1 import java.util.LinkedList;
2 import java.util.Random;
3
4 //自定义一个Poker类，用于存储扑克的信息（花色、数字）
5 class Poker{
6 String color;
7 String numbers;
8
9 public Poker(String color, String numbers) {
10 this.color = color;
11 this.numbers = numbers;
12 }
13
14 //重写toString方法
15 @Override
16 public String toString() {
17 return color + numbers;
18 }
19
20 }
21
22
23 public class Demo3 {
24 public static void main(String[] args) {
25 LinkedList pokers = CreatePoker();
26 shufflePoker(pokers);
27 showPoker(pokers);
28 }
29
30 //生成一副扑克牌
31 public static LinkedList CreatePoker(){
32 LinkedList list = new LinkedList();
33 String[] color = {"红桃","黑桃","梅花","方块"};
34 String[] numbers = {"A","2","3","4","5","6","7","8","9","10","J","Q","K"};
35 for (int i = 0; i < numbers.length; i++) {
36 for (int j = 0; j < color.length; j++) {
37 list.add(new Poker(color[j], numbers[i]));
38 }
39 }
40 return list;
41 }
42
43 //将扑克牌信息打印
44 public static void showPoker(LinkedList pokers){
45 for (int i = 0; i < pokers.size(); i++) {
46 System.out.print(pokers.get(i) + " ");
47 //为什么等于9？因为等于0的话，i为0时，直接换行打印。等于9是0 ~ 9，就是每十张牌变换行一次
48 if(i % 10 == 9){
49 System.out.println();
50 }
51 }
52 }
53
54 //洗牌
55 public static void shufflePoker(LinkedList pokers){
56 Random random = new Random();
57 for (int i = 0; i < 100; i++) { //i < 10也行，只不过原则上越大，牌洗得越乱
58 int index1 = random.nextInt(pokers.size());
59 int index2 = random.nextInt(pokers.size());
60 Poker poker1 = (Poker) pokers.get(index1);
61 Poker poker2 = (Poker) pokers.get(index2);
62 pokers.set(index1, poker2);
63 pokers.set(index2, poker1);
64 }
65 }
66 }
