[黑马程序员]命令行执行时碰到Exception in thread "main" java.lang.NoClassDefFoundError

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习惯了eclipse,今天用命令行的时候，碰到了如下错误：

D:\temp\itheima\itheima\bin\test\itheima>java test.itheima.UdpdemoException in thread "main" java.lang.NoClassDefFoundError: test/itheima/UdpdemoCaused by: java.lang.ClassNotFoundException: test.itheima.Udpdemo        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)        at java.security.AccessController.doPrivileged(Native Method)        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)Could not find the main class: test.itheima.Udpdemo.  Program will exit.

不是代码错误是路径和文件名错误，改正如下：

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