code: public Ids pushMessages(String[] msg, long delay) throws IOException {
          ArrayList<Message> messages = new ArrayList<Message>();
          for (String messageName: msg){
              Message message = new Message();
              message.setBody(messageName);
              message.setDelay(delay);
              messages.add(message);
          }
  
          MessagesArrayList msgs = new MessagesArrayList(messages);
  
          IronReader reader = client.post("queues/" + name + "/messages", msgs);
          Ids ids = gson.fromJson(reader.reader, Ids.class);
          reader.close();
          return ids;
      }
docs: Pushes a messages onto the queue.
  
  @param msg The array of the messages to push.
  @param delay The message's delay in seconds.
  @return The IDs of new messages
  
  @throws io.iron.ironmq.HTTPException If the IronMQ service returns a status other than 200 OK.
  @throws java.io.IOException If there is an error accessing the IronMQ server.