How to make file associations in my java apps

Question

I am making a Graph maker in Java. Just give x = 1,2,3,4,5 and corresponding y = f(x) and get the discreate graph.
The graph can then be saved as a file of extention .grf (say) on the hard disk, and can be opened in my graph maker software for editing, viewing e.t.c.
Now my problem is that I want that when I dubble click on a file xyz.grf my graph maker should open automatically with this file opened in it, like other applications on windows say Notepad - dubble click on xyz.txt it will automatically launch Notepade with this file.
In other way I want that any .grf file gets associated to my graf maker.
Please help me and tell me the way, how should I proceed and how can I do this.

Answer 1

aashishjava wrote:
Yes Yes Yes It is 99% what I wanted to have. Thanks a lot ....You're welcome.
But now I want some thing more,(hand to forehead) They always want more. ;)
(a) There is a splash screen in my app. but JNLP always show its own splash screen, ...Webstart splash screens work differently to those of plain Jar files (which is unfortunate). A webstart splash screen has to be not included in the Jar, but available as a separate resource. The splash is defined in the JNLP launch file. For further details see the [JNLP File Syntax|http://java.sun.com/j2se/1.4.2/docs/guide/jws/developersguide/syntax.html].
<quote>
The optional kind="splash" attribute may be used in an icon element to indicate that the image is to be used as a "splash" screen during the launch of an application. If the JNLP file does not contain an icon element with a kind="splash" attribute, but does contain another icon tag, Java Web Start will display a splash screen consisting of the image specified by the icon element on the left and the application's title and vendor on the right.
The first time an application is launched following the addition or modification of the icon element in the JNLP file, the old splash image will still be displayed. The new splash image will appear on the second and subsequent launches of the application.
</quote>
The 'ignored first time' is because the webstart client is more focused on getting the app. downloaded, cached and launched, than showing splashes. Once the app. is on-screen, it will download the splash in the background.
One other 'gotcha' of splash screens is that the JNLP file must define a href in the JNLP element for the splash to be used. The webstart client assumes that a JNLP with no href is dynamically generated, and will not be the same twice. Because of that it ignores the splash!
Edit 1:
Unfortunately, I do not have any direct examples of using splash screens A splash is usually on my 'To Do' list for projects, but it is a very low priority.
Edited by: AndrewThompson64 on Dec 10, 2009 11:35 AM