用java得到接下来14天的每一天分别为周几

public static void main(String[] args) {
        List<String> nextDays = getNextDays(14);
        for (String string : nextDays) {
            System.out.println(string);
        }
    }

        private static List<String> getNextDays(int days) {
        String zhou = "日一二三四五六";
        Calendar instance = Calendar.getInstance();
        instance.setTime(new Date());
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        List<String> zhous = new ArrayList<>();
        for (int i =0;i<days;i++) {
            instance.add(Calendar.DATE, 1);
            int ind = instance.get(Calendar.DAY_OF_WEEK);
            zhous.add(sdf.format(instance.getTime())+"  星期"+zhou.substring(ind-1,ind));
        }
        return zhous;
    }