Cannot find symbol error

[Pooja Oza]

Can someone please help me with this code? I cannot run this program. I am getting the error - "Cannot find symbol
symbol : method setOpaque(boolean)
method : class Login
newContentPane.setOpaque(true); "
^

   
import javax.swing.AbstractButton;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JFrame;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;



public class Login extends javax.swing.JFrame implements ActionListener {




    /** Creates new form Login */
    public Login() {
        lgnbtn = new JButton("Login");
        clrbtn = new JButton("Clear");
        lgnbtn.setActionCommand("login");
        clrbtn.setActionCommand("clr");

        lgnbtn.addActionListener(this);
        clrbtn.addActionListener(this);

        add(lgnbtn);
        add(clrbtn);

        initComponents();

    }
private void lgnbtnActionPerformed(java.awt.event.ActionEvent evt) {                                       

            // TODO add your handling code here:
    }                                      

    private void clrbtnActionPerformed(java.awt.event.ActionEvent evt) {                                       
        // TODO add your handling code here:
    }                                      


    public void actionPerformed(ActionEvent ae){

           	 String msg = " ";


        if("login".equals(ae.getActionCommand()))
            msg = "You pressed Login.";
        else if("clr".equals(ae.getActionCommand()))
            msg = "You pressed Clear.";
    }
    /**
    * @param args the command line arguments
    */
   private static void createAndShowGUI(){

       JFrame frame = new JFrame("Login Demo");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

       Login newContentPane = new Login();
       newContentPane.setOpaque(true);
       frame.setContentPane(newContentPane);

       frame.pack();
       frame.setVisible(true);


   }

    public static void main(String args[]) {
        
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
               createAndShowGUI();
            }
        });
    
    
    }


    // Variables declaration - do not modify                     
    protected javax.swing.JButton clrbtn;
    private javax.swing.JLabel jLabel1;
    protected javax.swing.JButton lgnbtn;
    private javax.swing.JLabel pwdlbl;
    private javax.swing.JPasswordField pwdtxtfld;
    private javax.swing.JLabel usrlbl;
    private javax.swing.JTextField usrtxtfld;
    // End of variables declaration                   

}



 

[Rob Spoor]

setOpaque is a method of JComponent, and although JFrame is part of Swing it does not (directly or indirectly) extend JComponent. Therefore, JFrame has no such method. Since you're wrapping the Login instance in a new JFrame you might as well make Login extend JPanel instead.