How do I initialize classes with lots of fields in an elegant way?

Question

In my application, I have to instantiate many different types of objects. Each type contains some fields and needs to be added to a containing type. How can I do this in an

Answer 1

Some nice answeres are already given here!

What came to my mind as an addition is Domain Driven Design. Specific the Building blocks part, with Entity, Value Object, Aggregate, Factory etc.

A nice introduction is given in Domain Driven Design - Quickly (pdf).