JLayeredPane isnt displaying

In my applet, I have a layered pane, but it isnt showing. Can you tell me why?

Code:

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import javax.swing.*;

import java.awt.*;

public class birthday extends JApplet
{
        JPanel panel;
        JLayeredPane pane;
        JLabel background;
        ImageIcon card;
        JButton enter;
        JLabel label;
        JPasswordField pass;
        JProgressBar progress;
       
       
        public void init()
        {
                setLayout(new FlowLayout());
                setSize(700, 600);
               
                pane = new JLayeredPane();
                pane.setPreferredSize(new Dimension(400, 410));
               
                card = new ImageIcon(getClass().getResource("jfdlk.png"));
                background = new JLabel();
                background.setIcon(card);
                //background.setOpaque(true);
                //pane.add(background, 1);
               
                enter = new JButton("Press Me!");
                //pane.add(enter, JLayeredPane.DEFAULT_LAYER);
                pane.add(enter, new Integer(1));
                JButton t2 = new JButton();
                t2.setBackground(Color.white);
                pane.add(t2, new Integer(0));
                //panel = new JPanel();
                //panel.add(pane);
                //panel.add(enter);
               
                add(pane);
                //add(enter);
                //getContentPane().add(panel);
               
               
               
               
        }
       
}

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Never mind I figured it out, there was not layout in the pane, so I had to set the bounds myself. thanks anyway. But I do have a question, why must you put new Integer(x) in pane.add()? Why can't you just put x?