Java错误 - 错误的源文件：文件不包含类x。请删除或确保它出现 [英] Java error - bad source file: file does not contain class x . Please remove or make sure it appears

问题描述

最近开始学习Java考试。

Recently started studying Java for an exam.

在学习软件包时，尝试了这个并收到错误消息。我做的是，

While learning packages, tried this and got an error message. What I did was,

//Creating class A (Within package the package: com.test.helpers)

package com.test.helpers;
public class A {
    public void sayHello(){
        System.out.println("Hello World");
    }
}

---

---

//And then the class App utilizing the class A

import com.test.helpers.*;

public class App{
    public static void main(String args[]){
        A a = new A();
        a.sayHello();
    }
}

---

我将这两个文件放在名为'JavaTest'的目录中（在Windows 7上），
并首先使用命令javac -d.A.java编译A.java

---

I had both of these files in a directory called 'JavaTest' (on Windows 7), and first compiled the A.java using the command "javac -d . A.java"

然后，在尝试编译App.java时，我收到以下错误消息：

And then, while attempting to compile App.java, I got the following error message:

App.java:5: error: cannot access A
                A a = new A();
                ^
  bad source file: .\A.java
    file does not contain class A
    Please remove or make sure it appears in the correct subdirectory of the source path.
1 error

---

然而，问题似乎以两种方式解决，

---

However, the problem seems to resolve in two ways,

1. 删除源文件A.java


2. 更改导入声明从'import com.test.helpers。*;'到
   'import com.test.helpers.A'在文件'App.java'中。

如果您能解释这里发生的事情，我将非常感激。或者我可能会犯一个愚蠢的人为错误或语法错误。

I'd be highly grateful if you can explain what happens here. Or I might be making a goofy human mistake or a syntax error.

这是指向来源的链接文件

非常感谢

推荐答案

移动文件夹JavaTest下的A.java到com / test / helpers。您看到的错误是编译器抱怨A.java位于与其包声明不匹配的文件夹中。请记住，如果没有A在一个包中，你就无法从App访问A.

move the A.java under folder JavaTest to com/test/helpers. the error you are seeing is for the compiler complaining that A.java is in a folder that does not match its package declaration. Remember, you cannot access A from App without A being in a package.

从src driectory下运行以下命令来编译你的类

from under src driectory run the following command to compile your classes

src> javac ./*.java ./com/test/helpers/*.java

然后从src下文件夹

src>java App

应该运行你的程序。

这篇关于Java错误 - 错误的源文件：文件不包含类x。请删除或确保它出现的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！