// 根据学界获取年级名称
 private String getGrade(int y) {
   Date now = new Date();
   int pastHalf = isPastHalf(now) ? 1 : 0;
   int currentYear = DateUtil.getYear(now);
   int year = currentYear + pastHalf - y;
   return NumberUtil.getSimpleNumber(year) + "年级";
 }
 // 根据年份获取年级号
 private int getGradeNum(int year) {
   Date now = new Date();
   int pastHalf = isPastHalf(now) ? 1 : 0;
   int currentYear = DateUtil.getYear(now);
   return currentYear + pastHalf - year;
 }