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Showing content from https://github.com/google/google-java-format below:

google/google-java-format: Reformats Java source code to comply with Google Java Style.

google-java-format is a program that reformats Java source code to comply with Google Java Style.

java -jar /path/to/google-java-format-${GJF_VERSION?}-all-deps.jar <options> [files...]

Note that it uses the jdk.compiler module to parse the Java source code. The java binary version used must therefore be from a JDK (not JRE) with a version equal to or newer than the Java language version of the files being formatted. The minimum Java version can be found in core/pom.xml (currently Java 17). An alternative is to use the available GraalVM based native binaries instead.

The formatter can act on whole files, on limited lines (--lines), on specific offsets (--offset), passing through to standard-out (default) or altered in-place (--replace).

To reformat changed lines in a specific patch, use google-java-format-diff.py.

Note: There is no configurability as to the formatter's algorithm for formatting. This is a deliberate design decision to unify our code formatting on a single format.

IntelliJ, Android Studio, and other JetBrains IDEs

A google-java-format IntelliJ plugin is available from the plugin repository. To install it, go to your IDE's settings and select the Plugins category. Click the Marketplace tab, search for the google-java-format plugin, and click the Install button.

The plugin will be disabled by default. To enable, open the Project settings, then click "google-java-format Settings" and check the "Enable google-java-format" checkbox.

To enable it by default in new projects, open the default settings for new projects and configure it under "Other Settings/google-java-format Settings".

When enabled, it will replace the normal Reformat Code and Optimize Imports actions.

The google-java-format plugin uses some internal classes that aren't available without extra configuration. To use the plugin, you need to add some options to your IDE's Java runtime. To do that, go to Help→Edit Custom VM Options... and paste in these lines:

--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED

Once you've done that, restart the IDE.

The latest version of the google-java-format Eclipse plugin can be downloaded from the releases page. Drop it into the Eclipse drop-ins folder to activate the plugin.

The plugin adds a google-java-format formatter implementation that can be configured in Window > Preferences > Java > Code Style > Formatter > Formatter Implementation.

Visual Studio Code
- google-java-format-for-vs-code
Gradle plugins
- spotless
- sherter/google-java-format-gradle-plugin
Apache Maven plugins
- spotless
- spotify/fmt-maven-plugin
- talios/googleformatter-maven-plugin
- Cosium/maven-git-code-format: A maven plugin that automatically deploys google-java-format as a pre-commit git hook.
SBT plugins
- sbt/sbt-java-formatter
Github Actions
- googlejavaformat-action: Automatically format your Java files when you push on github

The formatter can be used in software which generates java to output more legible java code. Just include the library in your maven/gradle/etc. configuration.

google-java-format uses internal javac APIs for parsing Java source. The following JVM flags are required when running on JDK 16 and newer, due to JEP 396: Strongly Encapsulate JDK Internals by Default:

--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED
--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED

<dependency>
  <groupId>com.google.googlejavaformat</groupId>
  <artifactId>google-java-format</artifactId>
  <version>${google-java-format.version}</version>
</dependency>

dependencies {
  implementation 'com.google.googlejavaformat:google-java-format:$googleJavaFormatVersion'
}

You can then use the formatter through the formatSource methods. E.g.

String formattedSource = new Formatter().formatSource(sourceString);

CharSource source = ...
CharSink output = ...
new Formatter().formatSource(source, output);

Your starting point should be the instance methods of com.google.googlejavaformat.java.Formatter.

Please see the contributors guide for details.

Copyright 2015 Google Inc.

Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations under
the License.

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