I have a question about the Java public method

class Deck  {
final int CARD_NUM = 52; // Number of cards
CardcardArr[] = newCard[CARD_NUM]; // Include an array of Card objects

Deck () { // Initialize Deck's card.
    int i=0;

    for(int k=Card.KIND_MAX; k > 0; k--)
        for(int n=0; n < Card.NUM_MAX ; n++)
            cardArr[i++] = new Card(k, n+1);
}

Cardpick(intindex) { // Pull one card from the specified location (index) and return it
    return cardArr[index];
}

Select one card from Cardpick() { // Deck.
    int index = (int)(Math.random() * CARD_NUM);
    return pick(index);
}

Void shuffle() { // Mix the order of the cards.
    for(int i=0; i < cardArr.length; i++) {
        int r = (int)(Math.random() * CARD_NUM);

        Card temp = cardArr[i]; 
        cardArr[i] = cardArr[r];
        cardArr[r] = temp;
        }
    }
} // End of Deck Class

// Card Class
class Card {
Static final int KIND_MAX = 4; // Number of card patterns
Static final int NUM_MAX = 13; // Number of cards by pattern

static final int SPADE   = 4;
static final int DIAMOND = 3;
static final int HEART   = 2;
static final int CLOVER  = 1;

int kind;
int number;

Card() {
    this(SPADE, 1);
}

Card(int kind, int number) {
    this.kind = kind;
    this.number = number;
}

public String toString() {
    String[] kinds = {"", "CLOVER", "HEART", "DIAMOND", "SPADE"};
    String numbers = "0123456789XJQK"; // Number 10 expressed as X

    return "kind : " + kinds[this.kind] 
        + + ", number : " + numbers.charAt(this.number);
    } // End of toString()
} // End of Card Class

public class Tv {   
    public static void main(String args[]) {
        Deck d = new Deck(); // Create a deck of cards (Deck).
        Card c = d.Pick(0); // Pull out the top card before mixing.
        System.out.println(c); // System.out.println(c.toString());

        d.Shuffle(); // Mix the cards.
        c = d.After mixing pick(0); //, pull out the top card.
        System.out.println(c.toString());

    }

}