Adding componets to a new class

Question

I've created a new class for BidFrame Jframe, and would like to get contents from the previous method to use, or even start afresh. But when i declare an item, it still doesn't work. What am i doing wrong? The problem lies in BidFrame extend JFrame....if the code is taken out of the two brackets, everything else works. Please help
import java.awt.*;
import java.awt.event.*;
import java.text.DecimalFormat;
import javax.swing.*;
import javax.swing.border.*;
import java.lang.*;
public class EasyAuction extends JFrame
     // JPanel for login window
             private JPanel  biddingJPanel, oneJPanel, welcomeJPanel, registertwoaJPanel;
             private JLabel titleJLabel, buyernameJLabel, buyerpasswordJLabel, buyerJLabel, sellernameJLabel, sellerpasswordJLabel, sellerJLabel;
             private JButton buyerJButton, sellerJButton, registeroneJButton, registertwoJButton;
             private JTextField buyernameJTextField, buyerpasswordJTextField, sellernameJTextField, sellerpasswordJTextField;
             private JComboBox itemJComboBox;
             public JPanel BidFrameJFrame;
//Publics JPanels
//public JPanel registertwoJFrame;
            //contentPane
             public Container contentPane, c;
             //no argument constructor
             public EasyAuction()
                  createUserInterface();
             //create and position components
             private void createUserInterface()
                 //get contentPane
                  contentPane = getContentPane();
                  c = getContentPane();
               //and set layout to null
                  contentPane.setLayout(null);
                  c.setLayout(null);
               //goes to public void welcome
                  login();
                  //set properties of applications window
                  setTitle( "Easy Auction" ); // set JFrame's title bar string
                setSize( 300, 200);   // set width and height of JFrame
                setVisible( true );    // display JFrame on screen
             } // end method createUserInterface
             public void login(){
                       //setup oneJPanel
                       oneJPanel = new JPanel();
                       oneJPanel.setLayout( new FlowLayout() );
                       oneJPanel.setBounds(0,0, 300,200);
                       oneJPanel.setVisible(true);
                     // setup buyernameJLabel
                     buyernameJLabel = new JLabel();
                     buyernameJLabel.setText("Buyer Name");
                     oneJPanel.add( buyernameJLabel );
                     //setup nameJTextField
                     buyernameJTextField = new JTextField(15);
                    buyernameJTextField.
                    setEnabled(true);
                    oneJPanel.add( buyernameJTextField );
                    //setup buyerpasswordJLabel
                    buyerpasswordJLabel = new JLabel();
                    buyerpasswordJLabel.setText("Pass word  ");
                    oneJPanel.add( buyerpasswordJLabel);
                    //setup buyerpasswordJTextField
                    buyerpasswordJTextField = new JTextField(15);
                    buyerpasswordJTextField.setEnabled(true);
                    oneJPanel.add( buyerpasswordJTextField);
                    //setup buyerJLabel
                    buyerJLabel = new JLabel();
                    buyerJLabel.setText("Click on Buyer Button");
                    oneJPanel.add(buyerJLabel);
                    //setup buyerJButton
                    buyerJButton = new JButton ();
                    buyerJButton.setText("Buyer");
                    buyerJButton.setBackground( Color.YELLOW );
                    oneJPanel.add( buyerJButton );
                    buyerJButton.addActionListener(
                         new ActionListener(){
                              public void actionPerformed( ActionEvent event )
                                   BidFrame f = new BidFrame();
                               f.setVisible(true);
                    //setup registeroneJButton
                    registeroneJButton = new JButton ();
                    registeroneJButton.setText ("Register");
                    registeroneJButton.setBackground ( Color.ORANGE);
                    oneJPanel.add( registeroneJButton);
                    //setup sellernameJLabel
                    sellernameJLabel = new JLabel();
                    sellernameJLabel.setText("Seller Name");
                    oneJPanel.add( sellernameJLabel);
                    //setup sellernameJTextField
                    sellernameJTextField = new JTextField(15);
                    sellernameJTextField.setEnabled(true);
                    oneJPanel.add(sellernameJTextField);
                    //setup sellerpasswordJLabel
                    sellerpasswordJLabel = new JLabel();
                    sellerpasswordJLabel.setText("Pass word  ");
                    oneJPanel.add( sellerpasswordJLabel );
                    //setup sellerpasswordJTextField
                    sellerpasswordJTextField = new JTextField(15);
                    sellerpasswordJTextField.setEnabled(true);
                    oneJPanel.add( sellerpasswordJTextField );
                    //setup sellerJLabel
                    sellerJLabel = new JLabel();
                    sellerJLabel.setText("Click on Seller Button");
                    oneJPanel.add(sellerJLabel);
                    //setup sellerJButton
                    sellerJButton = new JButton ();
                    sellerJButton.setText("Seller");
                    sellerJButton.setBackground( Color.YELLOW );
                    oneJPanel.add( sellerJButton );
                    //setup registertwoJButton ();
                    registertwoJButton = new JButton ();
                    registertwoJButton.setText("Register");
                    registertwoJButton.setBackground( Color.ORANGE);
                    oneJPanel.add( registertwoJButton );
                    contentPane.add(oneJPanel);
                return;          
          public class BidFrame extends JFrame
                  oneJPanel.setVisible(false);
               biddingJPanel = new JPanel ();
     biddingJPanel.setLayout( new FlowLayout() );
          biddingJPanel.setBounds(0, 0, 300,200);
          biddingJPanel.setVisible(true);
          setup itemJComboBox
          itemJComboBox = new JComboBox( );
          biddingJPanel.add (itemJComboBox);
          contentPane.add(biddingJPanel);
          // main method
             public static void main( String[] args )
                EasyAuction application = new EasyAuction();
                application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
             } // end method main
}//ends public class Bidding 

Answer 1

Normally you would use a modal JDialog, not a JFrame, to gather additional information.
If you need data to display in the dialog then just pass the data when you create the dialog:
BidDialog dialog = new BidDialog(parameter1, parameter2, ....);
dialog.setModal( true );
dialog.setVisible(true);