Java newbie

[Jerry Lapham]

I'm brand new to running java programs and Superbcalc looks just what I've 
been looking for - a non-scientific calculator with a "tape."  I can't get it 
to run, so I sent the following to the author:

SuperbCalc looks like just the application I've been looking for.  
Unfortunately, when I try to run it I get

jerry at JERRY-HP:~/Downloads$ java superbcalc.jar
Exception in thread "main" java.lang.NoClassDefFoundError: superbcalc/jar
Caused by: java.lang.ClassNotFoundException: superbcalc.jar
        at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: superbcalc.jar. Program will exit.

Is there something I'm missing?  I'm running Kubuntu 10.04 Linux.

        -Jerry

It's been over a month with no response.  Anyone here a java expert who could 
tell me what the error messages mean?

	-Jerry
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Jerry Lapham
Monroe, OH  45050
rjlapham at gmail.com
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If there appears to be a problem, appear to solve it.