In Eclipse, under Windows -> Preference -> Java -> Code Style, you can define code templates for comments and code, and you can setup a code formatter.
I'm wondering if it is possible in Eclipse to have these setting take affect every time I save a source file. Basically, instead of me highlighting everything and pressing Ctrl+Shift+F, I want Eclipse to be responsible for making sure my code is formatted properly.
Is this possible and how do you set it up?
Note On Using the Auto-Format: It's probably best to choose "Format Edited Lines" as merging changes becomes very difficult when you reformat a whole file that is in source control already that was not formatted properly. Already did this to a co-worker.
Under Preferences, choose Java --> Editor --> Save Actions. Check the Perform the selected actions on save, and check the Format source code box.
This may or may not be available in previous versions of Eclipse. I know it works in:
Version: 3.3.3.r33x_r20080129-_19UEl7Ezk_gXF1kouft<br>
Build id: M20080221-1800
I strongly recommend checking your eclipse format xml descriptor into source control. That way all members of the team can use it and you don't get to and fro reformatting battles.
I have a snapshot of the setting. Please follow the path:
In the Preferences window, choose Java --> Editor --> Save Actions.
Check the Perform the selected actions on save, and check the Format source code box.
If you find that you do not have a Save Actions preference under Java--> Editor, it may be because you are using an older version of Eclipse. In that case you can install the Format on save plugin from here.
Then, under Preferences, choose Java --> Format on save. Select the Run Format option under Select a code formatting action
来源：https://stackoverflow.com/questions/234594/eclipse-can-you-format-code-on-save