Thread: Java program for to implement supermarket menu

I have been asked to create a java window tool kit as follows and make the 'rumolar' 'supermarket' menu have addition,subtraction where the total addition will be added every time into a file, also the rumolar --- 'rental' should have rental materials and should deduct rented materials when neccessary . . . . .

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 
public class rum extends JFrame implements ActionListener{
 
    public static void main(String[] argv) {
        rum mainApp = new rum();
    }
    public rum()
    {
 
        super("Store Query");
        setBounds(0, 0, 300, 300);
        setResizable(false);
        setLocation(400,250);
        setSize(400,400);
        getContentPane().setLayout(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
 
        passwordfield = new JPasswordField(15);
        passwordfield.setLocation(140, 10);
        passwordfield.setSize(passwordfield.getPreferredSize());
 
        String passwordString = String.copyValueOf(passwordfield.getPassword());
 
 
        button1 = new JButton("Admin Login");
        button1.setLocation(10, 40);
        button1.setSize(button1.getPreferredSize());
 
        button1.addActionListener(this);
 
        getContentPane().add(button1);
        setVisible(true);
  /**      
        button1 = new JButton(new ImageIcon("image.jpg"));
 
        button1.setPressedIcon(new ImageIcon("image.jpg"));
        button1.setRolloverIcon(new ImageIcon("image.jpg"));
 
        button1.setFocusPainted(false);
        button1.setContentAreaFilled(false);
        button1.setBorderPainted(false);
 
        button1.setMargin(new Insets(0, 0, 0, 0));
 
        button1.addActionListener(this);
 
        getContentPane().add(button1);
        setVisible(true);
*/
 
        menuBar = new JMenuBar();
        menuBar.setBounds(0, 0, 400, 25);
 
        fileMenu = new JMenu("File");
        fileMenu.setMnemonic('F');
 
        openItem = new JMenuItem("Open...");
        openItem.addActionListener(this);
 
        saveItem = new JMenuItem("Save...");
        saveItem.addActionListener(this);
 
        quitItem = new JMenuItem("Quit");
        quitItem.addActionListener(this);
        // add items to file menu object
        fileMenu.add(openItem);
        fileMenu.add(saveItem);
        fileMenu.addSeparator();
        fileMenu.add(quitItem);
 
        //creating rumolar menu
 
        rumolarMenu = new JMenu("Rumolar");
        rumolarMenu.setMnemonic('R');
        //creating items under rumolar
        RentalItem = new JMenuItem("Rentals");
        RentalItem.addActionListener(this);
 
        SupermarketItem = new JMenu("Supermarket");
        SupermarketItem.addActionListener(this);
 
        OthersItem = new JMenu("Others");
        OthersItem.addActionListener(this);
        //add items under rumolar to rumolar menu bar
        rumolarMenu.add(RentalItem);
        rumolarMenu.add(SupermarketItem);
        rumolarMenu.add(OthersItem);
 
        //creating the about tab
 
        AboutMenu = new JMenu("About");
        AboutMenu.addActionListener(this);
        AboutMenu.setMnemonic('A');
 
        //adding to main menu bar
 
        menuBar.add(fileMenu);
        menuBar.add(rumolarMenu);
        menuBar.add(AboutMenu);
 
        getContentPane().add(menuBar);
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e)
    {
        if (e.getSource() == openItem)
        {
            //what to open
            JOptionPane.showMessageDialog(this, "You selected the 'open' menu option", "Info", 
                JOptionPane.INFORMATION_MESSAGE); 
        }
        else if (e.getSource() == saveItem)
        {
            //what to save
            JOptionPane.showMessageDialog(this, "You selected the 'save' menu option", "Info",
                JOptionPane.INFORMATION_MESSAGE);    
        }
        else if (e.getSource() == quitItem)
        {
            System.exit(1);
        }
        else if (e.getSource() == RentalItem)
        {
            JOptionPane.showMessageDialog(this, "You selected the 'Rumolar rentals' menu option", "Info",
                JOptionPane.INFORMATION_MESSAGE);  
        }
        else if (e.getSource() == SupermarketItem)
        {
            JOptionPane.showMessageDialog(this, "You selected the 'Rumolar Supermarket' menu option", "Info",
                JOptionPane.INFORMATION_MESSAGE);  
        }
        else if (e.getSource() == OthersItem)
        {
            JOptionPane.showMessageDialog(this, "You selected the 'Rumolar others' menu option", "Info",
                JOptionPane.INFORMATION_MESSAGE);  
        }
         else if (e.getSource() == AboutMenu)
        {
            JOptionPane.showMessageDialog(this, "This program was developed for RUMOLAR INC. by RUMOLAR SOFTWARES", "Info",
                JOptionPane.INFORMATION_MESSAGE);  
        }
        else if(e.getSource() == button1)
        {
            getContentPane().add(passwordfield);
            setVisible(true);
        }
       }
 
    JMenuBar menuBar;
        JMenu fileMenu;
            JMenuItem openItem;
            JMenuItem saveItem;
             JMenuItem quitItem;
        JMenu rumolarMenu;
            JMenuItem RentalItem;
            JMenuItem SupermarketItem;
            JMenuItem OthersItem;
        JMenu AboutMenu;
       JButton button1;
       JPasswordField passwordfield;
 
}