Use Google Java Code Style

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Installing the coding style settings in Eclipse

Google Java Code Style

Download the eclipse-java-google-style.xml. Under Window/Preferences select Java/Code Style/Formatter. Import the settings file by selecting Import.

Configure save actions to automatically format your code when saving

In the Preferences menu, select Java -> Editor -> Save Actions.

Select Perform the selected actions on save.
Select Format source code.
Click the Formatter” link and ensure the “GoogleStyle formatter is selected as active.
Click OK.

Now, whenever you make changes to your code, you can use the format source code menu item, or just save the file and formatting will be applied automatically.