Class Diagram Tool For Hundreds Of Classes?

St0rk asks: "I am trying to make sense of someone else's Java code. He is another programmer in my team, but uses different programming style that generates tons of classes (just as the tick books say ;-). We are talking about 300 files, and approximately 430 classes here. I am looking for a tool/package/program that can take a relatively big amount of OO source code (Java classes) and build useful diagrams/documentation. Please note that I used 'useful.' Most of the tools out there can produce some hierarchy diagrams, but they either get too unreadable when one is dealing with so many classes, or miss too much (for example when a class A has a Vector that is going to be filled with objects of type B, there won't be a link between A and B genereated). It would be great if I can good prints as well. Any suggestions based on real life experience? (Rational Rose is too expensive, BTW)"