Java - BoxLayout面板中的面板分开

Question

我有这段代码：

    //Panell Order
    JPanel jorder = new JPanel();
    jorder.setLayout(new BoxLayout(jorder, BoxLayout.Y_AXIS));
    jorder.setBorder(BorderFactory.createTitledBorder("Order"));
    jorder.setPreferredSize(new Dimension(300,250));
    //Panell 1
    JPanel jp1 = new JPanel();
    ((FlowLayout)jp1.getLayout()).setAlignment(FlowLayout.CENTER);
    JLabel jusuari = new JLabel("User name:         ");
    JLabel jnom = new JLabel("edetorres");
    jp1.add(jusuari);
    jp1.add(jnom);
    //Panell 2
    JPanel jp2 = new JPanel();
    ((FlowLayout)jp2.getLayout()).setAlignment(FlowLayout.CENTER);
    JLabel jproduct = new JLabel("Product:          ");
    JLabel jcomanda = new JLabel("Tallat");
    jp2.add(jproduct);
    jp2.add(jcomanda);
    //Panel 3
    JPanel jp3 = new JPanel();
    JButton jserve = new JButton("Serve");
    jserve.setAlignmentX(Component.CENTER_ALIGNMENT);
    jp3.add(jserve);
    //Afegir al panell Order
    jorder.add(jp1);
    jorder.add(jp2);
    jorder.add(jp3);

问题是它返回一个面板，其中三个面板（jp1，jp2，jp3）分开，如下所示：

如何将这3个面板放在一起？