PlayingCards.java

import java.util.Scanner; // for user input

public class PlayingCards {

    /**
    *   Program:    PlayingCards.java (formerly TestCards.java)
    *   Purpose:    Playing card program
    *   Creator:    Chris Clarke
    *   Created:    28.01.2013
    */

    public static void main(String[] args) {

        final int CARDS_IN_PACK = 52;

        Card example = new Card("2", "Clubs"); // example of constructor

        Card[] c = new Card[CARDS_IN_PACK]; // array of 52 Cards
        int[] cardArray = new int[CARDS_IN_PACK];

        int count=0;
        int p, i;
        int s, r;
        int card=0;
        String in;
        int players;
        int strongest;

        // set up array with values 0 to CARDS_IN_PACK-1 inclusive
        for (i=0; i<cardArray.length; i++) {
            cardArray[i] = i;
        }

        for (s=0; s<4; s++) {       // suit
            for (r=0; r<13; r++) {  // rank
                c[count] = new Card(example.ranks[r], example.suits[s]);
                //System.out.println(c[count].toString());
                count++;
            }//end for r
        }//end for s

        System.out.println("Shuffling deck...");
        // create shuffled pack
        cardArray = randomizeOrder(CARDS_IN_PACK, cardArray);
        System.out.println("Deck shuffled.");

        //create Scanner object
        Scanner scan = new Scanner(System.in);

        do {
            System.out.print("How many players? Must be between 2 & 10: ");
            players = scan.nextInt();
        } while (players < 2 || players > 10);

        // create test array to find strongest card per deal
        Card[] test = new Card[players];

        do {
            System.out.print("Deal? (y/n) ");
            in = scan.next().toLowerCase();
            if (!in.startsWith("n")) {
                // deal a round of cards, 1 to each player
                for (p=0; p<players; p++) {
                    test[p] = c[cardArray[card]];
                    System.out.print(c[cardArray[card]].toString()+"\t");
                    if (card < CARDS_IN_PACK-1) {
                        card++;
                    } else {
                        break;
                    }//end if card
                }//end for p

                strongest = 0;

                // break if deal was incomplete
                if (p<players-1) break;

                // find strongest card
                for (i=1; i<players; i++) {
                    if (i != strongest) {
                        if (test[i].stronger(test[strongest])) {
                            strongest = i;
                        }//end if test[i]
                    }//end if i
                }//end for

                System.out.println("Winner: "+test[strongest].toString());

            }// end if in
        } while (!in.startsWith("n"));
    }//end main

    public static int getRandomNumber(int minimum, int maximum) {
    // get a random number between minimum and maximum-1 (minimum <= r < maximum)

        return (int) (minimum+( maximum-minimum) * Math.random());

    }//end getRandomNumber

    public static int[] randomizeOrder(int n, int[] theArray) {
    // re-arrange array into random order
        /**
        *   n is the number of numbers to choose, usually n = theArray.length;
        */

        int r;
        int max = theArray.length;
        int[] results = new int[n];

        // pick n numbers
        for (int i=0; i<n; i++) {
            // range 1 to 49, 1 to 48 etc
            r = getRandomNumber(0, (max-i));
            // store results
            results[i] = theArray[r];
            // move last number in theArray to position r
            theArray[r] = theArray[max-1-i];
        }//end for

        return results;

    }//end randomizeOrder
}//end class

class Card {

    /**
    *   Class:      Card.java
    *   Purpose:    Playing card (for Yahoo! Answers)
    *   Creator:    Chris Clarke
    *   Created:    28.01.2013
    */

    public Card (String r, String s) { // constructor
        rank = r;
        suit = s;
    }

    public int getRankNumber(String r) {
        for (int i=0; i<ranks.length; i++) {
            if (r.equalsIgnoreCase(ranks[i])) return i;
        }
        return -1;
    }//end getRankNumber

    public int getSuitNumber(String s) {
        for (int i=0; i<suits.length; i++) {
            if (s.equalsIgnoreCase(suits[i])) return i;
        }
        return -1;
    }//end getSuitNumber

    public boolean isOfSuit(String s) {
    // checks if card is of given suit
        if (suit.equalsIgnoreCase(s)) {
            return true;
        }
        return false;
    }//end isOfSuit

    public boolean stronger(Card c) {
    // is current card is stronger than Card c?

        if (this.getRankNumber(rank) == -1 || this.getSuitNumber(suit) == -1
         || c.getRankNumber(c.rank) == -1 || c.getSuitNumber(c.suit) == -1) {
            System.out.println("Card error!");
            System.exit(0);
        }

        if (this.getRankNumber(rank) > c.getRankNumber(c.rank)) {
            return true;
        } else if (this.getRankNumber(rank) == c.getRankNumber(c.rank)) {
            if (this.getSuitNumber(suit) > c.getSuitNumber(c.suit)) {
                return true;
            }

            if (this.getSuitNumber(suit) == c.getSuitNumber(c.suit)) {
                System.out.println("Duplicate card error!");
                System.exit(0);
            }
        }//end if/else
        return false;
    }//end stronger

    public String toString() {  // returns a printed representation
                    // in the form "8S", "10D", "KC",...
        String printed = rank;
        printed += suit.charAt(0);
        return printed;
    }//end toString

    private String rank = "";
    private String suit = "";

    // ranks are in order
    public String[] ranks = {"2", "3", "4", "5", "6", "7", "8", "9", "10",
     "J", "Q", "K", "A"};

    // suits are in order: Spades beat Hearts beat Diamonds beat Clubs
    public String[] suits = {"Clubs", "Diamonds", "Hearts", "Spades"};
}//end class