How to auto-format code in Eclipse?

CTRL + SHIFT + F will auto format your code (whether it is highlighted or non highlighted).

Another option is to go to Window->Preferences->Java->Editor->SaveActions and check the Format source code option. Then your source code will be formatted truly automatically each time you save it.

On Windows and Linux : Ctrl + Shift + F

On Mac : ⌘ + ⇧ + F

(Alternatively you can press Format in Main Menu > Source)