How to run java jar file

Hello,
I got a java jar file which contains folders with
class file. When I double click on the jar file, it
gave a error
Exception in thread "main"
java.lang.NoClassDefFoundError
How can I run this jar file?
Thanks,
CR... and assuming that Jar contains a manifest file, what does it look like? I would guess that the Main-Class entry is incorrect, or that the Jar has external dependencies to other jars not listed properly in the Class-Path entry.

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Hi, i have created an applet that works with 2 or 3
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