Problem when working with package???Please, help me!!!

I got 3 .java files from one Java tutorial as follow:
Server.java (in package mygame.server)
Utilities.java (in package mygame.shared)
Client.java (in package mygame.client)
All the above files are placed in "E:\Java Programmes\source"
After compiling, i got correspponding .class files:
Server.class (placed in "E:\Java Programmes\class\mygame\server")
Utilities.class (placed in "E:\Java Programmes\class\mygam\shared")
Clients.class (placed in "E:\Java Programmes\class\mygame\client")
But when i run Server.class which contains main method, i got error as follow:
E:\Java Programmes>java class\mygame\server\Server
Exception in thread "main" java.lang.NoClassDefFoundError: class\mygame\server\S
erver (wrong name: mygame/server/Server)
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$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
That was very puzzled for me. I cannot find out what wrong with my files. Please., any boby, help me!!! I always got this problem when working with package and managing files. Thanls a lot.

java -cp "E:\Java Programmes\class" mygame.server.Server

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