当我调用我的jdialog类时，我一次又一次地遇到这个问题，它没有显示任何内容这是jdialog接口的代码：

public JMovie() {
    JFrame f = new JFrame();
    JDialog jmovie = new JDialog(f,"JMovie Dialog");
    jmovie.setLayout(new BorderLayout());
    okbutton = new JButton("Ok");
    cancelbutton = new JButton("Cancel");
    title = new JLabel("Title", SwingConstants.RIGHT);
    date = new JLabel("Date made on ", SwingConstants.RIGHT);
    price = new JLabel("Price", SwingConstants.RIGHT);
    inputdate = new JLabel("dd/mm/yyyy");

    Ttitle = new JTextField(null, 15);
    TMadeon = new JTextField(null, 10);
    TPrice = new JTextField(null, 6);

    jp1 = new JPanel();
    jp2 = new JPanel();
    jp3 = new JPanel();
    jb = new JPanel();
    jl = new JPanel();

    okbutton.addActionListener(this);
    cancelbutton.addActionListener(this);

    Ttitle.setName("Title");
    TMadeon.setName("Date Made on");
    TPrice.setName("Price");

    jb.add(okbutton);
    jb.add(cancelbutton);

    title.setAlignmentX(Component.RIGHT_ALIGNMENT);
    date.setAlignmentX(Component.RIGHT_ALIGNMENT);
    price.setAlignmentX(Component.RIGHT_ALIGNMENT);

    JPanel south = new JPanel(new FlowLayout());
    south.add(jb, BorderLayout.SOUTH);

    JPanel west = new JPanel(new GridLayout(3,1));
    west.add(title,BorderLayout.WEST);
    west.add(date,BorderLayout.WEST);
    west.add(price,BorderLayout.WEST);

    JPanel center = new JPanel(new GridLayout(3,1));
    center.add(jp3,FlowLayout.LEFT);
    center.add(jp2,FlowLayout.LEFT);
    center.add(jp1,FlowLayout.LEFT);
    inputdate.setEnabled(false);

    jmovie.setSize(350, 150);
    jmovie.setLocation(300,300);
    jmovie.setVisible(true);

    jmovie.add(south);
    jmovie.add(west);
    jmovie.add(center);
}

这是接口jmovie对话框的代码，我在这里用另一个类调用它。

public void actionPerformed(ActionEvent event) {
        if(event.getSource().equals(btnMAdd))
        {
            JMovie ne = new JMovie();
            ne.setVisible(true);
        }
    }

当我运行时，它显示：