今天突然发现这个有关问题，自己解决不了，求大侠看看

今天突然发现这个问题，自己解决不了，求大侠看看！
以前都是用myeclipse来写程序代码，程序都运行正常，今天突然用cmd来运行以前的程序？出现一下错误，求大侠帮忙看看》

Java code

 E:\WorkSpace\java\src\com\java\string>java StringBufferTest                           Exception in thread "main" java.lang.NoClassDefFoundError: StringBufferTest (wro                           ng name: com/java/string/StringBufferTest)                                   at java.lang.ClassLoader.defineClass1(Native Method)                                   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$100(Unknown Source)                                   at java.net.URLClassLoader$1.run(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)                                   at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

[解决办法]
麻烦你在E:\WorkSpace\java\src这个目录下，尝试执行：

java -cp . com.java.string.StringBufferTest

就是：
E:\WorkSpace\java\src>java -cp . com.java.string.StringBufferTest


看看结果