How find all unused classes in Intellij Idea?

Question

There is an inspection \"Unused declaration\" which can find all unused code in Intellij Idea. (see this question) But I want to find all unused classes, not

Answer 1

I am not sure if this will answer your question but I used a tool in past as Fortify to run code review rules on the project, that precisely points to the unused imports, dead code, unused classes etc. It is a paid software but I am sure there will be some free plugins/software will be available for same.