线程“main”中的异常 java.lang.ClassNotFoundException：
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Exception in thread "main" java.lang.ClassNotFoundException:
提问by kayanushpatel
I recently installed intellij IDEA 14.0 and to make sure everything was working I created a simple Hello World program. I do not understand why the output is not correct and why I am getting this error. If someone could please help that would be great.
我最近安装了 intellij IDEA 14.0 并确保一切正常，我创建了一个简单的 Hello World 程序。我不明白为什么输出不正确以及为什么我会收到此错误。如果有人可以请帮助那就太好了。
This is the program:
这是程序：
public class Hello {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
This is the error:
这是错误：
Exception in thread "main" java.lang.ClassNotFoundException: Hello
at java.net.URLClassLoader.run(URLClassLoader.java:372)
at java.net.URLClassLoader.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:260)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:116)
回答by alfasin
The reason you're getting this error is because you didn't save the class into a file called Hello.java(case-sensitive!)
您收到此错误的原因是您没有将类保存到名为Hello.java（区分大小写！）的文件中
回答by ankit
This is just problem of intellij IDE.
这只是intellij IDE的问题。
Solution Steps:
解决步骤：
- CtrlShiftAlts-> Preject Setting-> modules tab-> expand
<project_name>and go to<project_name>_main - refer Image:
- In Sources tab-> ** click on x symbol**
- CtrlShiftAlts->项目设置->模块选项卡->展开
<project_name>并转到<project_name>_main - 参考图片：
- 在 Sources 选项卡中-> ** 点击 x 符号**
- click YES
- Right click on -> sources
- Apply and OK
- 单击是
- 右键单击->来源
- 申请并确定
Finally build your project.
最后构建你的项目。
Enjoy.
享受。
回答by dmarquina
It usually happens with IntelliJ.
它通常发生在 IntelliJ 上。
I solved it deleting all modules and only leaving which have more hierarchy
我解决了它删除所有模块并只留下具有更多层次结构的模块
The other modules(like main or test) are already part of product
其他模块（如 main 或 test）已经是产品的一部分
