blocks|key|773095|text|首先，确保您处于Java透视图的"Package+Explorer“视图中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|773096|其次，需要将其设置为源文件夹。|773097|如果您在Java项目中，右键单击该文件夹并选择"Build+Path“>+"Use+as+Source+Folder”|773098|如下所示：|773099|注意到我在Java透视图中，可以看到文件夹"source“和"src”的样式在外观上有何不同。|773100|​|773101|📷|atomic|offset|length|773102|773103|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/eb0fba6e6566b1d2a0ca2274daef3d81.png|imageAlt^0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|13|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|16|8|@]|9|@$O|17|P|18|1|19]]|A|$]]|$1|Q|3|K|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y|Z|-4]]]]

First, ensure that you're in the "Package Explorer" view of the Java Perspective.

Secondly, it needs to be made a Source Folder.

If you're in the Java Project, right click on the folder and select "Build Path" > "Use as Source Folder"

Something like what is shown here:

Observe that I am in Java perspective and see how the style of the folders "source" and "src" are different in appearance.

<img src="https://i.stack.imgur.com/OkfKw.png" alt="Eclipse Screenshot">

blocks|key|773138|text|转到属性中的javabuildpath，并从排除项中删除该文件夹|type|unstyled|depth|inlineStyleRanges|entityRanges|data|773139|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|$]]

go into your javabuildpath in properties and remove the folder from your Exclusions

blocks|key|773315|text|简单:您不在package+Explorer视图中(而是在Navigator视图中)如果不是上述情况，那么在项目下创建一个新包(停留在Package+Explorer视图中)并将这些类移动到新创建的包中。好了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|773316|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|$]]

SIMPLE
You are not in the Package Explorer View ( but in Navigator view) 
If not the above case, then create a new package under the project (staying in Package Explorer view) and move those classes to the newly created package.
DONE.

blocks|key|773193|text|只需切换到java透视图，在ide中(右上角->+java...)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|773194|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|$]]

Just switch to java perspective, in the ide (top right corner-> java...)

blocks|key|773169|text|我尝试过mvn+eclipse:eclipse，它起作用了。需要注意的是.project文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|773170|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 tried mvn eclipse:eclipse and it worked.
One to watch out is the .project file.

blocks|key|988609|text|在java构建路径->库->添加类文件夹中添加包后，我也遇到了完全相同的问题……|type|unstyled|depth|inlineStyleRanges|entityRanges|data|988610|不要问我为什么要这样做%5E%5E，但要解决这个问题，我只需转到项目->属性->java构建路径->源代码|988611|它就在被排除的部分。只需将其从排除模式中删除，也可以从库部分中删除。|988612|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|$]]

i had the exact same Problem after i added the packege in java build path -> libraries -> add class folder...

Dont ask why i did this ^^ but to resolve the Problem i just had to go to Project->Properties->java build path->Source

And there it was in the Excluded part. Just remove it from the exclusion pattern and perhaps also from the libraries section.

blocks|key|773370|text|这种问题是由于web应用程序中缺少java和test文件夹而导致的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|773371|解决方案是：|773372|右键单击项目文件夹->属性和java构建路径，然后排序并导出，然后选择java和->文件夹，然后添加或应用->确定|773373|然后，您应该能够将包添加到java文件夹中。|773374|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

This kind of issue occur due to missing of java and test folder in the web application 

solution is :

Right click on the project folder -> properties -> java build path -> order and export and select the java and test folder and add or apply -> ok

then you should able to add the package in the java folder

blocks|key|773467|text|不需要删除，重新创建等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|773468|只需修改.classpath文件|773469|<classpath>
<classpathentry+kind="src"+output="target/classes"+path="src/main/java">
++++<attributes>
+++++........|code-block|syntax|javascript|773470|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

No Need of delete, re-create etc.

Just modify .classpath file

<pre><code>&lt;classpath&gt;
&lt;classpathentry kind="src" output="target/classes" path="src/main/java"&gt;
 &lt;attributes&gt;
 ........
</code></pre>

blocks|key|988573|text|创建包将改为创建一个较旧的包。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|988574|我也有同样的问题，但我不能解决它。但我建议，这是一种可能性。在包和任何文件之间复制和移动类之后，可能是类路径具有不同的信息，并且它没有更新。|988575|在阅读了上面的一些评论后，我现在只使用源文件夹，而不是标准的源文件夹"src“。在任何新的源文件夹中插入包总是运行的。|988576|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|$]]

Creating a package makes an older one instead.

I had the same problem, and I was not able to solve it. But I suggest this, as a possibility. After copying and moving classes between packages, any file, it could be that the classpath has different information and that it hasn't been updated. 

After having read some comments above, I now am only using source folders instead the standard source Folder "src". Inserting packages in any new source folder always runs.

blocks|key|773439|text|从菜单栏中，选择导航>+Show+In+>+Package+Explorer。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|773440|这就是对我有效的方法。|773441|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

From the menu bar, select Navigate > Show In > Package Explorer. 

This is what worked for me.

blocks|key|988814|text|我在一个maven项目上做了这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|988815|如果它是一个MAVEN项目，而这是一个新的模块，你必须将该模块作为maven项目导入，它就会工作。|988816|右键单击-导入->现有Maven模块...|988817|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|$]]

I had this on a maven project.
If it's a MAVEN project and this is a new module, you have to Import the module as maven project and it will work.
Right click -Import-&gt;Existing Maven Module...

My Eclipse Java package is treated as a folder; can anyone suggest what's wrong?

Why is my Eclipse Java package being treated as a folder?

Eclipse

Java

我的Eclipse Java包被视为一个文件夹；有人能指出哪里出了问题吗？

问为什么我的Eclipse Java包被视为文件夹？
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