Hibernate: How to get result from query with multiple classes

If my query contains one class, like:

query = session.createQuery("select u from User as u");
queryResult = query.list();

then I iterate it, where queryResult is an object of User class.

So how to get result from query which contains more than one class? For example:

select u, g from User as u, Group as g where u.groupId = g.groupId and g.groupId = 1