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Checkstyle - Java Code Quality Tool

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

The latest release version can be found at GitHub releases or at Maven repo.

Documentation is available in HTML format, see Checkstyle checks.

Table of Contents

Quick Start

$ 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 for information on how to contribute to the project. This includes creating issues, submitting pull requests, and setting up your development environment.

Build Instructions

Please see the CheckStyle Documentation for information on how to build the project.

Feedback and Support

  • Visit our Discussions Page, 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 is another place to ask questions about Checkstyle usage.
  • If you are interested in contributing to the project, you can join our Discord Contributors Chatwith invite link.
  • Our Google Groups Forum is a mailing list for discussion and support; however, we may be slow to respond there.

Javadoc

Take a look at our javadoc 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.

Licensing

Checkstyle is licensed under the GNU LGPL v2.1 License. Checkstyle uses libraries:

Development Tools Powered by

JetBrains logo.

JProfiler logo.

About

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.

checkstyle.org

Resources

Readme
License

Code of conduct

Code of conduct

Contributing

Contributing

Security policy

Security policy
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0 watching

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0 forks
Report repository

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Checkstyle - Java Code Quality Tool
Checkstyle is a tool that ensures adherence to a code standard or a set of best practices.
The latest release version can be found at
GitHub releases
or at Maven repo.
Documentation is available in HTML format, see Checkstyle checks.
Table of Contents
Quick Start
$ 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 for information on how to contribute to the
project. This includes creating issues, submitting pull requests, and setting up your development
environment.
Build Instructions
Please see the CheckStyle Documentation for
information on how to build the project.
Feedback and Support
  • Visit our Discussions Page, 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 is another place to
ask questions about Checkstyle usage.
  • If you are interested in contributing to the project, you can join our
Discord Contributors Chatwith invite link.
  • Our Google Groups Forum is a
mailing list for discussion and support; however, we may be slow to respond there.
Javadoc
Take a look at our javadoc 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.
Licensing
Checkstyle is licensed under the GNU LGPL v2.1 License.
Checkstyle uses libraries:
Development Tools Powered by
JetBrains logo.
JProfiler logo.
About
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.
checkstyle.org
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Checkstyle - Java Code Quality Tool
Checkstyle is a tool that ensures adherence to a code standard or a set of best practices.
The latest release version can be found at
GitHub releases
or at Maven repo.
Documentation is available in HTML format, see Checkstyle checks.
Table of Contents
Quick Start
$ 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 for information on how to contribute to the
project. This includes creating issues, submitting pull requests, and setting up your development
environment.
Build Instructions
Please see the CheckStyle Documentation for
information on how to build the project.
Feedback and Support
  • Visit our Discussions Page, 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 is another place to
ask questions about Checkstyle usage.
  • If you are interested in contributing to the project, you can join our
Discord Contributors Chatwith invite link.
  • Our Google Groups Forum is a
mailing list for discussion and support; however, we may be slow to respond there.
Javadoc
Take a look at our javadoc 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.
Licensing
Checkstyle is licensed under the GNU LGPL v2.1 License.
Checkstyle uses libraries:
Development Tools Powered by
JetBrains logo.
JProfiler logo.
About
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.
checkstyle.org
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Checkstyle - Java Code Quality Tool
Checkstyle is a tool that ensures adherence to a code standard or a set of best practices.
The latest release version can be found at
GitHub releases
or at Maven repo.
Documentation is available in HTML format, see Checkstyle checks.
Table of Contents
Quick Start
$ 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 for information on how to contribute to the
project. This includes creating issues, submitting pull requests, and setting up your development
environment.
Build Instructions
Please see the CheckStyle Documentation for
information on how to build the project.
Feedback and Support
  • Visit our Discussions Page, 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 is another place to
ask questions about Checkstyle usage.
  • If you are interested in contributing to the project, you can join our
Discord Contributors Chatwith invite link.
  • Our Google Groups Forum is a
mailing list for discussion and support; however, we may be slow to respond there.
Javadoc
Take a look at our javadoc 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.
Licensing
Checkstyle is licensed under the GNU LGPL v2.1 License.
Checkstyle uses libraries:
Development Tools Powered by
JetBrains logo.
JProfiler logo.
About
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.
checkstyle.org
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
Checkstyle - Java Code Quality Tool
Checkstyle is a tool that ensures adherence to a code standard or a set of best practices.
The latest release version can be found at
GitHub releases
or at Maven repo.
Documentation is available in HTML format, see Checkstyle checks.
Table of Contents
Quick Start
$ 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 for information on how to contribute to the
project. This includes creating issues, submitting pull requests, and setting up your development
environment.
Build Instructions
Please see the CheckStyle Documentation for
information on how to build the project.
Feedback and Support
  • Visit our Discussions Page, 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 is another place to
ask questions about Checkstyle usage.
  • If you are interested in contributing to the project, you can join our
Discord Contributors Chatwith invite link.
  • Our Google Groups Forum is a
mailing list for discussion and support; however, we may be slow to respond there.
Javadoc
Take a look at our javadoc 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.
Licensing
Checkstyle is licensed under the GNU LGPL v2.1 License.
Checkstyle uses libraries:
Development Tools Powered by
JetBrains logo.
JProfiler logo.
About
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.
checkstyle.org
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Checkstyle - Java Code Quality Tool
Checkstyle is a tool that ensures adherence to a code standard or a set of best practices.
The latest release version can be found at
GitHub releases
or at Maven repo.
Documentation is available in HTML format, see Checkstyle checks.
Table of Contents
Quick Start
$ 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 for information on how to contribute to the
project. This includes creating issues, submitting pull requests, and setting up your development
environment.
Build Instructions
Please see the CheckStyle Documentation for
information on how to build the project.
Feedback and Support
  • Visit our Discussions Page, 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 is another place to
ask questions about Checkstyle usage.
  • If you are interested in contributing to the project, you can join our
Discord Contributors Chatwith invite link.
  • Our Google Groups Forum is a
mailing list for discussion and support; however, we may be slow to respond there.
Javadoc
Take a look at our javadoc 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.
Licensing
Checkstyle is licensed under the GNU LGPL v2.1 License.
Checkstyle uses libraries:
Development Tools Powered by
JetBrains logo.
JProfiler logo.
About
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.
checkstyle.org
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
Checkstyle - Java Code Quality Tool
Checkstyle is a tool that ensures adherence to a code standard or a set of best practices.
The latest release version can be found at
GitHub releases
or at Maven repo.
Documentation is available in HTML format, see Checkstyle checks.
Table of Contents
Quick Start
$ 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 for information on how to contribute to the
project. This includes creating issues, submitting pull requests, and setting up your development
environment.
Build Instructions
Please see the CheckStyle Documentation for
information on how to build the project.
Feedback and Support
  • Visit our Discussions Page, 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 is another place to
ask questions about Checkstyle usage.
  • If you are interested in contributing to the project, you can join our
Discord Contributors Chatwith invite link.
  • Our Google Groups Forum is a
mailing list for discussion and support; however, we may be slow to respond there.
Javadoc
Take a look at our javadoc 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.
Licensing
Checkstyle is licensed under the GNU LGPL v2.1 License.
Checkstyle uses libraries:
Development Tools Powered by
JetBrains logo.
JProfiler logo.
About
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.
checkstyle.org
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
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0 stars
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0 watching
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0 forks
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Checkstyle - Java Code Quality Tool
Checkstyle is a tool that ensures adherence to a code standard or a set of best practices.
The latest release version can be found at
GitHub releases
or at Maven repo.
Documentation is available in HTML format, see Checkstyle checks.
Table of Contents
Quick Start
$ 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 for information on how to contribute to the
project. This includes creating issues, submitting pull requests, and setting up your development
environment.
Build Instructions
Please see the CheckStyle Documentation for
information on how to build the project.
Feedback and Support
  • Visit our Discussions Page, 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 is another place to
ask questions about Checkstyle usage.
  • If you are interested in contributing to the project, you can join our
Discord Contributors Chatwith invite link.
  • Our Google Groups Forum is a
mailing list for discussion and support; however, we may be slow to respond there.
Javadoc
Take a look at our javadoc 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.
Licensing
Checkstyle is licensed under the GNU LGPL v2.1 License.
Checkstyle uses libraries:
Development Tools Powered by
JetBrains logo.
JProfiler logo.
About
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.
checkstyle.org
Resources
Readme
License
Code of conduct
Code of conduct
Contributing
Contributing
Security policy
Security policy
Activity
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages