Creating design document from existing java code

I have existing java code and need to create Design Document based on that.

For starter even if I could get all functions with input / output parameters that will help in overall proces.

Note: There is not commeted documentation on any procedures, function or classes.

Last but not least. Let me know for any good tool which will reduc开发者_如何学JAVAe time required for this phase. As currently we write every flow and related stuffs.

What you want is just too much. Quoting Linus Torvalds: “Good code is its own best documentation.”. Anyway, I digress.

You might want to look into UML tools which generate class/sequence diagrams from the code. There are many of them but only a handful support reverse engineering (into and from the class diagram), and even fewer subset support the same to/from sequence diagram. I only know MagicDraw could do this, but I am biased as I used to work for the manufacturer of this tool so do your shopping around first.

Use java docs: http://www.oracle.com/technetwork/java/javase/documentation/index-137868.html

or Introspection: http://docs.oracle.com/javase/tutorial/reflect/class/classMembers.html