(Swing) Reading fields from other forms - Best practice

Hi All,
I have been learning Java and Swing through NetBeans (quite a cool way to do it). I would like some 'best-practice' advice please. Google and search on this forum are normally my friends, can't find anything relevant for this though. I have created an application that seems to be functional, all my navigation is through tabs.
To make my app portable I have created a ?Settings? part. To save having another tab, I have basically copied the way NetBeans deals with opening the ?About Box? in its example, and have set-up fields in here. This essentially opens a JDialog with fields through an option in the menu.
I figure the best way to store the data is in a simple text file, and have the application read the values on start-up? Then when somebody changes the fields and saves it just overwrites the text file with the new values. I am not sure how to best read these in though, I can?t find a way of reading direct from the JDialog (i.e. var.getText()) which makes sense as the JDialog will be closed.
Will my best practice simply be writing a class which reads the file, then whenever I need a value just calling the class?
Thanks a lot

You should not be using preference files unless you really know what you are doing. This is one area of the very few areas of Java programming that can have lasting nasty negative affects on a computer that runs the code if done wrong.
If you want the user to save preferences it is better to just use xml. The advantage of preference files is they can be used by multiple programs and are permanent even after the program is done running/deleted/writen-over/forgotten. The disadvantages of preference files is they can be used by multiple programs, are permanent even after the program is done running/deleted/writen-over/forgotten, can cause damage to your OS, may be seen as harmfull by add blockers and/or anti-virus software, may lead to conflicts with other software that uses similar naming schemes, and are pretty much unportable.
You are going to be much better off in the long run learning XML and just saving them there, an added benefit of XML is if you screw something up and it causes your program to no longer run you can easily edit the xml by hand.
JSG

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(Swing) Reading fields from other forms - Best practice

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