Console will not "run"

Everytime I try to run my *.java file in the console I
get this message:

> java -classpath $d $n
java.lang.NoClassDefFoundError: Kverw (wrong name:
swe2/uebung3/Kverw)

But this file does exist.
When I type in the correct path by myself it works but
only until an input is needed:

Kontoverwaltung bitte waehlen sie:
1. Neues Konto erstellen
2. Konto loeschen
3. Einzahlen
4. Abheben
5. Kreditrahmen aendern
6. Transaktionen anzeigen
7. Alle Konten anzeigen
8. Speichern
9. Laden
0. Abbruch
> 2
Process java swe2/uebung3/Kverw killed
Process java swe2/uebung3/Kverw exited with code 1
I/O error: CreateProcess: 2 error=0

What do I wrong ???