card.java

 
package blackjack;

class Card {

    public int number;//1 is ace, 2 is two, 13 is king
    public int suit;//1 is club, 2 is diamond, 3 is heart, 4 is spade

    public Card(int number, int suit) {//make a new card
        this.number = number;
        this.suit = suit;
    }

}

game.java

package blackjack;

import java.util.Scanner;
import java.util.*;
import java.util.concurrent.ThreadLocalRandom;

class Game {

    public static void main(String[] args) {

        ArrayList<Card> cards = new ArrayList<Card>();
        ArrayList<Card> player1 = new ArrayList<Card>();
        ArrayList<Card> player2 = new ArrayList<Card>();
      
        for (int i = 0; i < 13; i ++) {

            //loop through each number(0 is ace, 12 is king) and add a card of each suit to cards.
            //cards.put adds the element to the end of the array
            cards.add(new Card(i, 1));//club 
            cards.add(new Card(i, 2));//diamond
            cards.add(new Card(i, 3));//heart
            cards.add(new Card(i, 4));//spade

        }
        
        // more code here for the actual game...
        // at this point, the card[] should contain all 52 cards in a deck, in random order
        // To access the first element of card[], for example, you do card[0].number
        // to get the number, and card[0].suit to get the suit.
        // To get a word for the suit or number, you can create a static string array like 
        //["Clubs", "Diamonds", "Hearts", "Spades"] and get the nth element
        // of that array, where N is the number of the suit
    
        //EXAMPLE: shuffle the deck
          shuffleArray(cards);
      
        //EXAMPLE: to "deal" a card to a player:
          //first, add the card to the player's "hand"
          player1.add(cards.get(0));//cards.get(0) returns the zeroth element of the deck
          //then, remove the first card from the deck, because it is now in someone's hand.
          cards.remove(0);
      
        //EXAMPLE: get the word for the suit and number of the first element of the array, and print it
          String[] suits = {"Clubs", "Diamonds", "Hearts", "Spades"};
          String[] numbers = {"Ace", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten", "Jack", "Queen", "King"};
          //get the number first
          String number = numbers[cards.get(0).number];
          //then the suit
          String suit = suits[cards.get(0).suit - 1];
          //now print it
          System.out.println("Your card is the " + number + " of " + suit + ".");
          
    }
    
    public static void shuffleArray(ArrayList<Card> array) {
        Random random = ThreadLocalRandom.current();
        for (int i = array.size() - 1; i > 0; i--) {
            int index = random.nextInt(i + 1);
            // Simple swap
            Collections.swap(array, index, i);
            

        }

    }


}