Re: recommendations to 'hold data'

Lew <>
Mon, 20 Apr 2009 10:24:00 -0700 (PDT)
On Apr 19, 12:14 pm, "Jeremy Watts" <> wrote:

"Knute Johnson" <> wrote in message


Jeremy Watts wrote:


I am working on a Java GUI that basically allows a user to carry out
various functions & operations associated with 'linear algebra' - so
matrix calculations,finding eigenvalues, solving systems of equations,
that sort of thing.

Now,at the moment I am working on the 'main' GUI window. It has var=


buttons on it, allowing the user to do amongst other things 'declare a
matrix'. Upon declaring a matrix, then another small GUI window ope=


allowing the user to enter his/her matrix details, this information th=


is then stored (after being parsed) in a 'String' array.

At various times, other classes are going to want access to this store=


information, and I have been wondering how to go about this. Is thi=


what Java Files are for? I've been trying to find out exactly what =


things are about but I'm having trouble cutting through the jargon...

Assumedly these things are 'files' that are accessible by anything...?=


that correct? Would you recommend using a 'File' to store the value=

s of

the matrices entered by the user?

Jeremy Watts

Two simple (and I really mean simpleton) criteria, does the data need t=


persist once the program is closed or is there so much data that you ca=


keep it in memory. Answer those questions and you'll know if you nee=

d to

write it to a file.

Upon closing the 'main' GUI window, then no the data does not need to the=


persist. As for the other smaller GUI window that pops up when the use=


wants to enter a matrix, then yes obviously it would need to persist upon
closing that window.

That is far from obvious, because the definition of "persist" in
computer programming terms is "serialize to storage that remains after
the program closes".


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