Problem with menu and panel

Question

hi,
i m new to java still learning new concepts. When i was working with menu and panel i got this problem and i tried a lot but still i havn't got any success. the problem is i m creating a menu with two menuitem - one for "add item" and another for "modify item". What i want to do that on the same frame i want to create two panel of these two item. when i click "add item" option it should show add window and so with modify option. but the problem is if i click add item it shows the addpanel but when i click modify option (add item panel goes- ok ..) but it doesn't show the modify panel, it shows only the main frame on which menu is there.
i cannot understant what is happing here plz guide me.
thanx

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
public class ajitAutomobile extends JFrame implements ActionListener
     JMenuBar mb;
     JMenu jobmenu;
     JMenuItem newJobCard,modifyJobCard;
     Font ft;
     JPanel pnlnewJobCard,pnlmodifyJobCard;
     Container con;
     ajitAutomobile()
     ft=new Font("Arial",0,12);
     mb=new JMenuBar();
     setJMenuBar(mb);
     jobmenu=new JMenu(" Job Card Form");
     mb.add(jobmenu).setFont(ft);
     newJobCard=new JMenuItem("New Job Card Detail");
     modifyJobCard=new JMenuItem("Modify Job Card Detail");
     jobmenu.add(newJobCard).setFont(ft);     
     jobmenu.add(modifyJobCard).setFont(ft);     
     mb.add(requisition).setFont(ft);
     con=getContentPane();
     // setting panel for new JOb Card Entry
     pnlnewJobCard=new JPanel();
     pnlmodifyJobCard=new JPanel();
     con.add(pnlmodifyJobCard);
     con.add(pnlnewJobCard);
     pnlnewJobCard.setBackground(Color.RED);     
     pnlnewJobCard.setVisible(false);
     pnlmodifyJobCard.setBackground(Color.YELLOW);
     pnlmodifyJobCard.setVisible(false);
     //setting JFrame resources
     setVisible(true);
     setTitle("Ajit Automobile Service Center");
     setSize(750,300);
     setResizable(false);
     newJobCard.addActionListener(this);
     modifyJobCard.addActionListener(this);
     public void actionPerformed(ActionEvent ae)
          if (ae.getSource()==newJobCard)
               pnlnewJobCard.setVisible(true);
                                                                pnlmodifyJobCard.setVisible(false);
          if(ae.getSource()==modifyJobCard)
                                                                         pnlnewJobCard.setVisible(false);
                                                                pnlmodifyJobCard.setVisible(true);
     public static void main(String args[])
     ajitAutomobile objajit=new ajitAutomobile();
     objajit.show();
}so, this is the code and as i m expecting that when i click on "New Job Card Detail" then it should display pnlnewJobCard and when i will click "Modify Job Card Detail" it should display pnlmodifyJobCard panel but it is not working.It shows only that panel which is clicked first.
plz help
thnx, any answer will be appriciated.