public String getHostName() { if (hostName != null) return (hostName);
public String getHostName() { if (hostName != null) return hostName;
    public String getHostName() {        if (hostName != null) return (hostName);        try {            hostName = getHostByAddr(addr);            return (hostName);        } catch (UnknownHostException e) {            if (hostname_alias != null)                return (hostname_alias);            else                return (getHostAddress());        }    }