executing the program in subpackage

I have created a java program and prevented the class file to be saved in package where source file is saved say pracjava by using these steps:

include the package abc like that
package abc; in program

and then compling the prog in this way
e:\pracjava\javac -d . prog.java

this creating class file inside abc package which is inside pracjava package

but when i am executing program using
e:\pracjava\java prog
then it is not running
giving error no classdef found error

i have set path to c:\jdk1.5\bin
and classpath to e:\pracjava


however when compling the program using
e:\pracjava\javac prog.java

and then executing it. It is not giving any error

 

The filename has to be the same as the class/package name, like if your classname is ABC, the filename has to be ABC.java!

 

name of class file is prog not abc. abc name of subpackage that created by command

javac -d . prog.java