从整型数组中随机产生整型集合

public static List<Long> generateIds(int[] ids, int count) {
  Random r = new Random();
  int irdm = 0;
  List<Long> rs = new ArrayList<Long>();
  if (ids.length < count) {
   count = ids.length;
  }
  for (int i = 0; i < count; i++) {
   irdm = r.nextInt(ids.length - i);
   rs.add(Long.parseLong(ids[irdm] + ""));

   for (int j = irdm; j < ids.length - i - 1; j++) {
    ids[j] = ids[j + 1];
   }
  }
  return rs;

}