HashMap whoisRef = new HashMap(); public String getUserHost(final String userName) { whoisRef.put(userName.toLowerCase(), null); sendRawLine("WHOIS "+ userName); } public void onServerResponse(int code, String response) { if(code == RPL_WHOISUSER) { String parts[] = response.split(" "); String userName = parts[1].toLowerCase(); if(whoisRef.containsKey(userName)) { // nick whoisRef.remove(userName); doMyDBStuff(username, parts[3]); } } }