Extend the DeckofCards class to implement a BlackJack class, which implements a

Question

Extend the DeckofCards class to implement a BlackJack class, which implements a BlackJack game.

import java.util.Random;

class Card
{
private String face; // face of card ("Ace", "Deuce", ...)
private String suit; // suit of card ("Hearts", "Diamonds", ...)

// two-argument constructor initializes card's face and suit
public Card( String cardFace, String cardSuit )
{
face = cardFace; // initialize face of card
suit = cardSuit; // initialize suit of card
} // end two-argument Card constructor

// return String representation of Card
public String toString()
{
return face + " of " + suit;
} // end method toString
} // end class Card

public class DeckOfCards
{
private Card deck[]; // array of Card objects
private int currentCard; // index of next Card to be dealt
private final int NUMBER_OF_CARDS = 52; // constant number of Cards
private Random randomNumbers; // random number generator

// constructor fills deck of Cards
public DeckOfCards()
{
String faces[] = { "Ace", "Deuce", "Three", "Four", "Five", "Six",
"Seven", "Eight", "Nine", "Ten", "Jack", "Queen", "King" };
String suits[] = { "Hearts", "Diamonds", "Clubs", "Spades" };

deck = new Card[ NUMBER_OF_CARDS ]; // create array of Card objects
currentCard = 0; // set currentCard so first Card dealt is deck[ 0 ]
randomNumbers = new Random(); // create random number generator

// populate deck with Card objects
for ( int count = 0; count < deck.length; count++ )
deck[ count ] =
new Card( faces[ count % 13 ], suits[ count / 13 ] );
} // end DeckOfCards constructor

// shuffle deck of Cards with one-pass algorithm
public void shuffle()
{
// after shuffling, dealing should start at deck[ 0 ] again
currentCard = 0; // reinitialize currentCard

// for each Card, pick another random Card and swap them
for ( int first = 0; first < deck.length; first++ )
{
// select a random number between 0 and 51
int second = randomNumbers.nextInt( NUMBER_OF_CARDS );

// swap current Card with randomly selected Card
Card temp = deck[ first ];
deck[ first ] = deck[ second ];   
deck[ second ] = temp;
} // end for
} // end method shuffle

// deal one Card
public Card dealCard()
{
// determine whether Cards remain to be dealt
if ( currentCard < deck.length )
return deck[ currentCard++ ]; // return current Card in array
else
return null; // return null to indicate that all Cards were dealt
} // end method dealCard
} // end class DeckOfCards

public class DeckOfCardsTest
{
// execute application
public static void main( String args[] )
{
DeckOfCards myDeckOfCards = new DeckOfCards();
myDeckOfCards.shuffle(); // place Cards in random order
  
// print all 52 Cards in the order in which they are dealt
for ( int i = 0; i < 13; i++ )
{
// deal and print 4 Cards
System.out.printf( "%-20s%-20s%-20s%-20s ",
myDeckOfCards.dealCard(), myDeckOfCards.dealCard(),
myDeckOfCards.dealCard(), myDeckOfCards.dealCard() );
} // end for
} // end main
} // end class DeckOfCardsTest

Explanation / Answer

import random SUITS = ['Clubs', 'Spades', 'Hearts', 'Diamonds'] RANKS = ['2', '3', '4', '5', '6', '7', '8', '9', '10', 'J', 'Q', 'K', 'A'] MAX_PLAYERS = 8 MAX_BALANCE = 1000 chip_balance = 0 class Card(object): def __init__(self, suit, rank): self.suit = suit self.rank = rank if rank == 'A': self.point = 11 elif rank in ['K', 'Q', 'J']: self.point = 10 else: self.point = int(rank) self.hidden = False def __str__(self): if self.hidden: return '[X]' else: return '[' + self.suit + ' ' + self.rank + ']' def hide_card(self): self.hidden = True def reveal_card(self): self.hidden = False def is_ace(self): return self.rank == 'A' class Deck(object): def __init__(self): self.cards = [Card(suit, rank) for suit in SUITS for rank in RANKS] self.shuffle() def __str__(self): cards_in_deck = '' for card in self.cards: cards_in_deck = cards_in_deck + str(card) + ' ' return cards_in_deck def shuffle(self): random.shuffle(self.cards) def deal_card(self): card = self.cards.pop(0) return card class Hand(object): def __init__(self): self.hand = [] def add_card(self, card): self.hand.append(card) return self.hand def get_value(self): aces = 0 value = 0 for card in self.hand: if card.is_ace(): aces += 1 value += card.point while (value > 21) and aces: value -= 10 aces -= 1 return value class Dealer(Hand): def __init__(self, name, deck): Hand.__init__(self) self.name = name self.deck = deck self.isBust = False def show_hand(self): for card in self.hand: print card, print def hit(self): print "Hitting..." self.add_card(self.deck.deal_card()) return self.hand def stand(self): print "%s gets %d. Done." % (self.name, self.get_value()) def check_bust(self): if self.get_value() > 21: self.isBust = True print "%s gets bust!" % self.name else: self.stand() class Player(Dealer): def __init__(self, name, deck, bet): Dealer.__init__(self, name, deck) self.bet = bet self.isBust = False self.isSurrender = False self.isSplit = False self.split = [] def play(player, deck): print player.name + ':', player.show_hand() if player.name == 'Dealer': while player.get_value() < 17: player.hit() player.show_hand() player.check_bust() else: global chip_balance if chip_balance > player.bet and not player.isSplit: if player.hand[0].point == player.hand[1].point: choice = input_func("Hit, Stand, DoubleDown, Split or Surrender? (h/s/d/p/u) ", str.lower, range_=('h', 's', 'd', 'p', 'u')) else: choice = input_func("Hit, Stand, DoubleDown or Surrender? (h/s/d/u) ", str.lower, range_=('h', 's', 'd', 'u')) else: choice = input_func("Hit, Stand or Surrender? (h/s/u) ", str.lower, range_=('h', 's', 'u')) while choice == 'h': player.hit() player.show_hand() if player.get_value() > 21: player.isBust = True print "%s gets bust!" % player.name break choice = input_func("Hit or Stand? (h/s) ", str.lower, range_=('h', 's')) if choice == 's': player.stand() if choice == 'd': chip_balance -= player.bet player.bet *= 2 print "New balance = %d" % chip_balance player.hit() player.show_hand() player.check_bust() if choice == 'u': player.isSurrender = True chip_balance += (player.bet - player.bet / 2) print "New balance = %d" % chip_balance if choice == 'p': chip_balance -= player.bet print "New balance = %d" % chip_balance player.split.append(Player(' Split_1', deck, player.bet)) player.split.append(Player(' Split_2', deck, player.bet)) for p in player.split: p.add_card(player.hand.pop(0)) p.add_card(deck.deal_card()) p.isSplit = True play(p, deck) def input_func(prompt, type_=None, min_=None, max_=None, range_=None): value = '' while True: value = raw_input(prompt) if type_ is not None: try: value = type_(value) except ValueError: print "Sorry I don't understand." continue if min_ is not None and value max_: print "Sorry your input can not be more than %d!" % max_ elif range_ is not None and value not in range_: print "You must select from", range_ else: break return value def report(player, dealer): global chip_balance if player.isSurrender: tag = 'surrender' elif player.isBust: tag = 'lose' elif len(player.hand) == 2 and player.get_value() == 21 and not player.isSplit: tag = 'blackjack' chip_balance += player.bet * 3 elif dealer.isBust or (player.get_value() > dealer.get_value()): tag = 'win' chip_balance += player.bet * 2 elif player.get_value() == dealer.get_value(): tag = 'push' chip_balance += player.bet else: tag = 'lose' print "%s: %-*s Balance = %d" % (player.name, 10, tag, chip_balance) def game(): players = [] global chip_balance deck = Deck() player_num = input_func(" Please enter the number of players: (1-8) ", int, 1, MAX_PLAYERS) print " Let's get started... " for i in range(player_num): if chip_balance > 0: player_name = 'Player_' + str(i + 1) print "%s:" % player_name player_bet = input_func("Please bet. The minimal bet is 1 chip. ", int, 1, chip_balance) chip_balance -= player_bet print "Balance updated. New balance is %d." % chip_balance player = Player(player_name, deck, player_bet) players.append(player) else: print " The actual number of player is %d. There's no balance to support more players." % (len(players)) break dealer = Dealer('Dealer', deck) for i in range(2): for player in (players + [dealer]): player.add_card(deck.deal_card()) dealer.hand[1].hide_card() print " Dealer:" dealer.show_hand() print dealer.hand[1].reveal_card() for player in (players + [dealer]): play(player, deck) print print "...Final result... " for player in players: if not player.split: report(player, dealer) else: print "%s: split" % player.name for p in player.split: report(p, dealer) print " Final chip balance is %d. " % chip_balance if __name__ == '__main__': chip_balance = input_func(" Welcome to BlackJack! Please enter the chip balance: (1-1000) ", int, 1, MAX_BALANCE) while True: game() if chip_balance < 1: print "You don't have enough balance to proceed. Game over." break proceed = input_func("Do you want to continue? (y/n) ", str.lower, range_=('y', 'n')) if proceed == 'n': print " Thank you for playing! See you next time." break;

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