How to pass data between 2 or more ACTIVATED JFrames?

Question

In C# this is done by using delegates and event, here is the link: Passing Data between Windows Forms.

My requirement is like this. User have to search the item code by loading the whole items from the database to a new form's JTable, this new form is shown by clicking a button in the main form (or any other form). After that appears, user Double click on specific item code in the table and that item code is passed to the main form's (or any other form's) text field and closed the current form.

here is the output from c# https://www.youtube.com/watch?v=_lPkc1YV2vQ&feature=youtu.be

See [The Use of Multiple JFrames, Good/Bad Practice?](http://stackoverflow.com/q/9554636/418556) — Andrew Thompson, Sep 02 '14 at 17:11
@AndrewThompson: to the OP's credit, this does appear to be a decent spot for a modal dialog. — Hovercraft Full Of Eels, Sep 02 '14 at 17:13
@HovercraftFullOfEels ..You almost wrote that like modal dialogs were not mentioned in the linked Q&A. — Andrew Thompson, Sep 02 '14 at 17:16
@AndrewThompson: I have to admit that it's been a while since I've read/re-read that link. It is a great one though and wish I could up-vote it many times, but alas, I don't live in Chicago any more. — Hovercraft Full Of Eels, Sep 02 '14 at 17:18
possible duplicate of [Passing values between JFrames](http://stackoverflow.com/questions/7017063/passing-values-between-jframes) — admdrew, Sep 02 '14 at 18:10

score 1 · Answer 1 · answered Sep 02 '14 at 17:12

1

The second window should not be a JFrame, but rather a JDialog, possibly modal. If it is modal, then the calling window will know when the 2nd dialog window closes, since program flow stops at the calling code immediately from when the dialog is displayed (think of how JOptionPanes work) and does not resume until the 2nd dialog window closes. It is right then that you would extract pertinent data from the objects associated with the dialog window, and this information can be obtained by simple means such as by calling appropriate getter methods.

e.g.,

JDialog someDialog = new JDialog(myJFrame, "My Dialog", ModalityType.APPLICATION_MODAL);
someDialog.add(myContentPaneWithMyGui);
someDialog.pack();
someDialog.setVisible(true);

// here code flow stops until the dialog is no longer visible.

// now call my getter to extract data
SomeType someData = myContentPaneWithMyGui.getSomeData();

answered Sep 02 '14 at 17:12

Hovercraft Full Of Eels

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i've done this in C# like this https://www.youtube.com/watch?v=_lPkc1YV2vQ&feature=youtu.be .can u please tell me to do this in Java :) – Macmarc25 Sep 02 '14 at 17:59
@Macmarc25: I thought I just did. – Hovercraft Full Of Eels Sep 02 '14 at 20:02
what is myJFrame and myContentPaneWithMyGui? – Macmarc25 Sep 03 '14 at 14:24
@Macmarc25: placeholders for whatever is your JFrame and whatever JPanel you put into your JDialog. – Hovercraft Full Of Eels Sep 03 '14 at 15:53
Can u please show me how to write getter methods on this? – Macmarc25 Sep 04 '14 at 14:51

score 1 · Answer 2 · answered Sep 02 '14 at 17:31

1

If you want to stick with your event/delegate way of doing, you could consider using BeansBinding.

It requires your model to fire events when their data changes, and add your Swing GUI elements registers as propertyListeners on those models.

answered Sep 02 '14 at 17:31

JSlain

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To the original poster, Macmarc25, this is an excellent answer that supports an MVC (model-view-control) design. 1+ – Hovercraft Full Of Eels Sep 02 '14 at 20:03
Yeah, but kind of overkill for what you wanna do... The JDialog is a way better/simpler answer. – JSlain Sep 02 '14 at 22:33

How to pass data between 2 or more ACTIVATED JFrames?

2 Answers2