how to create executable jar?

I have created an applet code and the file name is app.java
I want to create a ikon, so that on clicking that ikon my applet should starts to work.
any one can help me in this reg.

use innosetup software to create the executable setup file.

1)place all the class files in a folder and place a manifest file in that folder specifying the main class to execute first.
2)place one bmp or gif file that to be viewed after installation.
3)create a jar file in cmd prompt like:
jar -cvfm name.jar META-INF\manifest.mf .
4)this jar file is to be created in that folder only,
after that use this jar file and bmp file in the innosetup tool and make the setup file that s all.

hi sasi,
thanks for your valuable information. i'll try this and let you know the status later.