intellij shortcut - how to fold all javadocs + method implementations

Go to File\Settings\Keymap\Main menu\Code\Folding (or just search for "Expand doc comments" in Settings.

You can set a custom shortcut (i.e. CTRL + ALT + SHIFT + +/-) to expand or collapse all Javadocs in the file.

Code Folding of a whole file is

Ctrl+Shift+Minus and Ctrl+Shift+Numpad_Plus

or in the menu

choose Code | Folding | Collapse All or Code | Folding | Expand All.

For more shortcuts for code folding:

Code Folding Shortcuts in IntelliJ

Docs for Code Folding Shortcuts

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