compilation - cannot run a simple java code -


i have downloaded java developers kit 64bit windows 7, wrote down code in notepad, though code compiling command prompt , creating .class file, refusing run showing error code:

java.lang.noclassdeffounderror: first caused by: java.lang.classnotfoundexception: first      @ java.net.urlclassloader$1.run(unknown source)      @ java.security.accesscontroller.doprivileged(native method)      @ java.net.urlclassloader.findclass(unknown source)      @ java.lang.classloader.loadclass(unknown source)      @ sun.misc.launcher$appclassloader.loadclass(unknown source)      @ java.lang.classloader.loadclass(unknown source)  not find main class: first.  program exit. exception in thread "main"

i have made sure more once file name , class name same(i have kept them smallcase 'a' sure). still no avail, please suggest few solutions please.. i'm new java i'm c/c++ programmer.

a java program has basic structure:

classname.java

public class classname {     public static void main(string[] args)     {      } }

try using outline generate code.

compile , run with:

javac classname.java java classname

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