Program z kursu Javy od Oracle - błąd

Question

Piszę program z kursu Javy od Oracle i wyskakuje mi błąd:
Cannot make a static reference to the non-static method getCard(int, int) from the type Deck

Projekt zawiera 3 pliki/klasy:

klasa Card:

public class Card {
	
	private int rank;
	private int suit;
	
	// Kinds of suits
    public final static int DIAMONDS = 1;
    public final static int CLUBS    = 2;
    public final static int HEARTS   = 3;
    public final static int SPADES   = 4;

    // Kinds of ranks
    public final static int ACE   = 1;
    public final static int DEUCE = 2;
    public final static int THREE = 3;
    public final static int FOUR  = 4;
    public final static int FIVE  = 5;
    public final static int SIX   = 6;
    public final static int SEVEN = 7;
    public final static int EIGHT = 8;
    public final static int NINE  = 9;
    public final static int TEN   = 10;
    public final static int JACK  = 11;
    public final static int QUEEN = 12;
    public final static int KING  = 13;
    
    public Card(int rank, int suit) {
    	this.suit = suit;
    	this.rank = rank;
    }
	
	public int getSuit() {
		return suit;
	}
	
	public int getRank() {
		return rank;
	}
	
	public static String rankToString(int rank) {
        switch (rank) {
        case ACE:
            return "Ace";
        case DEUCE:
            return "Deuce";
        case THREE:
            return "Three";
        case FOUR:
            return "Four";
        case FIVE:
            return "Five";
        case SIX:
            return "Six";
        case SEVEN:
            return "Seven";
        case EIGHT:
            return "Eight";
        case NINE:
            return "Nine";
        case TEN:
            return "Ten";
        case JACK:
            return "Jack";
        case QUEEN:
            return "Queen";
        case KING:
            return "King";
        default:
            return null;
        }    
    }
	
	public static String suitToString(int suit) {
        switch (suit) {
        case DIAMONDS:
            return "Diamonds";
        case CLUBS:
            return "Clubs";
        case HEARTS:
            return "Hearts";
        case SPADES:
            return "Spades";
        default:
            return null;
        }    
    }

}

Klasa Deck:

public class Deck {
	public static int numSuits = 4;
	public static int numRanks = 13;
	public static int numCards = numSuits * numRanks;
	
	private Card[][] cards;
	
	public Deck() {
	cards = new Card[numSuits][numRanks];
	
	for(int suit = Card.DIAMONDS; suit <= Card.SPADES; suit++ ) {
		for(int rank = Card.ACE; rank <= Card.KING; rank++)
			cards[suit-1][rank-1] = new Card(suit,rank);
	}
	}
	
	public Card getCard(int suit, int rank) {
		return cards[suit-1][rank-1];
	}
}

Klasa DisplayDeck:

class DisplayDeck {
	public static void main(String[] args) {
		for(int suit = Card.DIAMONDS; suit <= Card.SPADES; suit++) {
			for(int rank = Card.ACE; rank <= Card.KING; rank++) {
				Card card = Deck.getCard(suit,rank);
			}
				
		}
	}
}

Bład ukazuje sie w klasie DisplayDeck w momencie:

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

Tutaj link do zadania z kursu: http://docs.oracle.com/javase/tutorial/java/javaOO/QandE/creating-questions.html

Answer 1

getCard() nie jest metodą statyczną a odwołujesz się do niej tak jakby była. Utwórz obiekt klasy Deck i na jego rzecz wywołaj tą metodę

Comments

A jak sie odwołac do niej w inny sposob ?

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Card card = new Deck().getCard(suit,rank);