Get the starting and ending dates for a week

private static final SimpleDateFormat format_date = new SimpleDateFormat (
Confighomehelper.getvaluebyconfig ("Format.date"));

/**
  * Calculates the start date of a week for a year
  *
  * @param yearnum
  *             format yyyy
  * @param weekNum
  *             1 to 52 or
  * @return date in YYYY-MM-DD
  */
 public static String getyearweekfirstday (int yearno, int weekno) {
  calendar cal = Calendar.getinstance ();
 & Nbsp;cal.setfirstdayofweek (Calendar.sunday); Set the first day of the week for the Monday
  cal.set (Calendar.day_of_week, calendar.sunday);//weekly starting from Monday
  // The above two lines of code can be implemented, the first week of each year, is the week that contains the first Monday.
  cal.setminimaldaysinfirstweek (7);//Set minimum 7 days per week
  cal.set (calendar.year, Yearno);
  cal.set (Calendar.week_of_year, Weekno);
  //The year, month, day
  return Format_date.format (Cal.gettime ()) of the current date respectively;
 }

 /**
  * Calculates the end date of a week for a year
  *
  * @param yearnum
  *             format yyyy
  * @param weekNum
  *             1 to 52 or
  * @return date in YYYY-MM-DD
  */
 public static String getyearweekendday (int yearno, int weekno) {
  calendar cal = Calendar.getinstance ();
&nbs P; cal.setfirstdayofweek (Calendar.sunday); Set the first day of the week for Monday
  cal.set (calendar.day_of_week,calendar.saturday);//weekly from Monday
  // The above two lines of code can be implemented, the first week of each year, is the week that contains the first Monday.
  cal.setminimaldaysinfirstweek (7);//Set minimum 7 days per week
  cal.set (calendar.year, Yearno);
  cal.set (Calendar.week_of_year, Weekno);
  return Format_date.format (Cal.gettime ());
 }