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)