blocks|key|1013496|text|您需要指定源目录|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013497|File>+Project+Structure+>+Modules|code-block|syntax|javascript|1013498|单击目录，然后单击源按钮|1013499|这很奇怪，因为它通常是自动完成的。也许你重新创建这个项目会更好。|1013500|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You need to specify the source dir

<pre><code>File&gt; Project Structure &gt; Modules
</code></pre>

click the directory and click the Sources button

It's weird because usually it's done automatically. Maybe it's better if you recreate the project again.

blocks|key|1013877|text|上面来自irreputable的第一个答案是“你需要指定源目录”是正确的，但我不认为他会告诉你这个简单的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013878|只需右键单击java+sources文件夹(例如，如果是Maven项目，则在src/main/java下的“java”)并选择Mark+Directory+As+>+Sources+Root+(参见下面的屏幕截图)。|1013879|​|1013880|📷|atomic|offset|length|1013881|1013882|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/8fd547d50ec7e8ea927e2cb97657e9ae.png|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@$I|Y|J|Z|1|10]]|A|$]]|$1|K|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]]]

The first answer from irreputable above that starts out with "you need to specify the source dir" is correct, but I don't see him telling you the easy way to do so.

Simply right click on the java sources folder ("java" under src/main/java if it is a Maven project for example) and select Mark Directory As > Sources Root (see screenshot below).

<a href="https://i.stack.imgur.com/clMWS.png" rel="noreferrer"><img src="https://i.stack.imgur.com/clMWS.png" alt="enter image description here"></a>

blocks|key|799214|text|当IDE查找src文件夹，但在路径中找不到它时，就会出现这种情况。选择项目根目录(windows中的F4)>转到Modules+on+Side+Tab+>+Select+Sources+>+Select+folder+with+source+files+in+it>点击蓝色的Sources文件夹图标(用于添加源文件)>点击绿色的Test+sources文件夹(用于添加单元测试文件夹)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799215|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

This situation happens when the IDE looks for src folder, and it cannot find it in the path.
Select the project root (F4 in windows) > Go to Modules on Side Tab > Select Sources > Select appropriate folder with source files in it> Click on the blue sources folder icon (for adding sources) > Click on Green Test Sources folder ( to add Unit test folders).

blocks|key|799353|text|在这里查找所有IntelliJ+(v15)符号：https://www.jetbrains.com/idea/help/symbols.html|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|799354|该站点声明此图标代表“位于源根目录之外的Java类。有关详细信息，请参阅配置内容根部分。”|799355|entityMap|0|LINK|mutability|MUTABLE|url|https://www.jetbrains.com/idea/help/symbols.html^0|O|1C|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Find all IntelliJ (v15) symbols over here: <a href="https://www.jetbrains.com/idea/help/symbols.html" rel="nofollow">https://www.jetbrains.com/idea/help/symbols.html</a>

This site states that this icon stands for "Java class located out of the source root. Refer to the section Configuring Content Roots for details."

blocks|key|1013803|text|如果你在Android+Studio中使用风格，另一个选择是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013804|单击Build+->选择Build+Variant。|1013805|在列表中，单击您正在使用的变体，它将变为绿色，其他变体将显示红色的J。|1013806|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Another option if you're using Flavors in Android Studio:

Click Build -> Select Build Variant. 

In the list click the variant you're working in and it will turn green and the others will have the red J.

blocks|key|1014105|text|首先将目录标记为源根目录。然后转到pom+excel并右键单击它。选择add+as+maven+project。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1014106|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

First mark the directory as the source root.
Then go to the pom excel and right click on it.
select add as maven project .

blocks|key|1013644|text|我从github下载了一个包含.idea文件夹的项目。删除该文件夹后，一切正常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013645|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I downloaded a project from github with .idea folder.
After deleting that folder, everything was ok.

blocks|key|799745|text|这简直要了我的命，因为我也有同样的问题。我只是在复习以前的项目。为了得到更多的练习，我真的重新做了一遍以前的课程。repos只是存在兼容性问题。所以我导入了这个项目。然后像其他状态一样添加源代码。然后关闭该项目。删除根目录中的.idea目录，然后重新导入项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799746|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

This was killing me as I had the same issue. I just going over old projects. Really redoing old lessons from class to get more practice. The repos just have compatibility issues. So I import the project. Then add the source like others state. Then close the project. Delete the .idea directory in the root and re-import project.

blocks|key|799039|text|这意味着这些文件不是项目设置的一部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799040|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It means those files aren't part of the project settings.

blocks|key|799400|text|将java文件夹标记为root.It将解析的源文件夹。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799401|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

mark the java folder as source root.It will solve.

blocks|key|1013952|text|也许你的项目还没有被android+studio作为android项目，请确保插件'android+support‘已经启用(+Android+Studio偏好设置->插件->精选Android支持)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1013953|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Maybe your project has not been as android project by android studio, please make sure that plugin 'android support' has been enabled（Android Studio Preferences -> Plugins -> Select Android Support）

blocks|key|1014014|text|关闭Android+Studio，从工程结构中删除.idea和.gradle文件夹，然后重新启动Studio。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1014015|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Close Android Studio and delete .idea and .gradle folder from project structure and start Studio again.

blocks|key|799676|text|这意味着您的Java源文件不是项目的一部分。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799677|如果这里提到的建议不能解决问题，那么您可能像我一样遇到了一个罕见的bug。研究在the+log中发现的异常对我很有帮助。在我的例子中，禁用"Plugin+DevKit"，删除.idea目录，然后重新导入项目就行了。|offset|length|799678|entityMap|0|LINK|mutability|MUTABLE|url|https://intellij-support.jetbrains.com/hc/en-us/articles/207241085^0|0|14|7|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

It means your Java source files aren't part of the project. 

If the suggestions mentioned here don't resolve the issue, you may have hit a rare bug like I did. Researching the exceptions found in <a href="https://intellij-support.jetbrains.com/hc/en-us/articles/207241085" rel="nofollow noreferrer">the log</a> helped me. In my case, disabling the "Plugin DevKit", deleting the .idea directory, and reimporting the project worked.

blocks|key|799802|text|对于gradle项目，"./gradlew+--stop“将帮助解决源目录被正确指定且项目被正确同步时的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|799803|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For a gradle project &quot;./gradlew --stop&quot; will help to resolve the problem when the source directory is correctly specified and project is properly synced.

Under the target folder in IntelliJ for a Java project I created, I have a few java source files in the package. Beside each file the 'J' icon has a red circle with a line through it.

What does that mean? How do I fix it?

What does this symbol mean in IntelliJ? (red circle on bottom-left corner of file name, with 'J' in it)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在我创建的IntelliJ项目的目标文件夹下，包中有几个Java源文件。在每个文件旁边，“J”图标都有一个红色圆圈，上面有一条线穿过它。那是什么意思？我该如何修复它？

问这个符号在IntelliJ中是什么意思？(文件名左下角的红色圆圈，里面有'J‘)
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