“无法找到或加载主类"使用 cmd 提示符运行 java 程序时出错

问题描述

我正在运行一个简单的HelloWorld"程序.我在命令提示符中收到此错误:

I am running a simple "HelloWorld" Program. I get this error in the command prompt:

无法找到或加载主类HelloWorld.

我已经在系统中设置了 CLASSPATH 和 PATH 变量.在 cmd 提示符下，我从保存 HelloWorld 程序的目录运行.我可以看到类名和文件名相同，并且在同一目录中创建了 .class 文件.还有什么问题?

I have set the CLASSPATH and PATH variable in the system. In the cmd prompt, I am running from the directory where I have saved HelloWorld program. I can see the class name and the file name are same and also .class file created in the same directory. What else could be the problem?

我的示例程序如下所示:

My sample program looks like this:

package org.tij.exercises;
public class HelloWorld {
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    System.out.println("Hello World!!");
  }
}

推荐答案

当 Main 类在包中时，您需要按如下方式运行它:

When the Main class is inside a package then you need to run it as follows :

java <packageName>.<MainClassName>

在您的情况下，您应该按如下方式运行程序:

In your case you should run the program as follows :

java org.tij.exercises.HelloWorld 

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