How do you pass values from a JTable in a second JFrame to text fields in the original JFrame?

Passing Values Between JFrames

Challenge

When clicking on a row in a JTable within a second JFrame, the objective is to have the selected values populate text fields in the original JFrame.

Analysis

While the program architecture may suggest using a JDialog rather than a JFrame, both rely on the same principle of passing GUI object references like in standard Java code.

In the case of JFrame windows opening other JFrames, the first frame typically holds a reference to the second, allowing it to call its methods. The timing for these calls depends on whether the second frame is a modal dialog or not.

Solution

For modal dialogs, the ideal time to retrieve state is immediately after the dialog returns. For non-modal dialogs, a listener can be employed to monitor when information should be extracted.

Example Code

To illustrate this concept with a simple example, consider the following code:

<code class="java">// MyFramePanel holds a reference to MyDialogPanel and its JDialog

class MyFramePanel extends JPanel {

    // ...

    // When the "Open Dialog" button is clicked, the dialog is opened
    private void openTableAction() {
        if (dialog == null) {
            dialog = new JDialog(win, "My Dialog", ModalityType.APPLICATION_MODAL);
            dialog.getContentPane().add(dialogPanel);
            dialog.pack();
            dialog.setLocationRelativeTo(null);
        }
        dialog.setVisible(true); // Modal dialog takes over

        // After the dialog is disposed, retrieve the text from its JTextField
        field.setText(dialogPanel.getFieldText());
    }
}</code>

This example demonstrates how the reference to the dialog panel enables the text field data from the dialog to be transferred to the text field in the main frame. A similar technique can be applied to retrieving data from a JTable.

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