“错误：无法找到或加载主类My.class” [英] "Error: Could not find or load main class My.class"

问题描述

通过cmd.exe在Windows 7上使用Java SDK 1.7。直到几个小时前，一切正常工作，突然，我无法运行我编译的类文件，一贯地出现标题中的错误。

Im using Java SDK 1.7 on Windows 7 via cmd.exe . Up until a few hours ago everything was working correctly when suddenly I was unable to run my compiled class files, consistently presented with the error in the title.

我似乎是能够编译我的My.java文件，但我无法运行生成的类文件（My.class）。我经常给出错误错误：找不到或加载主类My.class。我试过这个与其他多个类文件，所有导致相同的问题。

I seem to be able to compile my My.java file however I am unable to run the resulting class file (My.class). I am constantly given the error "Error: Could not find or load main class My.class". I have tried this with multiple other class files all resulting in the same problem.

我的路径环境变量设置为C：\Program Files（x86）\Java\jdk1.7.0_05\bin想知道

My 'Path' environment variable is set to "C:\Program Files (x86)\Java\jdk1.7.0_05\bin" if you were wondering

我已经尝试重新安装，创建和设置类路径变量（没有运气），甚至直接使用java -cp。My.class命令。

I have tried reinstalling, creating and setting a classpath variable (no luck), and even directly using the "java -cp . My.class" command.

我已经试过这些帖子都没有，因此我发布的原因：

I have tried these posts all to no avail, hence why I'm posting:

错误：找不到或加载主类

错误：找不到或加载主类 - 新手

找不到或加载主类

Java 1.7.0_03错误：找不到或加载主类

如果它有什么不同，我的代码是：

If it makes any difference my code is :

import javax.swing.JOptionPane;

class My {
    public static void main(String[] args) {
       final double x = 3.2;
       int i = (int)x;
       double m = 0;
       if (x < 4) {
          String saySomething = JOptionPane.showInputDialog(i);
          System.out.println(saySomething);
        }
       else {
          String saySomething = JOptionPane.showInputDialog(i);
          System.out.println("Hello World");
        }
       while (m < 10) {
            System.out.print(" While Loop ");
            m++;
        };
       for (i=1; i < 10; i++) {
           System.out.println("For Loop");
        };

    }
}

推荐答案

您应该指定类名，而不是要加载的类的文件。区别是删除 .class 扩展名的简单问题。

You should specify the classname instead of the file of the class to load. The difference is a simple matter of removing the .class extension.

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