Useful intelliJ shortcuts those are good know

How to remove unused imports in intelliJ?

In Mac IntelliJ IDEA, the command is:

Cmd + Option + O

(Letter O not Zero 0)

For some older versions it is apparently Ctrl + Option + O.

Ctrl + Option + O

(Letter O not Zero 0)

For windows

Ctrl + Alt + O

(Letter O not Zero 0)