BoxLayout not showing all components

Question

I am not sure how to fix this, I have several JPanels (used for drawing) inside a main JPanel using BoxLayout. The JPanels have a set minimum size and preferred size. The main JPanel only shows the 3 out of the five, as it is too small. I tried setting the size of the main JPanel pretty large and also tried adding a scroler but then nothing shows up.

Here is some code:

public static void main(String[] args) throws XMLStreamException, IOException {
    JFrame frame = makeFrame(500, 500);
    JPanel panel = new JPanel();
    panel.setSize(1800, 1800);
    JScrollPane scroller = new JScrollPane(panel);  

    panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));


    frame.add(scroller);

    test1(panel);

}
public static JFrame makeFrame(int sizex, int sizey){

    JFrame frame = new JFrame();

    frame.setTitle("FDA");
    frame.setSize(sizex, sizey);
    frame.setLocationRelativeTo(null);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    frame.setVisible(true);
    return frame;
}

test1 adds six JPanels with size 360x360 to panel.

With the scrollbar I only see one of the JPanels, and no scrollbars appear.

Edit: I have to wait until all my calculations are done before I paint the main JPanel, that is why it wasn't displaying the last 3.

Answer 1

• frame.setVisible(true); is executed before its JComponents are created and added (to this already visible JFrame)

• please whats test1(panel);