public UserIdNameArrayItem addData(long userId, String userName, int career, int level) {
   UserIdNameArrayItem item = new UserIdNameArrayItem();
   item.setUserId(userId);
   item.setUserName(userName);
   item.setCareer(career);
   item.setLevel(level);
   list.add(item);
   return item;
 }
 /** 解码 */
 @Override
 public void decode(Data data) {
   int size = data.getInt();
   for (int i = 0; i < size; i++) {
     UserIdNameArrayItem item = UserIdNameArrayItem.create();
     item.setUserId(data.getLong());
     item.setUserName(data.getString());
     item.setCareer(data.getInt());
     item.setLevel(data.getInt());
     list.add(item);
   }
 }