How do you execute a JAR file?

I'm sorry this is so basic, but I honestly do not know how to do this nor can I find anything online here or anywhere via Google to help me with this one.
I have a JAR file that I created on another machine using JDK 1.6.0 and NetBeans 5.5 on WinXP.
I copied and pasted that JAR file over to my machine at home also using JDK 1.6.0 and NetBeans 5.5 on WinXP
I put the exact directory name where the JAR file resides, "C:\Program Files\Java\jdk1.6.0\classes", in CLASSPATH and rebooted my machine.
However, upon CD'ing to that directory and doing "java -classpath . GUI.jar", I get a "NoClassDefFoundError" when trying to do so.
Furthermore, I was not sure how to use NetBeans to run the JAR file to execute the classes within.
What did I do wrong? I'm so sorry this is so basic.
Thanx
Phil

You are using netbeans to build your jar. Go to your project properties (right click on the project name and choose properties). Then select "Run" from the tree. You will find a text box "Main Class" there, put the name of the class in there that has your main() method, including full package if you have one. That is WITHOUT the .class extension.
Build your jar, it will be placed in the dist directory of your netbeans project. You can now run it from netbeans itself if you want. If ever you want to run the jar from the command line on your home machine, just navigate to the directory with the jar file and execute this:
java -jar yourjar.jarand you're off. If your runtime environment is propertly setup you can even execute the jar by simply double clicking on it from the windows explorer. No need to change the CLASSPATH variable at all, in fact it is ignored when executing a jarred application.
Also a note: you do not need to reboot your machine when you change an environment property. Simply change them using my computer -> properties -> advanced tab -> environmental variables. If you have any command prompts open, close and reopen them so the properties are updated properly.

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At the moment I am using Java NetBeans , and Easy Java( the java pad).
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801283 wrote:
how do you convert a jar file into a java file ?You generally don't. There exist decompilers, but if you're meant to have the source, you should either have it because you are the author, or you should be able to get it from the author.
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Edited by: GanMatt on Jun 18, 2009 8:18 AM
Edited by: GanMatt on Jun 18, 2009 8:19 AM

Alright, my question has changed. Here's the code:
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