球队分组

public class countryGroup {
    public static void main(String[] args) {
        Map<Integer,List<String>> Integer2Countrys = new HashMap<Integer,List<String>>();
        List<String> ListCountry = new ArrayList<String>();
        String country = "科特迪瓦，阿根廷，澳大利亚，塞尔维亚，荷兰，尼日利亚，日本，美国，中国，" +
                "新西兰，巴西，比利时，韩国，喀麦隆，洪都拉斯，意大利";
        String[] countrys = country.split("，");
        for (String string:countrys){
            ListCountry.add(string);
        }
        for (int j = 0;j < 4;j++){
            List<String> listcountrygroup = new ArrayList<String>();
            for (int i = 0;i < 4;i++){
                Random random = new Random();
                int index = random.nextInt(ListCountry.size());
                listcountrygroup.add(ListCountry.get(index));
                ListCountry.remove(index);
            }
            Integer2Countrys.put(j+1,listcountrygroup);
        }
        for (Integer in : Integer2Countrys.keySet()){
            System.out.println("第"+in+"组");
            for (String str :Integer2Countrys.get(in)){
                System.out.print(str+"  ");
            }
            System.out.println();
        }
    }
}