
 */
 @Override
 public void setUsed(boolean used) {
 this.used = used;
 }

 @Override
 public BjCardTyp getTyp() {
 return this.typ;
 }

 @Override
 public void setTyp(BjCardTyp typ) {
 this.typ = typ;
 }

 @Override
 public String getPhoto() {
 return this.photoPath;
 }

 @Override
 public void setPhoto(String path) {
 this.photoPath = path;
 }

 @Override
 public String toString(){
 return typ.toString() + &quot; &quot; + value;
 }

}

/**
 *
 */
package bj.game.bl;

/**
 * @author Dzenan Hamzic
 *
 */
public enum BjCardTyp {
 NORMAL,
 AS,
 JOKER,
 QUEEN,
 KING;
}

/**
 *
 */
package bj.game.bl;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import bj.game.interfaces.Card;
import bj.game.interfaces.Deck;

/**
 * @author Dzenan Hamzic
 *
 */
public class BjDeck implements Deck {

 private static final int CARD_NUMBER = 51;
 private List cards;
 private Random R;

 public BjDeck() {
 super();
 cards = new ArrayList<Card>();
 R = new Random();
 initialize(cards);
 }

 private void initialize(List cards){
 Card card;

 int i, k;
 // four aces AS
 for(i=0;i&amp;lt;4;i++){
 card = new BjCard(BjCardTyp.AS, 1);
 cards.add(card);
 }

 // 2,3,4,5,6,7,8,9,10 x 4
 for(i = 2; i &amp;lt; 11; i++){
 for(k=0;k &amp;lt; 4;k++){
 card = new BjCard(BjCardTyp.NORMAL, i);
 cards.add(card);
 }
 }

 // four Jokers
 for(i=0;i &amp;lt; 4;i++){
 card = new BjCard(BjCardTyp.JOKER, 10);
 cards.add(card);
 }

 // four Queens
 for(i=0;i &amp;lt; 4;i++){
 card = new BjCard(BjCardTyp.QUEEN, 10);
 cards.add(card);
 }

 // four Kings
 for(i=0;i &amp;lt; 4;i++){
 card = new BjCard(BjCardTyp.KING, 10);
 cards.add(card);
 }

 }

 /* (non-Javadoc)
 * @see bj.game.interfaces.Deck#deal()
 */
 @Override
 public List<Card>; deal() {
 List<Card>; output = new ArrayList<Card>;(2);
 output.add(getRandomCard());
 output.add(getRandomCard());
 return output;
 }

 /* (non-Javadoc)
 * @see bj.game.interfaces.Deck#getSize()
 */
 @Override
 public int getSize() {
 return this.cards.size();
 }

 /* (non-Javadoc)
 * @see bj.game.interfaces.Deck#shuffle()
 */
 @Override
 public void shuffle() {
 for (Card card : this.cards) {
 card.setUsed(false);
 }
 }

 @Override
 public List<Card>; getCards() {
 return this.cards;
 }

 @Override
 public Card getRandomCard() {
 int randomNr = 0;
 Card randomCard = null;
 try {
 randomNr = R.nextInt(CARD_NUMBER);
 randomCard = cards.get(randomNr);
 if (randomCard.isUsed()) {
 getRandomCard();
 }
 randomCard.setUsed(true);

 } catch (StackOverflowError e) {
 System.out.println(&quot;error with random: &quot; + randomNr);
 }
 return randomCard;
 }

}

package bj.game.bl;

import java.util.Scanner;

import bj.game.interfaces.Constants;
import bj.game.interfaces.Deck;
import bj.game.interfaces.Game;
import bj.game.interfaces.Player;
/**
 * @author Dzenan Hamzic
 *
 */
// this should be threaded!
public class BjGame implements Game {

 private Deck deck;
 private Player dealer;
 private Player looser;

 private int moneyInGame;
 private boolean started;
 private BjPlayerTyp winner;

 private Scanner scan;

 public BjGame(Player dealer, Player looser) {
 super();
 this.deck = new BjDeck();
 this.dealer = dealer;
 this.looser = looser;
 this.scan = new Scanner(System.in);
 initialize();
 }

 @Override
 public void quit() {

 }

 @Override
 public void showResults() {
 if(winner == BjPlayerTyp.DEALER)
 System.out.println(&quot;YOU LOST!&quot;);
 else if(winner == BjPlayerTyp.PLAYER)
 System.out.println(&quot;YOU WON!&quot;);
 else
 System.out.println(&quot;TIE&quot;);
 showPlayerMoney();
 }

 @Override
 public void start() {
 started = true;

 while(started){
 this.showPlayerMoney();
 // wait for user to insert money
 // inserting chips
 System.out.println(&quot;insert some money&quot;);
 addMoneyInGame(scan.nextInt());

 this.showMoneyInGame();
 this.showPlayerMoney();

 // dealing cards
 dealer.setCards(deck.deal());
 looser.setCards(deck.deal());

 gameLoop();
 }
 showResults();
 playSomeMore();
 }

 private void playSomeMore() {
 if(looser.getMoney() &gt; 0){
 System.out.println(&quot;continue playing? y/n&quot;);
 String input = scan.next();
 if(input.equals(&quot;y&quot;)){
 moneyInGame = 0;
 deck.shuffle();
 start();
 }else
 quit();
 }

 }

 private void gameLoop(){
 // showing cards
 dealer.showCards(false);
 looser.showCards(false);

 System.out.println(&quot;waiting for user to take action...&quot;);
 System.out.println(&quot;1 hit me, 2 stand&quot;);
 // hit me or stand

 int input = scan.nextInt();
 if(checkPlayersCards(input)){ // should I continue?
 gameLoop();
 }else{
 started = false;
 }
 }

 @Override
 public void initialize() {
 moneyInGame = 0;
 this.dealer.setMoney(Constants.START_DEALER_MONEY_AMOUNT);
 this.looser.setMoney(Constants.START_PLAYER_MONEY_AMOUNT);
 }

 @Override
 public void showPlayerMoney() {
 System.out.println(&quot;Currently You have : &quot; + this.looser.getMoney() + &quot; chips left!&quot;);

 }

 @Override
 public void addMoneyInGame(int money) {
 this.moneyInGame += money;
 this.looser.setMoney(this.looser.getMoney()-money);

 }

 @Override
 public int showMoneyInGame() {
 return this.moneyInGame;
 }

 @Override
 public boolean checkPlayersCards(int choice) {
 boolean weiter = true;
 if(choice == 1){// hit me
 this.looser.takeCard(this.deck.getRandomCard());// take another card
 looser.showCards(false);

 if(looser.checkCardsSum() &gt; Constants.CARD_SUM &amp;&amp; dealer.checkCardsSum() &lt;= 21){
 dealerWon();
 weiter = false;
 }
 if(looser.checkCardsSum() == Constants.CARD_SUM &amp;&amp; (dealer.checkCardsSum() &lt; 21 || dealer.checkCardsSum() &gt; 21) &amp;&amp; looser.checkCardsSum() != dealer.checkCardsSum() ){
 // player won
 playerWon();
 weiter = false;
 }
 if(looser.checkCardsSum() == dealer.checkCardsSum()){
 // tie
 tie();
 weiter = false;
 }

 }else{// stand
 checkDealersCardsSum();
 dealer.showCards(true);
 if(looser.checkCardsSum() &gt; dealer.checkCardsSum() || (dealer.checkCardsSum()&gt;21 &amp;&amp; dealer.checkCardsSum() != 21))
 playerWon();
 else if(looser.checkCardsSum() == dealer.checkCardsSum())
 tie();
 else
 dealerWon();

 weiter = false;
 }
 return weiter;
 }

 @Override
 public void dealerWon() {
 started = false;
 winner = BjPlayerTyp.DEALER;
 }

 @Override
 public void playerWon() {
 started = false;
 looser.setMoney(looser.getMoney()+2*moneyInGame);
 winner = BjPlayerTyp.PLAYER;
 }

 @Override
 public void tie() {
 started = false;
 looser.setMoney(looser.getMoney()+moneyInGame);
 winner = null;
 }

 /*
 * (non-Javadoc)
 * @see bj.game.interfaces.Game#checkDealerCards()
 */
 @Override
 public void checkDealersCardsSum() {
 if(dealer.checkCardsSum() &lt; 17)
 dealer.takeCard(deck.getRandomCard());
 if(dealer.checkCardsSum() &lt; 17)
 checkDealersCardsSum();
 }

}

/**
 *
 */
package bj.game.bl;

import java.util.ArrayList;
import java.util.List;

import bj.game.interfaces.Card;
import bj.game.interfaces.Player;

/**
 * @author Dzenan Hamzic
 *
 */
public class BjPlayer implements Player{

 private List&lt;Card&gt; cards;
 private BjPlayerTyp typ;
 private int money;

 public BjPlayer(BjPlayerTyp typ) {
 this.cards = new ArrayList&lt;Card&gt;();
 this.typ = typ;
 }

 @Override
 public void showCards(boolean b) {
 System.out.println(this.typ + &quot; has: &quot;);
 for (Card card : this.cards) {
 System.out.println(card);

 // show only first card from dealer
 if(this.typ == BjPlayerTyp.DEALER &amp;&amp; b == false)
 return;
 }
 System.out.println(&quot;-------&quot;);
 System.out.println(checkCardsSum());
 }

 @Override
 public void setCards(List&lt;Card&gt; cards) {
 this.cards = cards;
 }

 @Override
 public void takeCard(Card card) {
 this.cards.add(card);
 }

 @Override
 public BjPlayerTyp getTyp() {
 return typ;
 }

 @Override
 public void fold() {
 // TODO Auto-generated method stub

 }

 @Override
 public int getMoney() {
 return this.money;
 }

 @Override
 public void selectChip(int amount) {
 this.money -= amount;
 }

 @Override
 public void winMoney(int amount) {
 this.money += amount;

 }

 @Override
 public void setMoney(int money) {
 this.money = money;
 }

 @Override
 public int checkCardsSum() {
 int sum = 0;
 for(Card card: this.cards)
 sum += card.getValue();
 return sum;
 }

}

/**
 *
 */
package bj.game.bl;

/**
 * @author Dzenan Hamzic
 *
 */
public enum BjPlayerTyp {
 DEALER, PLAYER;
}

Feel free to use the code as you wish.

Cheers!

Published by dzhamzic

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