1 reply to this topic

[webdreamer]

I understand the enumerations code as taught for java 1.5.0. However I don't understand exactly where we ought to put them, I mean:confused:: are they like classes? public enum Whatever{}? but do we need to write them INSIDE other classes? Or can we just aggregate them or something?

[Ryan Marfone]

An example of using enum:

public class Card {

    public enum Rank { DEUCE, THREE, FOUR, FIVE, SIX,

        SEVEN, EIGHT, NINE, TEN, JACK, QUEEN, KING, ACE }


    public enum Suit { CLUBS, DIAMONDS, HEARTS, SPADES }


    private final Rank rank;

    private final Suit suit;

    private Card(Rank rank, Suit suit) {

        this.rank = rank;

        this.suit = suit;

    }


    public Rank rank() { return rank; }

    public Suit suit() { return suit; }

    public String toString() { return rank + " of " + suit; }


    private static final List<Card> protoDeck = new ArrayList<Card>();


    // Initialize prototype deck

    static {

        for (Suit suit : Suit.values())

            for (Rank rank : Rank.values())

                protoDeck.add(new Card(rank, suit));

    }


    public static ArrayList<Card> newDeck() {

        return new ArrayList<Card>(protoDeck); // Return copy of prototype deck

    }

}