Question

        frame_ref = new Frame("Login");
        mainPanel_ref = new Panel();
        buttonPanel_ref = new Panel();
        grid_ref = new GridLayout(4,2);
        frame_ref.setSize(300,120);
        frame_ref.setVisible(true);

        email_ref = new TextField();
        password_ref = new JPasswordField();

        mainPanel_ref.setLayout(grid_ref);
        mainPanel_ref.add(new Label("E-Mail"));
        mainPanel_ref.add(email_ref);
        mainPanel_ref.add(new Label("Passwort"));
        mainPanel_ref.add(password_ref);

        mainPanel_ref.add(submitLogin_ref);
        mainPanel_ref.add(fehlerMeldung_ref);

        frame_ref.add(mainPanel_ref);

I set up a view in Java like above. The window is complete empty, but after I drag and drop its size, all the elements appear. Does somebody know how to fix this?

Answer 1

Call frame_ref.setVisible(true); after frame_ref.add(mainPanel_ref);.

What happens here is: You show frame by calling frame_ref.setVisible(true); and then add elements in it. So you get an empty frame. Afterwards when you drag or resize it gets repainted and you can see elements.