Running class inside package in java from Cmd?

[Hamzah khammash]

Hello
i have a class called Hamzah inside a package called hamzah i tried to run it from Command line but always i have NoClassDefFoundError the class compiled correctly and .class file produced but it didn't run
i try to do the following :


<C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\com\hamzah>javac Hamzah.java>


Compiled successfully

and this for run :

C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\com\hamzah>java -cp . Hamzah


Error here .

[John Jai]

Might help you - http://www.coderanch.com/t/562879/java/java/Help-Package-understanding

[Sagar Dabas]

do this ....

1. For compiling go into the folder where you java file is :
==> C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\com\hamzah>javac Hamzah.java>

2. Then come out all of your packages :
==> C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\com\hamzah>cd..

3. Then use fully qualified name to run your class.
C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\com>java hamzah.Hamzah

This is the method which I found, please somebody explain why do we have to do this. Does compiler don't know about packages whereas JVM know ?

[Hamzah khammash]

Sagar Dabas wrote:do this ....

1. For compiling go into the folder where you java file is :
==> C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\com\hamzah>javac Hamzah.java>

2. Then come out all of your packages :
==> C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\com\hamzah>cd..

3. Then use fully qualified name to run your class.
C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\com>java hamzah.Hamzah

This is the method which I found, please somebody explain why do we have to do this. Does compiler don't know about packages whereas JVM know ?

I found a solution for this
C:\Users\h.khammash\Desktop\Studening workspace\TestCmd\src\>java -cp . com.hamzah.Hamzah
-cp must be exist to run.