java编写扑克的洗牌程序

package com.web;
2
3public class Card {
4
5private String face; // A, K, Q, J, 10, 2
6 private String suit; // Spade, Heart, Club, Diamond
7
8public 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) {
14this.face = face;
15this.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){
20this.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
24protected String getFace() {
25return face;
26 }
27
28protected String getSuit() {
29return suit;
30 }
31
32public String toString() {
33return suit + " " + face;
34 }
35
36public static void shuffle(Card[] deck, int startIndex, int size, int splitIndex) {
37if (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
49public static void swap(Card[] deck, int srcIndex, int dstIndex, int size) {
50 String face = "";
51 String suit = "";
52for (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
62public 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" };
67for (int i = 0; i < s.length; i++) {
68for (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 }
74int rnd = 0;
75int numOfShuffle = 10;
76for (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}