blocks|key|1506850|text|我在使用Eclipse和Scala时经常遇到这个问题。如果您清理您的工作区并重建您的项目，这将有所帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1506851|有时Eclipse无法正确识别需要重新编译的文件:(|1506852|编辑:代码在Eclipse中运行良好|1506853|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 have this problem a lot with Eclipse and Scala. It helps if you clean your workspace and rebuild your Project.

Sometimes Eclipse doesn't recognize correctly which files it has to recompile :(

Edit:
The Code runs fine in Eclipse

blocks|key|1507119|text|在Eclipse中，确保将源文件夹添加到项目属性->+java+build+path+->+source中。否则，main()函数可能不会包含在项目中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507120|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|$]]

In Eclipse, make sure you add your source folder in the project properties -> java build path -> source. Otherwise, the main() function may not be included in your project.

blocks|key|1506938|text|更简单的方法是关闭项目，然后重新打开它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1506939|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|$]]

A simpler way is to close the project and reopen it.

blocks|key|1292775|text|只需确保您使用的文件夹已添加到构建的路径中：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1292776|right-click+your+folder+-->+build+Path+-->+Use+as+source+Folder|offset|length|style|CODE|1292777|现在，它应该在其中找到main。|1292778|entityMap^0|0|0|B|S|A|17|K|0|B|4|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|K|$]]

Just make sure that the folder you work in is added to the built path:

<code>right-click</code> your folder --> <code>build Path</code> --> <code>Use as source Folder</code>

and it should now find <code>main</code> therein.

blocks|key|1507710|text|您可以尝试从eclipse的大纲侧栏运行main函数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507711|​|1507712|📷|atomic|offset|length|1507713|1507714|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/17064f8dae54717fa5d3c5b153e77bb6.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

You can try to run the main function from the outline side bar of eclipse.
<img src="https://i.stack.imgur.com/uVuL9.png" alt="solution" />

blocks|key|1507012|text|您应该做的是，创建一个Java项目，但确保将此文件放入该项目的包文件中，否则您将遇到相同的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507013|​|1507014|📷|atomic|offset|length|1507015|1507016|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a0ce5a1a8f5a0220c4a5c8a67dcfd046.jpeg|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

What you should do is, create a Java Project, but make sure you put this file in the package file of that project, otherwise you'll encounter same error.

<img src="https://i.stack.imgur.com/Dw5Uk.jpg" alt="enter image description here">

blocks|key|1507073|text|一个快速的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507074|首先，排除包:右键单击源包>>构建路径>>+exclude|1507075|然后重新包含它:右键单击源包>>+Build+Path+>>+include|1507076|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|$]]

A quick solution: 

First, exclude the package:
Right click on the source package >> Build Path >> Exclude

Then include it back:
Right click on the source package >> Build Path >> Include

blocks|key|1292218|text|这个代码是有效的。您是否尝试过使用scalac手动编译它？还有，你有没有把你的文件叫做"addressbook"，全是小写的，就像对象的名字一样？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1292219|另外，我发现由于某种原因，Eclipse将主类设置为".addressbook“而不是"addressbook”。|1292220|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|$]]

That code is valid. Have you tried to compile it by hand using scalac? Also, have you called your file "addressbook", all lowercase, like the name of the object?

Also, I found that Eclipse, for some reason, set the main class to be ".addressbook" instead of "addressbook".

blocks|key|1507229|text|您应该通过以下方式创建文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507230|选择右侧，您将找到您的文件名。|1507231|在下面会找到src文件夹，您可以右键单击select+-->class+option|1507232|他们的你的文件应该被创建|1507233|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|$]]

you should create your file by 

selecting on right side you will find your file name,

under that will find src folder their you right click select -->class option

their your file should be created

blocks|key|1507552|text|确保您的.java文件存在于str包或其他包中。如果包含main函数的java文件在所有包之外，则会抛出此错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507553|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|$]]

Make sure that your .java file is present either in the str package, or in some other package. If the java file with the main function is outside all packages, this error is thrown.

blocks|key|1507992|text|也遇到过类似的问题，通过右键单击大纲视图中的main方法并作为Java应用程序运行来解决此问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507993|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|$]]

Have faced the similar issue, resolved this by right clicking on the main method in the outline view and run as Java application.

blocks|key|1506906|text|我也遇到了这个问题。解决方案是确保eclipse将项目创建为Java项目。只需创建一个新的Java项目并将您的类复制到src文件夹(并导入最终的依赖项)。这应该可以解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1506907|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 just had this problem too. The solution is to make sure eclipse created the project as Java project. Just create a new Java project and copy your class into the src folder (and import the eventual dependencies). This should fix the problem.

blocks|key|1507433|text|我在从文件系统导入的Java项目中遇到了这个问题(在Eclipse+Helios下)。这里有一个提示:+src代码似乎根本没有编译，因为没有显示"bin“目录。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507434|我必须从头开始创建一个Java项目(使用向导)，然后比较非工作项目和工作项目的.project文件。|offset|length|style|CODE|1507435|给出“编辑器不包含主类型”的项目在.project文件中将其作为"buildSpec“：|1507436|<buildSpec>
</buildSpec>|code-block|syntax|javascript|1507437|但是工作项目的“buildSpec”是这样的：|1507438|<buildSpec>
++++<buildCommand>
++++++++<name>org.eclipse.jdt.core.javabuilder</name>
++++++++<arguments>
++++++++</arguments>
++++</buildCommand>
</buildSpec>|1507439|我复制了这段代码，导入的项目正常工作。|1507440|我知道我的答案是Java，但同样的问题可能也适用于您的Scala项目。|1507441|entityMap^0|0|13|8|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|13|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|14|8|@]|9|@]|A|$]]|$1|Q|3|R|5|L|7|15|8|@]|9|@]|A|$M|N]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|17|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

I had this problem with a Java project that I imported from the file system (under Eclipse Helios). Here's a hint: the src code didn't seem to be compiled at all, as no "bin" directory showed up.

I had to create a Java project from scratch (using the wizard), then compare the <code>.project</code> files of the non-working and working projects.

The project giving "Editor does not contain a main type" had this as the "buildSpec" in the .project file:

<pre><code>&lt;buildSpec&gt;
&lt;/buildSpec&gt;
</code></pre>

But the working project had this as the "buildSpec":

<pre><code>&lt;buildSpec&gt;
 &lt;buildCommand&gt;
 &lt;name&gt;org.eclipse.jdt.core.javabuilder&lt;/name&gt;
 &lt;arguments&gt;
 &lt;/arguments&gt;
 &lt;/buildCommand&gt;
&lt;/buildSpec&gt;
</code></pre>

I copied this in, and the imported project worked.

I know my answer is for Java, but the same might be the issue for your Scala project.

blocks|key|1507499|text|您创建的文件可能在src(源)文件夹之外。尝试从源文件夹外部的.java文件调用类对象(从位于src文件夹中的文件)会导致相同的错误。将.java文件复制到源文件夹，然后构建它。错误将会消失。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507500|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|$]]

May be the file you have created is outside the src(source) folder. Trying to call the class object(from the file located in the src folder) from the .java file outside the source folder results in the same error. Copy .java file to the source folder, then build it. The error will be gone.

blocks|key|1293212|text|我也有同样的问题。我将主类从src包中取出，放在了其他文件夹中。我把它移到正确的文件夹中，解决了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1293213|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 had the same problem. I had the main class out of the src package, in other folder. I move it in and correct folder and solved

blocks|key|1507858|text|从命令行运行"eclipse+-clean+-refresh“。当所有其他解决方案都失败时，这为我解决了问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507859|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|$]]

run "eclipse -clean -refresh" from command line. This fixed the issue for me when all other solutions failed.

blocks|key|1293368|text|如果是maven项目，请检查是否在src/main/java下创建了java文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1293369|如果没有，请更改JRE路径并在上面的文件夹结构中创建java文件|1293370|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|$]]

If it is maven project please check the java file is created under src/main/java

If you are not getting please change the JRE path and create the java files in above folder structure

blocks|key|1507149|text|对于我来说，在Eclipse3.6中，当我的main方法不是公共的时候，就会出现这个问题。我有一个像这样的main方法导致了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507150|static+void+main(String[]+args)+|code-block|syntax|javascript|1507151|dubugger本身无法检测到这一点。我对Eclipse忽略了这一点感到非常惊讶。|1507152|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

For me, in Eclipse 3.6, this problem occurs when my main method is not public. I caused the problem by having a main method like this:

<pre><code>static void main(String[] args) 
</code></pre>

The dubugger was unable to detect this by itself. I am pretty suprised Eclipse overlooked this.

blocks|key|1292698|text|在最坏的情况下-使用从头开始的所有导入再次创建项目。在我的例子中，其他选项都不起作用。这种类型的错误提示项目设置中存在错误。我曾经设法解决过这个问题，但一旦做了进一步的开发，错误又回来了。从头开始重新创建一切帮助我理解和优化了一些链接，现在我相信它可以正常工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1292699|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|$]]

In the worst case - create the project once again with all the imports from the beginning. In my case none of the other options worked. This type of error hints that there is an error in the project settings. I once managed to solve it, but once further developments were done, the error came back. Recreating everything from the beginning helped me understand and optimize some links, and now I am confident it works correctly.

blocks|key|1292745|text|File+>>+Import+>>+Existing+Projects+into+Workspace+>>选择Archive+Filed+>>+Browse+and+locate+file+>>+Finish。如果它已经以其他方式导入，请删除它并尝试以其他方式导入。在我尝试之前，我也遇到了同样的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1292746|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|$]]

File >> Import >> Existing Projects into Workspace >> Select Archive Filed >> Browse and locate file >> Finish. If its already imported some other way delete it and try it that way. I was having the same problem until i tried that.

blocks|key|1507374|text|还有一件事需要检查:确保您的源文件包含与它所在的子目录相对应的正确包声明。当尝试运行在子目录中的文件中声明但缺少package语句的"main+type“时，可以看到OP提到的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507375|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|$]]

One more thing to check: make sure that your source file contains the correct package declaration corresponding to the subdirectory it's in. The error mentioned by the OP can be seen when trying to run a "main type" declared in a file in a subdirectory but missing the package statement.

blocks|key|1293059|text|在我更改了源文件夹之后，我也遇到了这个问题。有效的解决方案是编辑文件并保存它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1293060|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 have this problem too after I changed the source folder. The solution that worked for is just editing the file and save it.

blocks|key|1293244|text|尝试“更新项目”。一旦我这样做了，就会出现Run+as+Java+Application选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1293245|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|$]]

Try 'Update Project'. Once I did this, The Run as Java Application option appeared.

blocks|key|1507904|text|关于错误的原因："Editor不包含主类型“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1507905|在:+Eclipse+Neon中遇到错误|1507906|操作系统:+Windows+10专业版|1507907|当您从拇指驱动器复制源文件夹而忽略Eclipse_Projects.metadata文件夹时。|1507908|除了全新安装之外，您还必须确保合并来自(Thrumb-drive)F:Eclipse_Projects.metadata.plugins的文件。|1507909|这些插件是创建类时从SDK中提取的零碎库代码。我真的完全取决于你-导入javax.swing.*；-到你的文件中。因为您正在转移它，所以请确保将-Eclipse_Projects.metadata.plugins-手动与简单的复制和粘贴合并，同时接受文件夹中已经存在的插件的跳过功能。|1507910|对于windows10:你可以找到遵循类似文件层次结构模式的工作文件夹。|1507911|C:Users>Mikes+Laptop>工作区>+.metadata+>+.plugins+<-此处合并插件|1507912|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|W|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|Y|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|Q|$]]

On reason for an Error of: "Editor does not contain a main type"

Error encountered in: Eclipse Neon

Operating System: Windows 10 Pro

When you copy your source folders over from a thumb-drive and leave out the Eclipse_Projects.metadata folder. 

Other than a fresh install, you will have to make sure you merge the files from (Thrumb-drive)F:Eclipse_Projects.metadata.plugins . 

These plug-ins are the bits and pieces of library code taken from the SDK when a class is created. I really all depends on what you-----import javax.swing.*;----- into your file. Because your transferring it over make sure to merge the ------Eclipse_Projects.metadata.plugins------ manually with a simple copy and paste, while accepting the skip feature for already present plugins in your Folder.

For windows 10: you can find your working folders following a similar pattern of file hierarchy. 

C:Users>Mikes Laptop> workspace > .metadata > .plugins &lt;---merge plugins here

blocks|key|1507195|text|您需要在文件夹src中找到文件.java+(在Eclipse的Project+Explorer中)，然后它就会运行。我刚刚在项目中添加了一个文件.java，但它不在文件夹src中，所以我遇到了同样的错误。我再次将其放入src中，然后构建它。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1507196|entityMap^0|7|3|F|5|20|5|2D|3|31|3|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|G|$]]

You need locate file <code>.java</code> in folder <code>src</code> (in Project Explorer of Eclipse) and then it run.
I have just add a file <code>.java</code> into project and it isn't in folder <code>src</code>, so I have a same error.
I put again it into <code>src</code>, then it was build.

blocks|key|1508014|text|不是添加文件，而是添加类。File->New->Class.这解决了我的问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1508015|entityMap^0|D|4|J|3|O|5|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

Instead of adding File, add class. <code>File</code>-><code>New</code>-><code>Class</code>. That fixed my issue.

blocks|key|1293459|text|在类中添加一个main方法方法来解决这个问题。关于this.Now，我也面临着同样的问题，包括我代码中的main方法，我解决了我的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1293460|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|$]]

Add a main method method inside the class to overcome this problem. I was facing the same issue regarding this.Now Including the main method inside my code i resolved my problem.

Just going through the sample Scala code on Scala website, but encountered an annoying error when trying to run it.

Here's the code: <a href="http://www.scala-lang.org/node/45" rel="noreferrer">http://www.scala-lang.org/node/45</a>. On running it on Eclipse, I got this message 'Editor does not contain a main type' that prevents it from running.

Is there anything I need to do...i.e break that file into multiple files, or what?

Editor does not contain a main type

文件系统

Windows

Eclipse

Java

我在Scala网站上浏览了示例Scala代码，但在尝试运行它时遇到了一个恼人的错误。下面是代码：。在Eclipse上运行它时，我收到了这样的消息：“Editor不包含主类型”，这阻止了它的运行。有什么我需要做的吗?也就是说，把文件拆成多个文件，或者别的什么？

问编辑器不包含主类型
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