错误“未找到主类”
所有，
我的类路径已设置为以下文件夹：
CLASSPATH = .;C:\Program Files\Java\jdk1.6.0_21\bin;C:\Program Files\Java\jdk1.6.0_21\bin\project
我的所有java文件和类文件都在CLASSPATH中列出的project文件夹下。
然而，我在 project 文件夹中运行 DriverClass 时收到以下错误：
C:\Program Files\Java\jdk1.6.0_21\bin\project>java DriverClass
Exception in thread "main" java.lang.NoClassDefFoundError: DriverClass (wrong name: project/DriverClass)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: DriverClass. Program will exit.
任何人都可以帮我理解这里的原因吗？
All,
My classpath has been set to the following folder:
CLASSPATH = .;C:\Program Files\Java\jdk1.6.0_21\bin;C:\Program Files\Java\jdk1.6.0_21\bin\project
All my java files and class files are under project folder listed in CLASSPATH.
Yet I am getting the following error while running a DriverClass in project folder:
C:\Program Files\Java\jdk1.6.0_21\bin\project>java DriverClass
Exception in thread "main" java.lang.NoClassDefFoundError: DriverClass (wrong name: project/DriverClass)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: DriverClass. Program will exit.
Can anyone please help me understand the reason here?
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你在包裹里。您应该位于包根目录中。向上移动一个文件夹。
然后使用
java project.DriverClass重新执行它。也就是说，您应该不喜欢使用 CLASSPATH 环境变量。您的目前也无效。未加引号的路径名中有空格。此外，
JDK/bin文件夹不应该位于类路径中。只需使用-cp参数，例如java -cp 。 project.DriverClass（位于包根文件夹中）。You're inside the package. You should be sitting in the package root. Go one folder up.
Then reexecute it using
java project.DriverClass.That said, you should prefer not to use the
CLASSPATHenvironment variable. Yours is currently also invalid. There are spaces in unquoted pathnames. Also, theJDK/binfolder isn't supposed to go in the classpath. Just use the-cpargument likejava -cp . project.DriverClass(while sitting in the package root folder).尝试：
假设您的包是
projectTry:
assuming your package is
project编译后，如果我们收到主类未找到错误，很简单，试试这个
设置类路径=%classpath%;.;
在cmd中输入并运行它..问题将得到解决
After compiling if we get a main class not found error, It is simple try this
set classpath=%classpath%;.;
type this in cmd and run it..problem will be resolved