code: public void addFriend(Friend friend) {
  		try {
  			get().addEntry(friend.get());
  		} catch (NoResponseException | XMPPErrorException
  				| NotConnectedException e) {
  			e.printStackTrace();
  		}
  	}
docs: Moves a friend to this group and removes the friend from his previous
  group. This is an asynchronous call.
  
  @param friend
  The friend you want to move