由于构建路径不正确，Java / Scala导入无法正常工作？(Java / Scala import not working due to incorrect build path?)

编程入门行业动态更新时间:2024-10-26 14:38:36

我对你如何导入包及其类非常困惑。我有两个scala项目，具有以下目录结构：

project1/ src/ main/ scala/ utils/ some_file.scala worksheet/ learning.sc project2/ * seemingly the same as project 1 *

some_file.scala的内容：

package utils class InterestingClass { override def toString(): String = "I should be interesting" }

learning.sc的内容：

package worksheet import utils.InterestingClass object learning { println("Welcome to the Scala worksheet") //> Welcome to the Scala worksheet println(new InterestingClass()) //> I should be interesting }

当我创建project1/src/main/scala/ ，在Eclipse中我右键单击main.scala ，它显示为src下面的包并选中： Build Path > Use As Source Folder ，然后在Eclipse中“删除” src文件夹。 project2实际上是我作为在线课程的一部分下载的一个项目所以我想在.project文件或我需要调整的.settings文件夹中有一些配置，因为project1中的learning.sc自动编译并按预期生成两个输出包括I should be interesting但在project2它没有和行import utils.InterestingClass显示not found: object utils的错误not found: object utils 。

我想在构建路径中有一个微妙的不同，但我找不到它，错误信息不会让我更进一步。有关如何调试导入错误的任何提示？查看构建路径，它们看起来是正确的（都有project1/src/main/scala或project2/src/main/scala ）。

I'm very confused about how you import packages and their classes. I have two scala projects with the following directory structures:

project1/ src/ main/ scala/ utils/ some_file.scala worksheet/ learning.sc project2/ * seemingly the same as project 1 *

The contents of some_file.scala:

package utils class InterestingClass { override def toString(): String = "I should be interesting" }

The contents of learning.sc:

When I created project1/src/main/scala/, in Eclipse I right clicked main.scala that was showing as a package underneath src and selected: Build Path > Use As Source Folder, and in Eclipse then "deleted" the src folder. project2 is actually a project I have downloaded as part of an online course so I guess there's some config in the .project file or the .settings folder that I need to tweak because learning.sc in project1 auto compiles as expected and produces the two outputs including I should be interesting but in project2 it does not and the line import utils.InterestingClass shows the error not found: object utils.

I guess there's a subtle different in the build paths but I can't find it and the error message doesn't get me much further. Any tips on how to debug import errors? Looking at the build paths, they look correct (both have project1/src/main/scala or project2/src/main/scala).