对象排序

  Object[] users = list.toArray();
   Arrays.sort(users, new ListFileUtilComparator());

---------------
public class ListFileUtilComparator implements Comparator<Object>
{
    public int compare(Object obj1, Object obj2)
    {
        FileUpdate fileUpdate = (FileUpdate)obj1;
        FileUpdate fileUpdate2 = (FileUpdate)obj2;
        if (DateTimeUtil.detailTimeToLong(fileUpdate.getDate()) > DateTimeUtil.detailTimeToLong(fileUpdate2.getDate()))
        {
            return -1;
        }
        return 1;
       
    }
}