Question

I’m currently building an application and it has a JFrame and a JDialog. The JFrame has a JList called:

JList lstMainVenuesEvents = new JList();

And I’m trying to get the value of lstMainVenuesEvents by using:

lstMainVenuesEvents.getSelectedIndex();

I can get the value perfectly fine on my JFrame, but how do I pass it to my JDialog? I thought about creating a setter method in one of my class files and then just getting that value from my JDialog file, but surely there’s an easy way? Is it possible to just have a method of some sort that passes the data from the JFrame to the JDialog like a POST request in PHP?

Apologies if I’ve missed anything crucial out.

Update: here’s the code for my JList and JDialog show.

JList lstMainVenuesEvents = new JList();
    lstMainVenuesEvents
            .addListSelectionListener(new ListSelectionListener() {
                public void valueChanged(ListSelectionEvent e) {
                    // stop from firing twice
                    if (e.getValueIsAdjusting()) {
                        EventModify evtWindow = new EventModify();
                        evtWindow.setVisible(true);
                    }
                }
            });

Answer 1

I can’t be confident it’s “right” but an inversion of control sort of approach usually reduces passing values around.

Assuming the value lstMainVenuesEvents.getSelectedIndex() is used on a particular action/event in the JDialog you could set an ActionListener from the JFrame.

// some where in the JFrame
jDialog.setButtonPressed(new ActionListener() {
    public void actionPerformed(ActionEvent evt)
    {
        // lstMainVenuesEvents.getSelectedIndex() is accessible in this block
        // put code logic here where
    }
});