JList not showing items

Question

I got some problems showing the items of a JList.

DefaultListModel<String> model = new DefaultListModel<String>();
model.addElement("one");
model.addElement("two");
model.addElement("three");

list = new JList<String>(model);
list.setCellRenderer(new DefaultListCellRenderer());
list.setVisible(true);

I also tried it without setting a ListCellRenderer , still no luck.

Can you suggest me what I am doing wrong?

Answer 1

Thanks for your anwsers and comments. The problem was that no list item where shown.

In future I will add a minimal compilable program.

My problem was caused by trying to add a JPanel to a JDialog in the constructor, but the JPanel was null at this moment because it got initialized in the createUIComponents method.

A beginner begs your pardon.

Answer 2

This works for me:

public class JListTest implements Runnable {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new JListTest());
    }

    @Override
    public void run() {
        JFrame frame = new JFrame(getClass().getSimpleName());
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setSize(640, 480);
        frame.setLayout(new BorderLayout(4, 4));
        frame.add(getComponent(), BorderLayout.CENTER);
        frame.pack();
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    Component getComponent() {
        DefaultListModel<String> model = new DefaultListModel<>();
        model.addElement("one");
        model.addElement("two");
        model.addElement("three");

        JList<String> list = new JList<>(model);
        list.setCellRenderer(new DefaultListCellRenderer());
        list.setVisible(true);
        return list;
    }
}