字符串转换日期，星期

public static String getWeekOfDate(String date) throws ParseException  { 
  SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
  //sf.format(date);//日期转字符串
  Date d = sf.parse(date);//字符串转日期
  String week = "";
  switch (d.getDay()) { //星期
  case 0:
   week = "星期日";
  break;
  case 1:
   week = "星期一";
  break;
  case 2:
   week = "星期二";
  break;
  case 3:
   week = "星期三";
  break;
  case 4:
   week = "星期四";
  break;
  case 5:
   week = "星期五";
  break;
  case 6:
   week = "星期六";
  break;
  }
  return week;
 }