Java命令行找不到或加载主类 [英] Java command line could not find or load main class

问题描述

我一直试图从命令行运行任何.class文件，但我一直收到此错误.在整夜试图解决问题之后，我正式陷入了困境.

I have been trying to run any .class file from the command line, and I keep getting this error. After trying to figure out the problem on my own all night, i'm officially stumped.

我在Linux上，通常使用eclipse，因此我的.java文件和.class文件位于两个不同的位置.

I'm on linux, and I use eclipse usually so my .java file and .class file are in two different locations.

这里的类路径....

%> echo $CLASSPATH
/home/mike/Documents/java

这里是我的.class目录之一...

Heres one of my .class directories...

/home/mike/Documents/java/homework/bin/src

在此对应的.java目录...

Heres the corresponding .java directory...

/home/mike/Documents/java/homework/src/src

这里是我在bash中输入的内容...

Heres what I enter in bash...

[ mike (23:31:16): ~] $ >java homework.bin.src.EulerMath

OR

[ mike (23:32:41): ~/Documents/java] $ >java -cp . homework.bin.src.EulerMath

OR

[ mike (23:34:08): ~/Documents/java/homework/bin/src] $ >java -cp . EulerMath

所有人都给我同样的错误.显然，我正在尝试运行src包中的EulerMath.class.这可以在eclipse中编译并正常运行，而我尝试从命令行运行的所有其他程序也存在类似的问题.我可以使用javac编译.java文件，但是尝试运行新的.class文件时出现此错误.非常感谢您的帮助

All give me the same error. Obviously im trying to run EulerMath.class, which is within the package src. This compiles and runs fine within eclipse, and I have a similar issue with every other program i try to run from the command line. I can compile the .java file with javac but when trying to run the new .class file i get this error. Id appreciate any help

推荐答案

修改您的 CLASSPATH 之类的

export CLASSPATH="$HOME/Documents/java/homework/bin"

然后您就可以运行它，而无需像

这样的 -cp 命令行

then you can run it without a -cp command line like

java src.EulerMath

无需设置 CLASSPATH (或者如果要覆盖设置的 CLASSPATH )，则可以

Without setting the CLASSPATH (or if you want to override the set CLASSPATH) you can do

java -cp $HOME/Documents/java/homework/bin src.EulerMath

但是 src.EulerMath 是您的类的名称.或者，您可以将其打包为带有一些元信息的jar文件(基本上是 Main-Class )，然后使用 java -jar< jarfile.jar>

But src.EulerMath is the name of your class. Alternatively, you can package it in a jar file with some meta-information (basically a Main-Class) and run it with java -jar <jarfile.jar>

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