import java.util.Collection;import java.util.Collections;public class Card {private String face; // A, K, Q, J, 10, ... 2private String suit; // Spade, Heart, Club, Diamondpublic Card(String suit, String face) {this.face = face;this.suit = suit;}protected String getFace() {return face;}protected String getSuit() {return suit;}public String toString() {return suit + " " + face;}public static void shuffle(Card[] deck, int startIndex, int size,int splitIndex) {if (splitIndex * 2 > size) {Card.swap(deck, startIndex, splitIndex, size - splitIndex);shuffle(deck, size - splitIndex, splitIndex, size - splitIndex);} else if (splitIndex * 2 < size) {Card.swap(deck, startIndex, size - splitIndex, splitIndex);shuffle(deck, startIndex, size - splitIndex, splitIndex);} else {Card.swap(deck, startIndex, splitIndex, splitIndex);}}public static void swap(Card[] deck, int srcIndex, int dstIndex, int size) {String face = "";String suit = "";for (int i = 0; i < size; i++) {face = deck[srcIndex + i].face;suit = deck[srcIndex + i].suit;deck[srcIndex + i].face = deck[dstIndex + i].face;deck[srcIndex + i].suit = deck[dstIndex + i].suit;deck[dstIndex + i].face = face;deck[dstIndex + i].suit = suit;}}/** * @param args */public static void main(String[] args) {Card[] deck = new Card[52];String f[] = { "A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J","Q", "K" };String s[] = { "Spade", "Heart", "Club", "Diamond" };for (int i = 0; i < s.length; i++) {for (int j = 0; j < f.length; j++) {deck[i * 13 + j] = new Card(s[i], f[j]);}}int rnd = 0;int numOfShuffle = 10;for (int i = 0; i < numOfShuffle; i++) {rnd = (int) Math.abs(Math.random() * 52);Card.shuffle(deck, 0, deck.length, rnd);}// Testfor (int i = 0; i < deck.length; i++) {System.out.println(deck[i]);}}}
