关于对list进行排序

按照某个字段对list倒序排列：

 

     

      Comparator comp = new Comparator() {public int compare(Object o1, Object o2) {Attendance a1 = (Attendance) o1;Attendance a2 = (Attendance) o2;if (a1.getAdd_username().compareTo(a2.getAdd_username())<0)return 0;elsereturn 1;}};Collections.sort(travellist, comp);