hello,

  i have the ByteTest.java file located on my harddrive at
C:\javasrc\wrox\ByteTest.java . i compiled the program and i received a class file at this same location. but when i run
the command java javasrc\wrox\ByteTest i get the error message:

Exception in thread "main" java.lang.NoClassDefFoundError: wrox\ByteTest (wrong
name: ByteTest)
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknow n Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)

i have tried other java programs at this same location and they run fine. i hava also tried putting in -cp -ea but i am a little unfamiliar with these. it looked like
java -cp -ea . javasrc\wrox\ByteTest
also tried
java -cp -ea . javasrc.wrox.ByteTest

just can not get this to work

thanks for the help
craig

i found the answer
1) i needed to declare a package in the first line:
package wrox;

2) also when i compile this code i can use either the dot(.) or this
slash(/) but this one does not work (\). so it would like

c:\javasrc>java wrox.ByteTest

         or

c:\javasrc>java wrox/ByteTest