java-获取给定月份的每周的开始日期和结束日期

我得到以下代码的答案

List<List<String>> getNumberOfWeeks(int year, int month) {        SimpleDateFormat format = new SimpleDateFormat("dd-MM-yyyy");        List<List<String>> weekdates = new ArrayList<List<String>>();        List<String> dates;        Calendar c = Calendar.getInstance();        c.set(Calendar.YEAR, year);        c.set(Calendar.MONTH, month);        c.set(Calendar.DAY_OF_MONTH, 1);        while (c.get(Calendar.MONTH) == month) {     dates = new ArrayList<String>();   while (c.get(Calendar.DAY_OF_WEEK) != Calendar.MONDAY) {     c.add(Calendar.DAY_OF_MONTH, -1);   }   dates.add(format.format(c.getTime()));   c.add(Calendar.DAY_OF_MONTH, 6);   dates.add(format.format(c.getTime()));   weekdates.add(dates);   c.add(Calendar.DAY_OF_MONTH, 1);        }        System.out.println(weekdates);        return weekdates;      }