jar on double clicking?

hello friend
I able to create a jar file in java as guidance provided by 'dirk'(thank u dirk). i can execute it in command line but find nothing on 'double click'(no error message). suggestions are welcome.
thank u

does your app run from command line or else has graphical interface?
because if the first is true then you'll see nothing, as a matter of a fact

thank u miguel for ur response.
I tried with two programs, one is about invoking a 'frame' and other is simple one carries 'System.out.println("...");'. both are working with
the command as follows.

>java -jar mainclass.txt jarfile.jar
suggestions are welcome.

Assumed you're running a kinda windows.
There is a MenuOption in Explorer 'Datatypes'.
Here you have to tell Windows, what you want to do, by hitting enter on a 'jar'-File.
Describe '.jar'-extension as Java-Archive, and define the program to execute, someting similar to 'java -jar %*%'.
Have a look at other entrys like 'html' 'doc' etc., to find out about the details.

sorry...
I cannot understand what do u say,Stefan.plz help me to understand.
thank u.

see this link ,
http://www.cis.upenn.edu/~matuszek/cit597-2002/Pages/executable-jar-files.html
Follow paragraph titled , "To make jar files executable (Windows 98): ".

bala,
Your likely problem is that your operating system isn't properly configured to run a JAR file when double-clicking on it.
If it helps, my settings for this file type are as follows.
"D:\Program Files\Java\j2re1.4.2_03\bin\javaw.exe" -jar "%1" %*
If you need help on configuring your system to handle files with the .jar extension differently, just ask.