java编写扑克的洗牌程序

package com.web;
2
3 public class Card {
4
5 private String face; // A, K, Q, J, 10, 2
6 private String suit; // Spade, Heart, Club, Diamond
7
8 public Card() {
9
10 }
11
12 // 定义一个构造函数用于初始化点数2~A的牌
13 public Card(String suit, String face) {
14 this .face = face;
15 this .suit = suit;
16 }
17
18 // 定义一个构造函数用于初始化大王和小王
19 public Card(String suit) {
20 this .face = "" ; // 如果不给face赋值的话，洗牌和切牌后的大小王前面会显示“null”
21 this .suit = suit;
22 }
23
24 protected String getFace() {
25 return face;
26 }
27
28 protected String getSuit() {
29 return suit;
30 }
31
32 public String toString() {
33 return suit + " " + face;
34 }
35
36 public static void shuffle(Card[] deck, int startIndex, int size, int splitIndex) {
37 if (splitIndex * 2 > size) {
38 Card.swap(deck, startIndex, splitIndex, size - splitIndex);
39 shuffle(deck, size - splitIndex, splitIndex, size - splitIndex);
40 } else if (splitIndex * 2 < size) {
41 Card.swap(deck, startIndex, size - splitIndex, splitIndex);
42 shuffle(deck, startIndex, size - splitIndex, splitIndex);
43 } else {
44 Card.swap(deck, startIndex, splitIndex, splitIndex);
45 }
46
47 }
48
49 public static void swap(Card[] deck, int srcIndex, int dstIndex, int size) {
50 String face = "" ;
51 String suit = "" ;
52 for ( int i = 0 ; i < size; i ++ ) {
53 face = deck[srcIndex + i].face;
54 suit = deck[srcIndex + i].suit;
55 deck[srcIndex + i].face = deck[dstIndex + i].face;
56 deck[srcIndex + i].suit = deck[dstIndex + i].suit;
57 deck[dstIndex + i].face = face;
58 deck[dstIndex + i].suit = suit;
59 }
60 }
61
62 public static void main(String[] args) {
63 Card[] deck = new Card[ 54 ];
64 String f[] = { " A " , " 2 " , " 3 " , " 4 " , " 5 " , " 6 " , " 7 " , " 8 " , " 9 " , " 10 " , " J " , " Q " , " K " } ;
65 // String s[] = {"Spade","Heart","Club","Diamond"};
66 String s[] = { " 黑桃 " , " 红桃 " , " 梅花 " , " 方块 " } ;
67 for ( int i = 0 ; i < s.length; i ++ ) {
68 for ( int j = 0 ; j < f.length; j ++ ) {
69 deck[i * 13 + j] = new Card(s[i], f[j]);
70 }
71 deck[ 52 ] = new Card( " 小王 " );
72 deck[ 53 ] = new Card( " 大王 " );
73 }
74 int rnd = 0 ;
75 int numOfShuffle = 10 ;
76 for ( int i = 0 ; i < numOfShuffle; i ++ ) {
77 rnd = ( int ) Math.abs(Math.random() * 52 );
78 Card.shuffle(deck, 0 , deck.length, rnd);
79 }
80 // Test
81 for ( int i = 0 ; i < deck.length; i ++ ) {
82 System.out.println(deck[i]);
83 }
84 }
85 }