对List里面所有对象排序

//sort对list里面对象排序
private static void sort(List<AbstractEntity> data) {

Collections.sort(data, new Comparator<AbstractEntity>() {

public int compare(AbstractEntity o1, AbstractEntity o2) {

Date a = (Date) o1.getCreatedDate();
Date b = (Date) o2.getCreatedDate();

//                // 升序
//                return a.compareTo(b);

//降序
return b.compareTo(a);
}
});
}