Así que estoy trabajando en un sistema de alquiler de DVD en Java y me he encontrado con problemas de visualización. Aquí está mi código:

import javax.swing.*;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import java.awt.*;
import java.awt.event.*;
public class RentalSystem extends JFrame {

JMenuBar menuBar;
JMenuItem insertMember;
JMenuItem deleteMember;
JMenuItem editMember;
JMenuItem retrieveMember;
JMenuItem insertRelease;
JMenuItem deleteRelease;
JMenuItem editRelease;
JMenuItem retrieveRelease;
JMenu menu;
JMenu menu2;
JComboBox searchMember;
JComboBox searchRelease;
JButton adminButton;
JButton userButton;
JButton existingUser;
JButton newUser;
JTable memberTable; 
JTable releaseTable; 
int existingUserCheck = 1; //0 = existing user, 1 = new user
int adminCheck = 1; //0 = admin, 1 = customer


public RentalSystem()
{
    super("Tape/DVD/Game Rental System");
    setBounds(0,0,1000,500);
    //while(adminCheck == 0)
    {
        display2();
        while(existingUserCheck == 0) {

        }
    }

}
private class MenuActionListener implements ActionListener {

      public void actionPerformed(ActionEvent e) {

        if(e.getSource() == "insertMember");
        {
            String name = JOptionPane.showInputDialog("Enter Last Name:");
            String name2 = JOptionPane.showInputDialog("Enter First Name:");
            String ss = JOptionPane.showInputDialog("Enter Social Security Number:");
            int a = Integer.parseInt(ss);
            String email = JOptionPane.showInputDialog("Enter Email Address:");
            String phoneNumber = JOptionPane.showInputDialog("Enter Phone Number:");
            int b = Integer.parseInt(phoneNumber);
            String address = JOptionPane.showInputDialog("Enter Address:");

            Member member = new Member(name, name2, a, email, b, address);
            //add member to table

        }
        if(e.getSource() == "deleteMember");
        {

        }
        if(e.getSource() == "editMember");
        {

        }
        if(e.getSource() == "retrieveMember");
        {

        }
        if(e.getSource() == "insertRelease");
        {
            String title = JOptionPane.showInputDialog(this  ,"Enter Title:");
            String type = JOptionPane.showInputDialog(this  ,"Enter Type(Tape/DVD/Game):");
            String releaseYear = JOptionPane.showInputDialog(this  ,"Enter Year of Release:");
            int a = Integer.parseInt(releaseYear);
            String price = JOptionPane.showInputDialog(this  ,"Enter Price:");
            int b = Integer.parseInt(price);


            Item item = new Item(title, type, a, b);
            //add item to table

        }
        if(e.getSource() == "deleteRelease");
        {

        }
        if(e.getSource() == "editRelease");
        {

        }
        if(e.getSource() == "retrieveRelease");
        {

        }
      }
    }

private class ComboBoxActionListener implements ActionListener {


    public void actionPerformed(ActionEvent e) {

        String s = (String) searchMember.getSelectedItem();
        String f = (String) searchRelease.getSelectedItem();


            if(s.equals("Last Name")){

            }
            else if(s.equals("First Name")){
            }
            else if(s.equals("Phone Number")){
            }
            else if(s.equals("Member ID")){
            }

            if(f.equals("Title")){

            }
            else if(f.equals("Category")){
            }
            else if(f.equals("Type")){
            }
            else if(f.equals("Rental ID")){

            }


            if(e.getSource() == "Existing User")
            {

            }


    }

}

private class ButtonListener implements ActionListener {

    @Override
    public void actionPerformed(ActionEvent e) {

        if(e.getSource() == adminButton)
        {
            menuBar = new JMenuBar();
            menu = new JMenu("Members");
            menuBar.add(menu);
            menu2 = new JMenu("Releases");
            menuBar.add(menu2);

            insertMember = new JMenuItem("Insert New Member");
            deleteMember = new JMenuItem("Delete Member");
            editMember = new JMenuItem("Edit Member");
            retrieveMember = new JMenuItem("Retrieve Member");
            menu.add(insertMember);
            menu.add(deleteMember);
            menu.add(editMember);
            menu.add(retrieveMember);
            insertRelease = new JMenuItem("Insert New Release");
            deleteRelease = new JMenuItem("Delete Release");
            editRelease = new JMenuItem("Edit Release");
            retrieveRelease = new JMenuItem("Retrieve Release");
            menu2.add(insertRelease);
            menu2.add(deleteRelease);
            menu2.add(editRelease);
            menu2.add(retrieveRelease);

            JScrollPane c  = new JScrollPane();
            JScrollPane b = new JScrollPane();


            TableModel memberModel = new MemberTableModel();
            TableModel itemModel = new ItemTableModel();
            memberTable = new JTable(memberModel);
            releaseTable = new JTable(itemModel);

            c.add(memberTable);
            c.add(releaseTable);

            String[] searchMemberChoices = {"Search Members By:", "Last Name", "First Name","Phone Number", "Member ID"};
            String[] searchReleaseChoices = {"Search Releases By:", "Title" , "Category", "Type", "Release ID" };
            searchMember = new JComboBox(searchMemberChoices);
            searchRelease = new JComboBox(searchReleaseChoices);


            //add(c, BorderLayout.CENTER);
            //add(b, BorderLayout.SOUTH);
            add(searchMember, BorderLayout.WEST);
            add(searchRelease, BorderLayout.EAST);
            add(menuBar, BorderLayout.NORTH);

            setVisible(true);
            setResizable(true);
            setDefaultCloseOperation(EXIT_ON_CLOSE);

            insertMember.addActionListener(new MenuActionListener());
            deleteMember.addActionListener(new MenuActionListener());
            editMember.addActionListener(new MenuActionListener());
            retrieveMember.addActionListener(new MenuActionListener());
            insertRelease.addActionListener(new MenuActionListener());
            deleteRelease.addActionListener(new MenuActionListener());
            editRelease.addActionListener(new MenuActionListener());
            retrieveRelease.addActionListener(new MenuActionListener());
            searchMember.addActionListener(new ComboBoxActionListener());
            searchRelease.addActionListener(new ComboBoxActionListener());
        }
        if(e.getSource() == userButton)
        {
            adminCheck = 1;

            menuBar = new JMenuBar();
            menu = new JMenu("Members");
            menuBar.add(menu);
            menu2 = new JMenu("Releases");
            menuBar.add(menu2);


            retrieveMember = new JMenuItem("Retrieve Member");
            menu.add(retrieveMember);
            retrieveRelease = new JMenuItem("Retrieve Release");
            menu2.add(retrieveRelease);

            JScrollPane c  = new JScrollPane();
            JScrollPane b = new JScrollPane();


            TableModel memberModel = new MemberTableModel();
            TableModel itemModel = new ItemTableModel();
            memberTable = new JTable(memberModel);
            releaseTable = new JTable(itemModel);



            c.add(memberTable);
            c.add(releaseTable);


            String[] searchMemberChoices = {"Search Members By:", "Last Name", "First Name","Phone Number", "Member ID"};
            String[] searchReleaseChoices = {"Search Releases By:", "Title" , "Category", "Type", "Release ID" };
            searchMember = new JComboBox(searchMemberChoices);
            searchRelease = new JComboBox(searchReleaseChoices);


            //add(c, BorderLayout.CENTER);
            //add(b, BorderLayout.SOUTH);
            add(searchMember, BorderLayout.WEST);
            add(searchRelease, BorderLayout.EAST);
            add(menuBar, BorderLayout.NORTH);


            setVisible(true);
            setResizable(true);
            setDefaultCloseOperation(EXIT_ON_CLOSE);


            insertMember.addActionListener(new MenuActionListener());
            deleteMember.addActionListener(new MenuActionListener());
            editMember.addActionListener(new MenuActionListener());
            retrieveMember.addActionListener(new MenuActionListener());
            insertRelease.addActionListener(new MenuActionListener());
            deleteRelease.addActionListener(new MenuActionListener());
            editRelease.addActionListener(new MenuActionListener());
            retrieveRelease.addActionListener(new MenuActionListener());
            searchMember.addActionListener(new ComboBoxActionListener());
            searchRelease.addActionListener(new ComboBoxActionListener());

        }



        if(e.getSource() == existingUser);
        {

        }
         if(e.getSource() == newUser)
            {
                existingUserCheck = 1;
                JTextField field1 = new JTextField("");
                JTextField field2 = new JTextField("");
                JTextField field3 = new JTextField("");
                JTextField field4 = new JTextField("");
                JTextField field5 = new JTextField("");
                JTextField field6 = new JTextField("");

                JPanel panel = new JPanel(new GridLayout(0, 1));
                panel.add(new JLabel("Last Name:"));
                panel.add(field1);
                panel.add(new JLabel("First Name:"));
                panel.add(field2);
                panel.add(new JLabel("Social Security #:"));
                panel.add(field3);
                panel.add(new JLabel("Email:"));
                panel.add(field4);
                panel.add(new JLabel("Phone Number:"));
                panel.add(field5);
                panel.add(new JLabel("Address"));
                panel.add(field6);
                add(panel);
                int result = JOptionPane.showConfirmDialog(null, panel, "Registration",
                    JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE);
                if (result == JOptionPane.OK_OPTION) {

                    int ss = Integer.parseInt(field3.getText());
                    int phoneNumber = Integer.parseInt(field5.getText());

                      //memberTable.addMember(field1.getText(),field2.getText(), ss, field4.getText(), phoneNumber, field6.getText());

                }
            }
    }
}
class MemberTableModel extends AbstractTableModel {

    private String[]  headers = {"Last Name", "First Name", "SS#", "Email", "Phone Number", "Address"};


    @Override
    public int getColumnCount() {

        return headers.length;
    }

    @Override
    public int getRowCount() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Object getValueAt(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return null;
    }
    public void setValueAt(Member a, int rowIndex, int colIndex)
    {

    }

}
class ItemTableModel extends AbstractTableModel {

    @Override
    public int getColumnCount() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int getRowCount() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public Object getValueAt(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return null;
    }
    public void setValueAt()
    {

    }

}
public void display()//displays first screen:admin/user log-in
{
     userButton = new JButton("User");
     adminButton = new JButton("Admin");

    JPanel panel = new JPanel(new GridLayout(0, 1));
    panel.add(userButton);
    panel.add(adminButton);
    add(panel);

    userButton.addActionListener(new ButtonListener());
    adminButton.addActionListener(new ButtonListener());


    setVisible(true);
    setResizable(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

}

public void display2()//displays second screen:user log-in / register
{
     existingUser = new JButton("Existing User");
     newUser = new JButton("New User");

    JPanel panel = new JPanel(new GridLayout(0, 1));
    panel.add(newUser);
    panel.add(existingUser);
    add(panel);

    existingUser.addActionListener(new ButtonListener());
    newUser.addActionListener(new ButtonListener());


    setVisible(true);
    setResizable(true);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

}
public void display3() //displays user screen/functionality
{

}
public static void main(String[] args) {

    JFrame frame = new RentalSystem();

}
}

Ahora, Miembro y Elemento son solo clases de Objetos que hice para representar a los usuarios (Miembros) y las películas / juegos (Elementos).

public class Member {
 int status;
 String firstName;
 String lastName;
 int ss;
 String email;
 int phoneNumber;
 String address;
 int memberID;

 public Member()
 {

 }
 public Member(String firstName, String lastName, int ss, String email, int phoneNumber, String address)
 {
     this.firstName = firstName;
     this.lastName = lastName;
     this.ss = ss;
     this.email = email;
     this.phoneNumber = phoneNumber;
     this.address = address;
 }

public void setName(String firstName, String lastName)
 {
     this.firstName = firstName;
     this.lastName = lastName;
 }
 public String getName()
 {
     return firstName + " " + lastName;
 }
 public void setSS(int ss)
 {
     this.ss = ss;
 }
 public int getSS()
 {
     return ss;
 }
 public void setEmail(String email)
 {
     this.email = email;
 }
 public String getEmail()
 {
     return email;
 }
 public void setPhoneNumber(int phoneNumber)
 {
     this.phoneNumber = phoneNumber;
 }
 public int getPhoneNumber()
 {
     return phoneNumber;
 }
 public void setAddress(String address)
 {
     this.address = address;
 }
 public String getAddress()
 {
     return address;
 }
 public void setMemberID(int memberID)
 {
     this.memberID = memberID;
 }
 public int getMemberID()
 {
     return memberID;
 }
 public void setStatus(int status)
 {
     this.status = status;
 }
 public int getStatus()
 {
     return status;
 }
}

y

public class Item {

String title;
String type;
int releaseYear;
int rentalID;
int price;
boolean inStock;

public Item()
{

}
public Item(String title, String type, int releaseYear, int price)
{
    this.title = title;
    this.type = type;
    this.releaseYear = releaseYear;
    this.price = price;

}
public void setTitle(String title)
{
    this.title = title;
}
public String getTitle()
{
    return title;
}
public void setReleaseYear(int releaseYear)
{
    this.releaseYear = releaseYear;
}
public int getReleaseYear()
{
    return releaseYear;
}
public void setRentalID(int rentalID)
{
    this.rentalID = rentalID;
}
public int getRentalID()
{
    return rentalID;
}
public void setPrice(int price)
{
    this.price = price;
}
public int getPrice()
{
    return price;
}

}

Mi problema es que estoy confundido sobre cómo crear un método personalizado 'anulado' SetValueAt () 'para llenar las JTables con la información de los Miembros / Elementos. Otro problema son todas las declaraciones if vacías en las clases Listener. No estoy seguro de cómo llevar a cabo su implementación. Si alguien pudiera brindar alguna orientación sobre cualquiera de estos temas, o cualquier otra cosa que me haya perdido, agradecería mucho cualquier comentario.