如何添加背面 button 在…之上 JTable ? 我试过了，但没有成功。

public class viewMovie extends JPanel{
    static JFrame frame = new JFrame("View Movie");
    JTable table;
     public static void main(String[] args) {
            SwingUtilities.invokeLater(() -> {
                try {
                    createAndShowGui();
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            });
        }
     static void createAndShowGui() throws Exception  {
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.getContentPane().add(new viewMovie());
            frame.pack();
            frame.setLocationRelativeTo(null);
            frame.setVisible(true);
        }
     public viewMovie() throws Exception
     {
         String sql="Select * from movie";
            DatabaseConnection db = new DatabaseConnection();
            Connection  conn =db.getConnection();
            PreparedStatement  ps = conn.prepareStatement(sql);
             ResultSet rs = ps.executeQuery();
             ResultSetMetaData rsmt= rs.getMetaData();
             int c= rsmt.getColumnCount();
             Vector column= new Vector(c);
             for(int i=1;i<=c;i++)
             {
                 column.add(rsmt.getColumnName(i));
             }
             Vector data = new Vector();
             Vector row=new Vector();
             while(rs.next())
             {
                 row=new Vector(c);
                 for(int i=1;i<=c;i++)
                 {
                     row.add(rs.getString(i));
                 }
                 data.add(row);
             }
             JButton back= new JButton("Back");
             JPanel topPanel = new JPanel(new GridLayout(1, 0, 3, 3));
                     topPanel.add(back);
                 JPanel panel= new JPanel();
                 table=new JTable(data,column);
             JScrollPane jsp = new JScrollPane(table);
                 panel.setLayout(new BorderLayout());
                 panel.add(jsp,BorderLayout.CENTER);
                 frame.setContentPane(panel);
                 frame.setVisible(true);
     } 
}

这是我得到的结果。