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class=docMainContainer_TBSr><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_z5aJ"><div class=docItemContainer_c0TR><article><nav class="theme-doc-breadcrumbs breadcrumbsContainer_Z_bl" aria-label=Breadcrumbs><ul class=breadcrumbs itemscope itemtype=https://schema.org/BreadcrumbList><li class=breadcrumbs__item><a aria-label="Home page" class=breadcrumbs__link href=/><svg viewBox="0 0 24 24" class=breadcrumbHomeIcon_YNFT><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill=currentColor /></svg></a><li class=breadcrumbs__item><span class=breadcrumbs__link>Developer Guide</span><meta itemprop=position content=1><li itemscope itemprop=itemListElement itemtype=https://schema.org/ListItem class="breadcrumbs__item breadcrumbs__item--active"><span class=breadcrumbs__link itemprop=name>Java Format Code</span><meta itemprop=position content=2></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_bxCs"><button type=button class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Java Format Code</h1></header>
<p>The formatting of the Java part of the code in Doris is usually done automatically by the IDE. Only the general format rules are listed here. For developer, you need to set the corresponding code styles in different IDEs according to the format rules.</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id=import-order>Import Order<a href=#import-order class=hash-link aria-label="Direct link to Import Order" title="Direct link to Import Order">​</a></h2>
<div class="codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-text codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token plain">org.apache.doris</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">&lt;blank line></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">third party package</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">&lt;blank line></span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">standard java package</span><br></span><span class=token-line style=color:#F8F8F2><span class="token plain">&lt;blank line></span><br></span></code></pre><div class=buttonGroup__atx><button type=button aria-label="Copy code to clipboard" title=Copy class=clean-btn><span class=copyButtonIcons_eSgA aria-hidden=true><svg viewBox="0 0 24 24" class=copyButtonIcon_y97N><path fill=currentColor d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"/></svg><svg viewBox="0 0 24 24" class=copyButtonSuccessIcon_LjdS><path fill=currentColor d=M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z /></svg></span></button></div></div></div>
<ul>
<li>Do not use <code>import *</code></li>
<li>Do not use <code>import static</code></li>
</ul>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id=check-when-compile>Check when compile<a href=#check-when-compile class=hash-link aria-label="Direct link to Check when compile" title="Direct link to Check when compile">​</a></h2>
<p>Now, when compiling with <code>caven</code>, <code>CheckStyle</code> checks are done by default. This will slightly slow down compilation. If you want to skip checkstyle, please use the following command to compile</p>
<div class="codeBlockContainer_Ckt0 theme-code-block" style=--prism-color:#F8F8F2;--prism-background-color:#282A36><div class=codeBlockContent_biex><pre tabindex=0 class="prism-code language-text codeBlock_bY9V thin-scrollbar" style=color:#F8F8F2;background-color:#282A36><code class=codeBlockLines_e6Vv><span class=token-line style=color:#F8F8F2><span class="token plain">mvn clean install -DskipTests -Dcheckstyle.skip</span><br></span></code></pre><div class=buttonGroup__atx><button type=button aria-label="Copy code to clipboard" title=Copy class=clean-btn><span class=copyButtonIcons_eSgA aria-hidden=true><svg viewBox="0 0 24 24" class=copyButtonIcon_y97N><path fill=currentColor d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"/></svg><svg viewBox="0 0 24 24" class=copyButtonSuccessIcon_LjdS><path fill=currentColor d=M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z /></svg></span></button></div></div></div>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id=checkstyle-plugin>Checkstyle Plugin<a href=#checkstyle-plugin class=hash-link aria-label="Direct link to Checkstyle Plugin" title="Direct link to Checkstyle Plugin">​</a></h2>
<p>Now we have <code>formatter-check</code> in <code>CI</code> to check the code format.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id=idea>IDEA<a href=#idea class=hash-link aria-label="Direct link to IDEA" title="Direct link to IDEA">​</a></h3>
<p>If you use <code>IDEA</code> to develop Java code, please install <code>Checkstyle-IDEA</code> plugin.</p>
<p>Setting the <code>checkstyle.xml</code> file in <code>Tools->Checkstyle</code>.</p>
<p>Click the plus sign under Configuration File, select <code>Use a local Checkstyle file</code>, and select the <code>fe/check/checkstyle/checkstyle.xml</code> file.</p>
<p><strong>NOTE:</strong> Make sure that the version of <code>Checkstyle</code> is 9.3 or newer (the latest version is recommended).</p>
<p><img decoding=async loading=lazy src=/assets/images/idea-checkstyle-version-8dd2c11f9b1ff58b36f42a13985e86d9.png width=753 height=146 class=img_ev3q></p>
<p><strong>You can use <code>Checkstyle-IDEA</code> plugin to check <code>Checkstyle</code> of your code real-time.</strong></p>
<p><img decoding=async loading=lazy src=/assets/images/idea-checkstyle-plugin-en-f5edce6f551fe2cbe4bd969969157378.png width=826 height=527 class=img_ev3q></p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id=vs-code>VS Code<a href=#vs-code class=hash-link aria-label="Direct link to VS Code" title="Direct link to VS Code">​</a></h3>
<p>If you use VS Code to develop Java code, please install <code>Checkstyle for Java</code> plugin, and config according to the <a href=https://code.visualstudio.com/docs/java/java-linting target=_blank rel="noopener noreferrer">document</a> and the picture</p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id=idea-1>IDEA<a href=#idea-1 class=hash-link aria-label="Direct link to IDEA" title="Direct link to IDEA">​</a></h2>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id=auto-format-code>Auto format code<a href=#auto-format-code class=hash-link aria-label="Direct link to Auto format code" title="Direct link to Auto format code">​</a></h3>
<p>The automatic formatting function of <code>IDEA</code> is also recommended.</p>
<p>Go to <code>Preferences->Editor->Code Style->Java</code> click the config sign and select <code>Import Scheme</code>，select <code>IntelliJ IDEA code style XML</code>，and select the <code>build-support/IntelliJ-code-format.xml</code> file.</p>
<h3 class="anchor anchorWithStickyNavbar_LWe7" id=auto-rearrange-code>Auto rearrange code<a href=#auto-rearrange-code class=hash-link aria-label="Direct link to Auto rearrange code" title="Direct link to Auto rearrange code">​</a></h3>
<p>Checkstyle will check declarations order according to <a href=https://www.oracle.com/java/technologies/javase/codeconventions-fileorganization.html#1852 target=_blank rel="noopener noreferrer">Class and Interface Declarations</a> .</p>
<p>After add the <code>build-support/IntelliJ-code-format.xml</code> file. Click <code>Code/Rearrange Code</code> to auto rearrange code.</p>
<p><img decoding=async loading=lazy src=/assets/images/idea-rearrange-code-84eb3793733a97939b36cf0a30678101.png width=808 height=862 class=img_ev3q></p>
<h2 class="anchor anchorWithStickyNavbar_LWe7" id=remove-unused-header>Remove unused header<a href=#remove-unused-header class=hash-link aria-label="Direct link to Remove unused header" title="Direct link to Remove unused header">​</a></h2>
<p><strong>CTRL + ALT + O ---></strong> to remove the unused imports in windows.</p>
<p>Auto remove unused header and reorder according to configure xml:</p>
<p>Click <code>Preferences->Editor->Auto Import->Optimize Imports on the Fly</code></div></article><div class="flex items-center text-sm lg:text-base justify-end lg:col mt-10"><a href="https://github.com/apache/doris-website/issues/new?title=Issue on docs&body=Path:false" target=_blank rel="noopener noreferrer" class="lg:mr-6 footerBtn_e3I8"><svg width=20 height=20 viewBox="0 0 20 20" fill=none><path d="M9.48038 2.9C9.71132 2.5 10.2887 2.5 10.5196 2.9L18.1406 16.1C18.3716 16.5 18.0829 17 17.621 17H2.37898C1.9171 17 1.62842 16.5 1.85936 16.1L9.48038 2.9Z" stroke=currentColor stroke-width=1.2 stroke-linecap=round /><path d="M10.5699 7.9516C10.5874 7.5628 10.2769 7.23804 9.88766 7.23804C9.49847 7.23804 9.18796 7.5628 9.20543 7.9516L9.41597 12.6385C9.42731 12.8908 9.63513 13.0895 9.88766 13.0895C10.1402 13.0895 10.348 12.8908 10.3593 12.6385L10.5699 7.9516ZM9.89338 13.7638C9.65338 13.7638 9.44766 13.8323 9.28766 13.9923C9.12766 14.1409 9.04766 14.3352 9.04766 14.5752C9.04766 14.8152 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