List<District> districtList)
{
Map<Long, List<District>> disMap = new HashMap<Long, List<District>>();
for (int i = 0; i < districtList.size(); i++)
{
District district = districtList.get(i);
Long parentId = district.getParentId();
Long key = parentId;
if (parentId == null || parentId == 0)
{
key = 0L;
}