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

• Press Ctrl+Shift+A (in Mac Command+Shift+A)
• Enter "unused declar"
• Double-click on "Unused declaration"

Settings will pop up

• Click on Java/Declaration redundancy/Unused declaration
• on the right bottom select "On the fly editor settings"
• untick check fields, ..., check parameters. Only Check Classes should be ticked.
• Press OK

Settings closes

• On the menu bar, click on Analyze / Run Inspection by Name (or Ctrl+Alt+Shift+I - in Mac Command+Option+Shift+I)
• Insert text "Unused decla"
• Select "Unused declaration Java|Declaration redundancy"

Search starts

• Check the job state on bottom of Idea, when finished: enjoy the results and the great feeling of cleaning up the messed code. :)