Re: Create Graphical interface -- JAVA400-L

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James Perkins skrev den 11-02-2008 17:48:

Hello All,
I have a question that some what pertains to this thread. I myself am
learning Swing in order to make a nice GUI front end.

So, here is my question. How are you validating screen entries and getting
data to the screen? Do you have to write your own program to control this? I
would like to be able to throw a GUI over an already existing RPG program.

You should separate the GUI from the data structure holding the accepted data.

You load the data structure from e.g. a data record or a JDBC rowset. When you need to edit set each field in the GUI with the appropriate data from the data structure, and when the user accepts with Ok you run a validation on the fields to see if they are acceptable. If not you flag as appropriate, and do not accept the Ok. If ok, then you set the fields in the data structure from the GUI fields and go from there.

Do not let the GUI fields edit your data structure directly - eventually that will give you trouble.

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