Java 错误：包“x”不存在

Java error: package 'x' does not exist

提问by Jerfov2

So I have a file tree in Linux that looks like this:

所以我在 Linux 中有一个文件树，看起来像这样：

• ~/keyboard_warriors/
  
  • test/
    
    • ConfigTest.java
  • ConfigParser.class
  • ConfigParser.java

• ~/keyboard_warriors/
  
  • 测试/
    
    • 配置测试文件
  • ConfigParser.class
  • 配置解析器

The problem is that when I try to type in Terminal:
javac ConfigTest.java

问题是当我尝试在终端中输入时：
javac ConfigTest.java

I get the error:

我收到错误：

ConfigTest.java:2: error: package keyboard_warriors does not exist  
import keyboard_warriors.*;  
^

This is really bugging me and I could not find any answers anywhere. If you could solve my problem, I would be a very happy person.

这真的让我烦恼，我在任何地方都找不到任何答案。如果你能解决我的问题，我会很高兴的。

采纳答案by Jerfov2

I figured out the answer a long time ago but forgot to post it. sorry :). It is actually quite simple. I was trying to compile the classes from inside the test/folder. What I did was go up to where all the classes were accessible without having to use a absolute path and without using ../in the path (AKA the keyboard_warriors/folder. I just compile from there and everything was A-OK. Thanks for the input though, it did help some ;).

我很久以前就想出了答案，但忘记发布了。对不起 ：）。其实很简单。我试图从test/文件夹内部编译类。我所做的是转到所有类都可以访问的地方，而无需使用绝对路径，也无需../在路径中使用（也就是keyboard_warriors/文件夹。我只是从那里编译，一切都很好。不过感谢您的输入，它确实有帮助；)。

回答by Makoto

It's not going to recognize a directory outside of the classpath as being part of the classpath.

它不会将类路径之外的目录识别为类路径的一部分。

What you probably want is to include another folder inside of where your test is being run:

您可能想要的是在运行测试的地方包含另一个文件夹：

test/
    keyboard_warriors/
        ConfigTest.java
        ConfigParser.java

This also presumes that you have declared these classes to be in the keyboard_warriorsclasspath, by this:

这还假定您已通过以下方式将这些类声明在keyboard_warriors类路径中：

package keyboard_warriors;

Depending on how you're compiling these classes, you'd have to add it to the classpath with the -cpflag on javac.

根据您编译这些类的方式，您必须将其添加到带有-cp标志的类路径中javac。

回答by T.J. Crowder

Given the structure you've quoted, it would be odd to be importing keyboard_warriorsinto ConfigTest; from the structure, you'd expect to see package keyboard_warriors;instead, because ConfigTestis in the keyboard_warriorsdirectory.

鉴于您引用的结构，导入keyboard_warriors到ConfigTest;会很奇怪；从结构中，您希望看到的是package keyboard_warriors;，因为ConfigTest在keyboard_warriors目录中。

If ConfigTestisn'tin the keyboard_warriorspackage, it's probably in the wrong directory.

如果ConfigTest不是在keyboard_warriors包装，它可能是在错误的目录。

In general: When you're compiling classes, the .javafile should be in a directory named for the package it's in. So for instance, if ConfigTestis meant to be in the package, you'd keep your directory/file structure as it is and use

一般而言：当您编译类时，.java文件应位于以其所在包命名的目录中。因此，例如，如果ConfigTest打算在包中，则应保持目录/文件结构不变，并且利用

package keyboard_warriors;

...in ConfigTest.java.

...在ConfigTest.java.

If ConfigTestisn'tmeant to be in that package, you'd probably move it out of that directory; perhaps:

如果ConfigTest不打算在该包中，您可能会将其移出该目录；也许：

• ~/keyboard_warriors/
  • test/
    • ConfigTest.java
• ConfigParser.class
• ConfigParser.java

• ~/keyboard_warriors/
  • 测试/
    • 配置测试文件
• ConfigParser.class
• 配置解析器

...and then import keyboard_warriors.*;would make sense, provided that your home directory is in your classpath.

...然后import keyboard_warriors.*;就有意义了，前提是您的主目录在您的类路径中。