Can Someone Help?

I am currently in a data sturtures class(for java) at the college I attend. However, we have not covered a similar situation in any of the classes i have taken.
I have a program that requires you to type in a Username and Password everytime the program is opened. I would like to write a little program in java to supply the Username and Password to the program when the program is opened. My question: How do I get the progrgam needing the Username and Password to open the file I have written? Or should the program I have written call the executable of the program that needs the Username and Password? I have never written something like this and could use any help offered.

Thanks

I think you'll easily be able to store the information in a flat file --> a .properties file and have your program read in the information.
You can find more information about .properties in this thread:
Help with Properties file
And in the API for java.util.Properties