java code analysis and structure by tool or pluggin [closed]

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Is there any tool that helps analyse code structure in a java project, either as an eclipse pluggin or as a standalone?

I guess something similar to what Structure101 seems to do, but I am looking for something free.

I.e. to visualize dependencies among jars, classes, class-hierarchies etc.

It is mostly to understand an existing code-base faster, rather than set coding rules or profile etc.

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I've found the following tools useful

1. CodePro Analytics - http://code.google.com/javadevtools/codepro/doc/index.html
2. JDepend - http://www.clarkware.com/software/JDepend.html
3. Sonar - http://www.sonarsource.org/
4. Metrics - http://metrics.sourceforge.net/

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you mean like Sonar?

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Tons of them. The thing is you probably want to google for the kinds of tests, eg, "McCabe complexity java" or "test coverage java".

You might have a look at this wikipedia article.

Update

Aha. Try depfind.