SINGLE-DIMENSIONAL ARRAYS - Introduction to Java Programming - page 235

0 Ace

1 2

0 Spades

.

1 Hearts

cardNumber / 13 = cardNumber % 13 =

.

2 Diamonds

10 Jack

3 Clubs

11 Queen

12 King

F IGURE 6.4

How cardNumber identifies a card's suit and rank number.

Listing 6.2 gives the solution to the problem.

L ISTING 6.2 DeckOfCards.java
1 public class DeckOfCards {
2 public static void main(String[] args) {
3 int [] deck = new int [ 52 ];
4 String[] suits = { "Spades" , "Hearts" , "Diamonds" , "Clubs" };
5 String[] ranks = { "Ace" , "2" , "3" , "4" , "5" , "6" , "7" , "8" , "9" ,
6

create array deck
array of strings
array of strings

"10" , "Jack" , "Queen" , "King" };

7
8 // Initialize the cards
9 for ( int i = 0 ; i < deck.length; i++)
10 deck[i] = i;
11
12 // Shuffle the cards
13 for ( int i = 0 ; i < deck.length; i++) {
14 // Generate an index randomly
15 int index = ( int )(Math.random() * deck.length);
16 int temp = deck[i];
17 deck[i] = deck[index];
18 deck[index] = temp;
19 }
20
21 // Display the first four cards
22 for ( int i = 0 ; i < 4 ; i++) {
23 String suit = suits[deck[i] / 13 ];
24 String rank = ranks[deck[i] % 13 ];
25 System.out.println( "Card number " + deck[i] + ": "
26 + rank + " of " + suit);
27 }
28 }
29 }

initialize deck

shuffle deck

suit of a card
rank of a card

Card number 6: 7 of Spades
Card number 48: 10 of Clubs
Card number 11: Queen of Spades
Card number 24: Queen of Hearts