How to read address field in Apex

Lead  obj=[Select Id,CreatedById,Address,Status from Lead where ID ='00Qc0000007mA76EAE'];
address addr = obj.Address;
 String streetAddr = '';
if (null != addr) streetAddr = addr.getStreet();
system.debug('street***'+streetAddr);
String states = '';
if (null != addr) states = addr.getState();
system.debug('states***'+states);