How to add component to JPanel

Question

Hello,
I Try to add a JPnel to other JPnel
but it works not ther is a error in this code ??
class MyClass extends JFrame
    Container contentPane;
  public MyClass()
              contentPane = this.getContentPane();
              contentPane.setBorderLayout(new BorderLayout());
             MainPanel();
puplic void MainPanel()
     Dimension dim = new Dimension(w,h);
     Dimension aDim = new Dimension((w / 2),(h / 2));
     JPanel mainPanel = JPanel();
     mainPanel.setPrefferedSize(dim);
     mainPanel.setLayout(new BorderLayout());
     JPanel pp = getLanguagePanel(aDim);
     pp.revalidate();
     mainPanel.add(pp,BorderLayout.PAGE_END);
     mainPanel.revalidate();
     contentPane.add(mainPanel,BoderLayout.CENTER)
public JPanel getLanguagePanel(Dimension aDim)
         JPanel retPanel = new JPanel();
     retPanel.setPreferredSize(aDim);
     retPanel.setBorder(null);
     JLabel L = new JLabel("Test Label");
     L.setBounds(50,50,250,30);
     retPanel.add(L);
     retPanel.setBackground(Color.GREEN);
     retPanel.setOpaque(true);
     retPanel.revalidate();
     retPanel.repaint();
     return retPanel;
}thanks

Answer 1

contentPane.setBorderLayout(...)There is no such method. Your compiler should be telling you this.
puplic void MainPanel()There is no such modifier. Your compiler should be telling you this.
mainPanel.setPrefferedSize(...)There is no such method. Your compiler should be telling you this.
BoderLayout.CENTERThere is no such class. Your compiler should be telling your this.