Java 创建和使用Card类和Deck类

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 * 时代Java公众号 - N o w J a  v a . c o m 提 供 

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import java.util.*;

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public class DisplayDeck {

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    public static void main(String[] args) {

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        Deck deck = new Deck();

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        for (int suit = Card.DIAMONDS; suit <= Card.SPADES; suit++) {

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            for (int rank = Card.ACE; rank <= Card.KING; rank++) {

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                Card card = deck.getCard(suit, rank);

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                System.out.format("%s of %s%n",

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                        card.rankToString(card.getRank()),

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                        card.suitToString(card.getSuit()));

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            }

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        }

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    }/**nowjava.com - 时代Java**/

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}

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class Deck {

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    public static int numSuits = 4;

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    public static int numRanks = 13;

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    public static int numCards = numSuits * numRanks;

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    private Card[][] cards;

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    public Deck() {

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        cards = new Card[numSuits][numRanks];

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        for (int suit = Card.DIAMONDS; suit <= Card.SPADES; suit++) {

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            for (int rank = Card.ACE; rank <= Card.KING; rank++) {

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                cards[suit - 1][rank - 1] = new Card(rank, suit);

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            }

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        }

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    }

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    public Card getCard(int suit, int rank) {

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        return cards[suit - 1][rank - 1];

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    }

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}

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class Card {

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    private final int rank;

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    private final int suit;

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    // Kinds of suits

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    public final static int DIAMONDS = 1;

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    public final static int CLUBS = 2;

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    public final static int HEARTS = 3;

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    public final static int SPADES = 4;

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    // Kinds of ranks

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    public final static int ACE = 1;

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    public final static int DEUCE = 2;

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    public final static int THREE = 3;

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    public final static int FOUR = 4;

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    public final static int FIVE = 5;

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    public final static int SIX = 6;

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    public final static int SEVEN = 7;

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    public final static int EIGHT = 8;

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    public final static int NINE = 9;

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    public final static int TEN = 10;

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    public final static int JACK = 11;

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    public final static int QUEEN = 12;

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    public final static int KING = 13;

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    public Card(int rank, int suit) {

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        assert isValidRank(rank);

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        assert isValidSuit(suit);

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        this.rank = rank;

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        this.suit = suit;

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    }

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    public int getSuit() {

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        return suit;

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    }

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    public int getRank() {

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        return rank;

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    }

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    public static boolean isValidRank(int rank) {

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        return ACE <= rank && rank <= KING;

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    }

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    public static boolean isValidSuit(int suit) {

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        return DIAMONDS <= suit && suit <= SPADES;

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    }

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    public static String rankToString(int rank) {

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        switch (rank) {

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        case ACE:

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            return "Ace";

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        case DEUCE:

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            return "Deuce";

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        case THREE:

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            return "Three";

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        case FOUR:

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            return "Four";

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        case FIVE:

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            return "Five";

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        case SIX:

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            return "Six";

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        case SEVEN:

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            return "Seven";

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        case EIGHT:

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            return "Eight";

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        case NINE:

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            return "Nine";

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        case TEN:

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            return "Ten";

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        case JACK:

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            return "Jack";

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        case QUEEN:

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            return "Queen";

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        case KING:

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            return "King";

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        default:

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            //Handle an illegal argument.  There are generally two

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            //ways to handle invalid arguments, throwing an exception

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            //(see the section on Handling Exceptions) or return null

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            return null;

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        }

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    }

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    public static String suitToString(int suit) {

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        switch (suit) {

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        case DIAMONDS:

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            return "Diamonds";

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        case CLUBS:

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            return "Clubs";

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        case HEARTS:

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            return "Hearts";

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        case SPADES:

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            return "Spades";

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        default:

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            return null;

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        }

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    }

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    public static void main(String[] args) {

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        // must run program with -ea flag (java -ea ..) to

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        // use assert statements

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        assert rankToString(ACE) == "Ace";

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        assert rankToString(DEUCE) == "Deuce";

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        assert rankToString(THREE) == "Three";

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        assert rankToString(FOUR) == "Four";

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        assert rankToString(FIVE) == "Five";

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        assert rankToString(SIX) == "Six";

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        assert rankToString(SEVEN) == "Seven";

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        assert rankToString(EIGHT) == "Eight";

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        assert rankToString(NINE) == "Nine";

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        assert rankToString(TEN) == "Ten";

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        assert rankToString(JACK) == "Jack";

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        assert rankToString(QUEEN) == "Queen";

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        assert rankToString(KING) == "King";

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        assert suitToString(DIAMONDS) == "Diamonds";

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        assert suitToString(CLUBS) == "Clubs";

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        assert suitToString(HEARTS) == "Hearts";

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        assert suitToString(SPADES) == "Spades";

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    }

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}

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/*

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 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.

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 *

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 * Redistribution and use in source and binary forms, with or without

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 * modification, are permitted provided that the following conditions

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 * are met:

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 *

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 *   - Redistributions of source code must retain the above copyright

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 *     notice, this list of conditions and the following disclaimer.

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 *

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 *   - Redistributions in binary form must reproduce the above copyright

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 *     notice, this list of conditions and the following disclaimer in the

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 *     documentation and/or other materials provided with the distribution.

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 *

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