Traverse object tree from the middle with reflection

Hi.
I am new to using reflection in more complex scenarios, and would like some advice.
If I get back a partial object tree, from an ORM layer for example, where I have a series of associated objects, for example Employee, which has a Department attribute, linking it to its parent department, and a collection of child address objects, is it possible to traverse all objects attached to Employee, calling a given method on them, if they extend a certain class?
Could someone show an example of doing this, or describe how it could be done?
Thanks for your help.

You have an arbritrarily complex hierarchial collection whith a unknown structure.
You wish to apply a method to all references in the tree.
There are only two basic storage mechanisms in java; reference or array.
Setup: Keep a hashtable/dictionary of each visited reference to avoid endless recursion.
Method, called Doit() which takes an Object 'n'
- If n is null return
- if n is already in hashtable return
- Add to hashtable
- if n is of type base class then call target method (might want to decide about thrown exception.)
- reflect through n for members which are either Object or array (base type Object)
- If single member is Object then call Doit
- If array recurse through each item and call Doit()

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Traverse object tree from the middle with reflection

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