for (Iterator i = users.values().iterator(); i.hasNext();) {
for (Iterator i = users.valueIterator(); i.hasNext();) {
	public synchronized boolean hasUser(String name) {		User user;		for (Iterator i = users.values().iterator(); i.hasNext();) {			user = (User) i.next();			if (user.getName().equals(name))				return true;		}		return false;	}