Card shuffling and dealing. - Java Object Oriented Design

Java examples for Object Oriented Design:Class

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Description

Card shuffling and dealing.

Demo Code

import java.security.SecureRandom;
public class Main
{
   // execute application
   public static void main(String[] args)
   {//w w  w.  j a  v a  2 s  .  c  o  m
      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 = 1; i <= 52; i++)
      {
         // deal and display a Card
         System.out.printf("%-19s", myDeckOfCards.dealCard());

     if (i % 4 == 0) // output a newline after every fourth card
        System.out.println();
      } 
   } 
}

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

   // two-argument constructor initializes card's face and suit
   public Card(String face, String suit)
   {
      this.face = face;
      this.suit = suit; 
   } 

   // return String representation of Card
   public String toString() 
   { 
      return face + " of " + suit;
   } 
}
class DeckOfCards
{
   private Card[] deck; // array of Card objects
   private int currentCard; // index of next Card to be dealt (0-51)
   private static final int NUMBER_OF_CARDS = 52; // constant # of Cards
   // random number generator
   private static final SecureRandom randomNumbers = new SecureRandom();

   // 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; // first Card dealt will be deck[0]

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

   public void shuffle()
   {
      currentCard = 0; 
      for (int first = 0; first < deck.length; first++) 
      {
         int second =  randomNumbers.nextInt(NUMBER_OF_CARDS);
         Card temp = deck[first];        
         deck[first] = deck[second];   
         deck[second] = temp;            
      } 
   } 
   public Card dealCard()
   {
      if (currentCard < deck.length)
         return deck[currentCard++]; // return current Card in array
      else        
         return null; 
   } 
}

Result


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