How to update values of a JFrame main after using a JDialog of Java Swing?

I have a main window called MainFrame which is a jForm to which I update the data depending on a timer, but the problem is that I cannot update the data in the same MainFrame after using the jdialog, since I end up creating another duplicate window, but with the data changed, one with the original timer and the other with the new timer, I know that I can close the first window with dispose() and then keep the second, but I would like to avoid changing windows so much

the code with which I create another window when pressing the jDialog button is the following

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
        // TODO add your handling code here:

        String textoFieldTimer = jTextField1.getText();

        int timeUserConfig = Integer.parseInt(textoFieldTimer);
        
        Timer timeDefault = new Timer(timeUserConfig, null);
        
        TokenAccess token = new TokenAccess();
        token.access_code = code;

        MainFrame mainFrame = new MainFrame(token);
        mainFrame.setVisible(true);

        mainFrame.timeDefault.stop();
        mainFrame.timeDefault = timeDefault;
        
        mainFrame.setUpdateTime(timeUserConfig);
        this.dispose();

    }//GEN-LAST:event_jButton1ActionPerformed

Is there any alternative to update the window? something like mainFrame.update(); or maybe send the value of the jTextField from the jDialog to mainFrame? since the previous code creates another MainFrame for me.

Method main setLabel and Timer.start/stop

public void setUpdateTime(int timeUserConfig) {
        this.timeUserConfig = timeUserConfig;
        if (timeUserConfig == 0) {
            timeDefault.start();
            timeDefault.addActionListener(new java.awt.event.ActionListener() {
                @Override
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    setLabelText();
                    String timeUserConfigStr = Integer.toString(timeDefaultInt);
                    tiempoActualizado.setText("Tiempo de Actualizado: " + timeUserConfigStr+"ms");
                }
            });
        } else {          
            timeDefault.stop();
            timeDefault = new Timer(timeUserConfig, null);
            timeDefault.start();
            timeDefault.addActionListener(new java.awt.event.ActionListener() {
                @Override
                public void actionPerformed(java.awt.event.ActionEvent evt) {
                    setLabelText();
                    String timeUserConfigStr = Integer.toString(timeUserConfig);
                    tiempoActualizado.setText("Tiempo de Actualizado: " + timeUserConfigStr+"ms");
                }
            });
        }
    }

setLabelText is a method set of label

public void setLabelText() {

        String humedadStr = String.valueOf(humedad);
        String temperaturaStr = String.valueOf(temperatura);
        String presionStr = String.valueOf(co2);

        temporalHum.setText(humedadStr);
        temporalTemperatura.setText(temperaturaStr);
        temporalPresion.setText(presionStr);
    }

Any help would be appreciated.

Answer

Thanks for the update, and I found another solution without using an OptionPane from this question: programmatically close a JPanel which is displayed in JDialog.

I cannot replicate your codings

Start with the MainFrame, assuming you opened the JDialog by clicking on a button and wants to setText() to label lbSomething:

private void btInputActionPerformed(java.awt.event.ActionEvent evt) {
    // Open new JDialog when button is clicked
    NewJDialog dialog = new NewJDialog(new javax.swing.JFrame, true);
    dialog.setVisible(true);
    // Get user input from JDialog
    String temp = dialog.getInput();
    if (temp != null) {
        /*
         * Perform jButton1ActionPerformed() content here
         * Including timeUserConfig, timeDefault and setUpdateTime() here
         * so that you don't have to access mainFrame in the JDialog.
        */
        lbSomething.setText(temp);
    }
}

Then about the JDialog (with simple input detection):

public class NewJDialog extends javax.swing.JDialog {

    // Set the variable as class variable
    private String textTOFieldTimer;

    public NewJDialog(java.awt.Frame parent, boolean modal) {
        // default contents
    }

    @SupressWarinings("unchecked")
    private void initComponents() {
        // default contents
    }

    private void btSaveAction Performed(java.awt.event.ActionEvent evt) {
        // Check if input correct and whether to disable JDialog
        if (tfInput.getText.length() != 0) {
            input = tfInput.getText();
            // Connect to the whole JDialog by getWindowAncestor()
            Window window = SwingUtilities.getWindowAncestor(NewJDialog.this);
            // Just setVisible(false) instead of dispose()
            window.setVisible(false);
        } else {
            JOptionPane.showMessageDialog(this, "Wrong Input");
        }
    }

    public String getInput() {
        return textToFieldTimer;
    }

    // default variables declarations
}

Hope this answer helps you well.

---

Would be better if you displayed the source code, but a simple solution to update values to an existing JFrame is by using setText() and getText().

For example:

String input = JOptionPane.showInputDialog(this, "Nuevo valor");
lbPresionActual.setText(input);

If you created a self-defined JDialog, it is about to transfer the input value when closing the JDialog, and that could be a different question.