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Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.

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# Checkstyle - Java Code Quality Tool

![](https://raw.githubusercontent.com/checkstyle/resources/master/img/checkstyle-logos/checkstyle-logo-260x99.png)

--------------------------

*Checkstyle is a tool that ensures adherence to a code standard or a set of best practices.*

[![][appveyor img]][appveyor]
[![][circleci img]][circleci]
[![][cirrusci img]][cirrusci]
[![][coverage img]][coverage]
[![][snyk img]][snyk]
[![][semaphoreci img]][semaphoreci]
[![][azure img]][azure]
[![][error prone img]][error prone]
[![][qodana img]][qodana]
[![][pitest img]][pitest]
[![][checker framework img]][checker framework]
[![][dependabot img]][dependabot]
[![][release notes/version img]][release notes/version]
[![][closed issues img]][closed issues]
[![][link check img]][link check]
[![][milestone img]][milestone]
[![][buildkite img]][buildkite]

[![][mavenbadge img]][mavenbadge]

The latest release version can be found at
[GitHub releases](https://github.com/checkstyle/checkstyle/releases/)
or at [Maven repo](https://repo1.maven.org/maven2/com/puppycrawl/tools/checkstyle/).

Documentation is available in HTML format, see [Checkstyle checks][checks-docs].

## Table of Contents

- [Quick Start](#quick-start)
- [Contributing](#contributing)
- [Feedback and Support](#feedback-and-support)
- [Javadoc](#javadoc)
- [Sponsor Checkstyle](#sponsor-checkstyle)
- [Licensing](#licensing)

## Quick Start

- Download our [Latest Release](https://github.com/checkstyle/checkstyle/releases/) from GitHub
  or add Checkstyle to your build from [Maven Central][maven-central].
- Read our Documentation for [usage](https://checkstyle.org/cmdline.html)
  and [configuration](https://checkstyle.org/config.html).

```bash
$ cat config.xml
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
          "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
          "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
  <module name="TreeWalker">
    <module name="FallThrough"/>
  </module>
</module>

$ cat Test.java
class Test {
  public void foo() {
    int i = 0;
    while (i >= 0) {
      switch (i) {
        case 1:
        case 2:
          i++;
        case 3: // violation 'fall from previous branch of the switch'
          i++;
      }
    }
  }
}

$ java -jar checkstyle-10.18.1-all.jar -c config.xml Test.java
Starting audit...
[ERROR] Test.java:9:9: Fall through from previous branch of switch statement [FallThrough]
Audit done.
Checkstyle ends with 1 errors.
```

## Contributing

Thanks for your interest in contributing to CheckStyle! Please see the
[Contribution Guidelines][contributing-guidelines] for information on how to contribute to the
project. This includes creating issues, submitting pull requests, and setting up your development
environment.

[contributing-guidelines]:
https://github.com/checkstyle/checkstyle/blob/master/.github/CONTRIBUTING.md

## Build Instructions

Please see the [Build Instructions][build-instructions] for
information on how to build the project.

## Feedback and Support

- Visit our [Discussions Page](https://github.com/checkstyle/checkstyle/discussions), where you
  can ask questions and discuss the project with other users and contributors. This is our
  preferred method of communication for topics
  like usage and configuration questions, debugging, and other feedback.
- [Stack Overflow](https://stackoverflow.com/questions/tagged/checkstyle) is another place to
  ask questions about Checkstyle usage.
- If you are interested in contributing to the project, you can join our
  [Discord Contributors Chat](https://discord.com/channels/845645228467159061/1216455699488313554)
  [with invite link](https://discord.gg/FsUsYC2ura).
- Our [Google Groups Forum](https://groups.google.com/forum/?hl=en#!forum/checkstyle) is a
  mailing list for discussion and support; however, we may be slow to respond there.

## Javadoc

Take a look at our [javadoc](https://checkstyle.org/apidocs/index.html) to see
our API documentation.

## Sponsor Checkstyle

Checkstyle is an open-source project that is developed and maintained by volunteers. If you
find Checkstyle useful, please consider sponsoring the project. Your support helps us to
maintain and improve Checkstyle.

- [Liberapay](https://liberapay.com/checkstyle/)
- [OpenCollective](https://opencollective.com/checkstyle/)

[![][backers.opencollective img]][backers.opencollective]

[![][sponsors.opencollective img]][sponsors.opencollective]

## Licensing

Checkstyle is licensed under the [GNU LGPL v2.1 License](LICENSE).
Checkstyle uses libraries:

- [ANTLR](https://www.antlr.org/)
- [Apache Commons](https://commons.apache.org/)
- [Google Guava](https://github.com/google/guava/)
- [Picocli](https://github.com/remkop/picocli/)

## Development Tools Powered by

[![JetBrains logo.][jetbrains img]][jetbrains]

[![JProfiler logo.][jprofiler img]][jprofiler]

[jetbrains]:
https://jb.gg/OpenSource
[jetbrains img]:
https://resources.jetbrains.com/storage/products/company/brand/logos/jetbrains.svg

[jprofiler]:
https://www.ej-technologies.com/jprofiler
[jprofiler img]:
https://www.ej-technologies.com/images/product_banners/jprofiler_medium.png

[appveyor]:
https://ci.appveyor.com/project/checkstyle/checkstyle/history
[appveyor img]:
https://ci.appveyor.com/api/projects/status/rw6bw3dl9kph6ucc?svg=true

[coverage]:
https://codecov.io/github/checkstyle/checkstyle?branch=master
[coverage img]:
https://codecov.io/github/checkstyle/checkstyle/coverage.svg?branch=master

[maven-central]:
https://mvnrepository.com/artifact/com.puppycrawl.tools/checkstyle
[mavenbadge]:
https://central.sonatype.com/artifact/com.puppycrawl.tools/checkstyle
[mavenbadge img]:
https://img.shields.io/maven-central/v/com.puppycrawl.tools/checkstyle.svg?label=Maven%20Central

[stackoverflow]:
https://stackoverflow.com/questions/tagged/checkstyle
[stackoverflow img]:
https://img.shields.io/badge/stackoverflow-CHECKSTYLE-blue.svg

[teamcity]:
https://teamcity.jetbrains.com/viewType.html?buildTypeId=Checkstyle_IdeaInspectionsMaster
[teamcity img]:
https://teamcity.jetbrains.com/app/rest/builds/buildType:(id:Checkstyle_IdeaInspectionsMaster)/statusIcon

[circleci]:
https://circleci.com/gh/checkstyle/checkstyle/tree/master
[circleci img]:
https://circleci.com/gh/checkstyle/checkstyle/tree/master.svg?style=svg

[cirrusci]:
https://cirrus-ci.com/github/checkstyle/checkstyle
[cirrusci img]:
https://api.cirrus-ci.com/github/checkstyle/checkstyle.svg?branch=master

[snyk]:
https://snyk.io/test/github/checkstyle/checkstyle?targetFile=pom.xml
[snyk img]:
https://snyk.io/test/github/checkstyle/checkstyle/badge.svg

[semaphoreci]:
https://checkstyle.semaphoreci.com/projects/checkstyle
[semaphoreci img]:
https://checkstyle.semaphoreci.com/badges/checkstyle/branches/master.svg?style=shields

[azure]:
https://dev.azure.com/romanivanovjr/romanivanovjr/_build/latest?definitionId=1&branchName=master
[azure img]:
https://dev.azure.com/romanivanovjr/romanivanovjr/_apis/build/status/checkstyle.checkstyle?branchName=master

[backers.opencollective]:
https://opencollective.com/checkstyle/
[backers.opencollective img]:
https://opencollective.com/checkstyle/backers/badge.svg

[sponsors.opencollective]:
https://opencollective.com/checkstyle/
[sponsors.opencollective img]:
https://opencollective.com/checkstyle/sponsors/badge.svg

[dependabot]:
https://github.com/dependabot
[dependabot img]:
https://img.shields.io/badge/dependabot-025E8C?style=for-the-badge&logo=dependabot

[closed issues]:
https://github.com/checkstyle/checkstyle/actions/workflows/no-old-refs.yml
[closed issues img]:
https://github.com/checkstyle/checkstyle/actions/workflows/no-old-refs.yml/badge.svg

[release notes/version]:
https://github.com/checkstyle/checkstyle/actions/workflows/releasenotes-gen.yml
[release notes/version img]:
https://github.com/checkstyle/checkstyle/actions/workflows/releasenotes-gen.yml/badge.svg

[link check]:
https://github.com/checkstyle/checkstyle/actions/workflows/run-link-check.yml
[link check img]:
https://github.com/checkstyle/checkstyle/actions/workflows/run-link-check.yml/badge.svg

[error prone]:
https://github.com/checkstyle/checkstyle/actions/workflows/error-prone.yml
[error prone img]:
https://github.com/checkstyle/checkstyle/actions/workflows/error-prone.yml/badge.svg

[pitest]:
https://github.com/checkstyle/checkstyle/actions/workflows/pitest.yml
[pitest img]:
https://github.com/checkstyle/checkstyle/actions/workflows/pitest.yml/badge.svg

[checker framework]:
https://github.com/checkstyle/checkstyle/actions/workflows/checker-framework.yml
[checker framework img]:
https://github.com/checkstyle/checkstyle/actions/workflows/checker-framework.yml/badge.svg

[milestone]:
https://github.com/checkstyle/checkstyle/actions/workflows/set-milestone-on-referenced-issue.yml
[milestone img]:
https://github.com/checkstyle/checkstyle/actions/workflows/set-milestone-on-referenced-issue.yml/badge.svg

[qodana]:
https://github.com/checkstyle/checkstyle/actions/workflows/qodana.yml
[qodana img]:
https://github.com/checkstyle/checkstyle/actions/workflows/qodana.yml/badge.svg

[buildkite]:
https://buildkite.com/checkstyle/ci
[buildkite img]:
https://badge.buildkite.com/7b2915755b859543851a246ca6c9f281c46bb0c599a96f48f4.svg

[checks-docs]:
https://checkstyle.org/checks.html

[build-instructions]:
https://github.com/checkstyle/checkstyle/blob/master/docs/BEGINNING_DEVELOPMENT.md

checkstyle

checkstyle 최신버젼 다운로드

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checkstyle 최신버젼 다운로드

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