Intellij shortcut to convert code to upper or lower case?

According to the documentation :

Ctrl + Shift + U : Toggle case of the selected text block

I would highly recommend String Manipulation plugin for Intellij.

With a simple Alt + M (Option + M for Mac) you get:

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So you can easily manipulate with strings in the following way:

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Ctrl + Shift + U

In the future try typing: Ctrl + Shift + A and look for any actions you like. Here: Toggle Case.

Or ⌘ Command + Shift + U if you are using Mac OSX.

If you are an Ubuntu User you will notice that Ctrl + Shift + U will add an u instead of toggling the case.

The solution for me was to change the KeyMap from:

Ctrl + Shift + U --> Alt + Shift + U

You can do so with this Docs

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