JAVA获取日期月内所有日期

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public List<String> getMonthDay(String date) {
        List<String> list = getMonthFullDay(date);
        List<String> listDay = new ArrayList<>();
        for (String date1 : list) {
            listDay.add(date1.substring(8, 10));
        }
        return listDay;
    }

 public List<String> getMonthFullDay(String date) {
        List<String> fullDayList = new ArrayList<String>();
        int year = Integer.parseInt(date.substring(0, 4));
        int month = Integer.parseInt(date.substring(5, 7));
        int day = 1;// 所有月份从1号开始
        Calendar cal = Calendar.getInstance();// 获得当前日期对象
        cal.clear();// 清除信息
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month - 1);// 1月从0开始
        cal.set(Calendar.DAY_OF_MONTH, day);
        int count = cal.getActualMaximum(Calendar.DAY_OF_MONTH);
        for (int j = 0; j <= (count - 1); ) {
            if (sdf.format(cal.getTime()).equals(getLastDay(year, month)))
                break;
            cal.add(Calendar.DAY_OF_MONTH, j == 0 ? +0 : +1);
            j++;
            fullDayList.add(sdf.format(cal.getTime()));
        }
        return fullDayList;
    }

 public String getLastDay(int year, int month) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.MONTH, month);
        cal.set(Calendar.DAY_OF_MONTH, 0);
        return sdf.format(cal.getTime());
    }