How create class diagram automatically?

Hi Friends,
Do you have any idea to generate class diagram automatically? Can you provide a software/IDE name used to generate class diagram automatically from the code itself means reverse engineering?
Thanks in advance...
- Hiren Modi

BlueJ I believe automatically creates UML diagrams.
Here's something a google search came up with:
http://www.altova.com/features_reverse_engineer.html
http://www.visual-paradigm.com/

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