Java Coding Style Automation. Oracle code conventions and Google Java… | by Wenqi Glantz | Feb, 2022

Oracle code conventions and Google Java type

Having a uniform coding type brings many advantages, to call just a few:

  • improves software program readability
  • minimizes software program upkeep prices
  • hastens growth

There are two predominant coding types with regards to creating in Java.

Let’s evaluate these two.

Final Replace Date:

  • Oracle code conventions: April 20, 1999. Meaning newer model of Java corresponding to Java 8 will not be included in that code conventions.
  • Google Java Fashion Information: Might 22, 2018.

IntelliJ plugin:

  • Oracle code conventions: No official plugin for Oracle code conventions.
  • Google Java Fashion Information: google-java-format.


A number of the key variations between these two coding types:


  • Oracle code conventions: 4 areas.
  • Google Java Fashion Information: two areas. It makes the category look extra “condensed”.

Blocks for if/whereas/for statements:

  • Oracle code conventions: blocks are obligatory within the type of “…” for if/whereas/for statements.
  • Google Java Fashion Information: blocks will not be required. One of many explanation why we name Google-style extra “permissive”.

Line Wrapping:

  • Oracle code conventions: For a way with many enter parameters, we wrap the road so long as it doesn’t exceed the column restrict.
  • Google Java Fashion Information: The identical methodology in google type, every enter parameter occupies a single line, leading to extra strains within the file.

Primarily based on the above comparability, we are able to see that every type has its personal professionals and cons. We’re going to discover coding type automation with each choices.

Let’s attempt Google Java type first.

Two issues we can do to automate coding type throughout growth via our IDE, IntelliJ as instance.

Set up

An IntelliJ plugin that reformats Java supply code to adjust to Google Java Fashion. Set up is easy, File → Settings → Plugins, then click on on “Market” tab, seek for “google-java-format”. As soon as you put in it, you can be prompted to restart IntelliJ.


After your IntelliJ restarts, you can be prompted to allow google-java-format plugin. If you happen to miss it, you possibly can all the time go to File → Settings to seek for it after which allow it.


As soon as enabled, now you can format/reformat your file(s), and even your entire challenge! Two methods to do it: “ctrl + alt + L”, or Code → Reformat Code. Let’s take a better take a look at utilizing the keyboard choice.

Open the file you wish to format/reformat, use keyboard “ctrl + alt + L”, you will notice your file fantastically formatted with google java type! You are able to do it for a complete package deal and even the entire challenge, simply click on on the package deal folder, or the challenge root folder in IntelliJ, use keyboard “ctrl + alt + L“, you can be prompted with this window, the primary two checkboxes are checked by default, I additionally checked “Cleanup code”, then press “Run” to see a bunch of your information getting reformatted.

It’s nice now the present information have all been reformatted, how will we guarantee new information or revised blocks in present information adhere to the identical google Java type? Learn on.

This plugin is to make sure any new adjustments to a file are formatted upon save. It helps configurable, Eclipse like, save actions, together with “optimize imports”, “reformat code”, “rearrange code”, “compile file” and a few fast fixes for Java like “add / take away ‘this’ qualifier”, and many others. The plugin executes the configured actions when the file is synchronized (or saved) on disk.

Set up

Comply with the same steps as google-java-format to put in Save Actions plugin.


Go to File → Settings, seek for “save actions”, then examine just a few checkboxes to activate save actions on save or shortcut, additionally decide the formatting actions. You may even apply fast fixes by checking the checkboxes within the backside part.


Now watch it in motion. When you end enhancing a file, press keyboard “ctrl + shift + S” to set off Save Actions, you will notice your code properly formatted!

To totally implement coding type, we want gate keeper on the construct/pipeline degree to catch any missed codecs or glitches throughout growth. To do this, let’s discover Checkstyle.

The plugin comes with two predefined configs: Sun-style and Google-style. For Google type, we are able to obtain its built-in Google style xml file. We are able to rename it to checkstyle.xml or overwrite checkstyle.xml on the challenge root with the brand new content material if you have already got that file in your challenge. Add the next maven plugin in your root pom.


With the above maven configuration, if we run mvn clear set up command, the plugin will scan the information for violations, and it’ll fail the construct if any violations are discovered.

The problems will probably be reported in goal/checkstyle-result.xml file. Comply with the error particulars in goal/checkstyle-result.xml to repair the code, repeat mvn clear set up till all errors have been addressed.

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