public class Demo2 {
    public static void main(String[] args) {
        //创建HashMap集合，key是编号，value是扑克牌
        HashMap<Integer, String> hm = new HashMap<>();
        //创建ArrayList集合存储编号
        ArrayList<Integer> arr = new ArrayList<>();
        //创建花色数组
        String[] color = {"♥", "♠", "♦", "♣"};
        //创建数字数组
        String[] number = {"3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "k", "A", "2",};
        int index = 0;//定义一个下标
        for (String num : number) {
            for (String col : color) {
                //添加到HashMap集合中
                hm.put(index, num + col);
                //编号添加到ArrayList集合中
                arr.add(index);
                index++;
            }
        }
        hm.put(index, "大