实体类集合安某个字段排序

sort(dylist, "clientno", true);

public static void sort(List list, String filedName, boolean ascFlag) {
        if (list.size() == 0 || filedName.equals("")) {
            return;
        }
        Comparator<?> cmp = ComparableComparator.getInstance();
        if (ascFlag) {
            cmp = ComparatorUtils.nullLowComparator(cmp);
        } else {
            cmp = ComparatorUtils.reversedComparator(cmp);

        }
        Collections.sort(list, new BeanComparator(filedName, cmp));
    }