PLease help! GUI and Data Structure

Question

Hey guys,
It's for my school project.
I have to write codes for GUI program for a order form.
I'm pretty much done with layout and stuff, but I couldn't figure out how to give some regulation(?) on some of the field.
For instantce, I have to regulate a user to type only two letter abbreviation on state(address) field and the Zip field has to be either 5 digit form or XXXXX-XXXX.
I Also have to include code to filter the user input and display error message if they enter wrong information.
Second, how to use actoinevent stuff?
There are three product type: a,b, and c. If "a" be chosen, then the product name associating the "a" product has to be shown on the product name field(I used ComboBox), and the price for that product(for instance a-1) has to be shown on the price field.
Third, It sounds stupid question, but how to display current date on the java program using API?
Fourth, I have to load some of the order from external files(maybe text files) and display into the screen.
Here is the code
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
class orderFormGUI extends JFrame {
     private JButton bSave, bExit, bLoad;
     private JLabel labelTitle;
     private JTextField fieldFName, fieldLName, fieldStreet, fieldCity,
               fieldState, fieldZip;
     private JLabel labelFName, labelLName, labelStreet, labelCity, labelState,
               labelZip;
     private String[] st = { "CA", "TX", "OR", "UT", "NM", "NY", "NY", "GA",
               "IL", "TN", "MN", "WY" };
     private JComboBox comboPType, comboPName;
     private JLabel labelComboPType, labelComboPName;
     private String[] ct = { "Copmuter", "Printer", "Monitor" };
     private String[] cn = { "CMP1100", "CMP1500" };
     private String[] pn = { "PR500", "PR1000" };
     private String[] mn = { "D4000", "D8000" };
     private String[] x;
     private JTextField fieldTotalPrice, fieldProductPrice;
     private JLabel labelTotalPrice, labelProductPrice;
     private JTextField filedQty;
     private JLabel labelQty;
     private JTextField fieldOrderDate, fieldDeliveryDate;
     private JComboBox comboDeliveryOptions;
     private String[] dO = { "5 Days", "10 Days" };
     private JLabel labelOrderDate, labelDeliveryOptions, labelDeliveryDate;
     private ArrayList orderArray;
     private DefaultListModel lmodel;
     public void initComponents() {
          bSave.setActionCommand("Save");
          bLoad.setActionCommand("Load");
          bExit.setActionCommand("Exit");
          bSave.addActionListener(new ButtonListener());
          bLoad.addActionListener(new ButtonListener());
          bExit.addActionListener(new ButtonListener());
     public void ClearFields() {
          // Set all text fields to blank
          fieldFName.setText("");
          fieldLName.setText("");
          fieldStreet.setText("");
          fieldCity.setText("");
          fieldState.setText("");
          fieldZip.setText("");
     public orderFormGUI() {
          orderArray = new ArrayList();
          bSave = new JButton("Save");
          bLoad = new JButton("Load");
          bExit = new JButton("Exit");
          // set up labels and field size for GUI
          labelTitle = new JLabel("Order Form");
          fieldFName = new JTextField("", 30);
          labelFName = new JLabel("First Name: ");
          fieldLName = new JTextField("", 30);
          labelLName = new JLabel("Last Name: ");
          fieldStreet = new JTextField("", 12);
          labelStreet = new JLabel("Street: ");
          fieldCity = new JTextField("", 12);
          labelCity = new JLabel("City: ");
          fieldState = new JTextField("", 2);
          labelState = new JLabel("State: ");
          fieldZip = new JTextField("", 9);
          labelZip = new JLabel("Zip Code: ");
          comboPType = new JComboBox(ct);
          chooseProductName();
          labelComboPType = new JLabel("Product Type");
          comboPName = new JComboBox();
          labelComboPName = new JLabel("Product Name");
          fieldProductPrice = new JTextField("");
          labelProductPrice = new JLabel("Product Price: ");
          fieldTotalPrice = new JTextField("", 12);
          labelTotalPrice = new JLabel("Total Price: ");
          filedQty = new JTextField("", 12);
          labelQty = new JLabel("Quantity: ");
          fieldOrderDate = new JTextField("", 12);
          labelOrderDate = new JLabel("Order Date: ");
          comboDeliveryOptions = new JComboBox(dO);
          labelDeliveryOptions = new JLabel("Delivery Options: ");
          fieldDeliveryDate = new JTextField("", 12);
          labelDeliveryDate = new JLabel("Delivery Date: ");
          TextFieldHandler handler = new TextFieldHandler();
          fieldState.addActionListener(handler);
          // Construct GUI and set layout
          JPanel mine = new JPanel();
          mine.setLayout(null);
          mine.add(labelTitle);
          labelTitle.setBounds(150, 30, 100, 15);
          mine.add(fieldFName);
          fieldFName.setBounds(88, 80, 220, 21);
          mine.add(labelFName);
          labelFName.setBounds(16, 80, 134, 21);
          mine.add(fieldLName);
          fieldLName.setBounds(88, 110, 220, 21);
          mine.add(labelLName);
          labelLName.setBounds(16, 110, 134, 21);
          mine.add(fieldStreet);
          fieldStreet.setBounds(88, 150, 220, 21);
          mine.add(labelStreet);
          labelStreet.setBounds(16, 150, 134, 21);
          mine.add(fieldCity);
          fieldCity.setBounds(88, 180, 220, 21);
          mine.add(labelCity);
          labelCity.setBounds(16, 180, 134, 21);
          mine.add(fieldState);
          fieldState.setBounds(88, 210, 220, 21);
          mine.add(labelState);
          labelState.setBounds(16, 210, 134, 21);
          mine.add(fieldZip);
          fieldZip.setBounds(88, 240, 220, 21);
          mine.add(labelZip);
          labelZip.setBounds(16, 240, 134, 21);
          mine.add(comboPType);
          comboPType.setBounds(120, 280, 220, 21);
          mine.add(labelComboPType);
          labelComboPType.setBounds(16, 280, 134, 21);
          mine.add(comboPName);
          comboPName.setBounds(120,310, 220, 21);
          mine.add(labelComboPName);
          labelComboPName.setBounds(16, 310, 134, 21);
          mine.add(fieldProductPrice);
          fieldProductPrice.setBounds(120, 340, 220, 21);
          fieldProductPrice.setEditable(false);
          mine.add(labelProductPrice);
          labelProductPrice.setBounds(16, 340, 134, 21);
          mine.add(filedQty);
          filedQty.setBounds(120, 370, 220, 21);
          mine.add(labelQty);
          labelQty.setBounds(16, 370, 134, 21);
          mine.add(fieldOrderDate);
          fieldOrderDate.setBounds(120, 430, 220, 21);
          fieldOrderDate.setEditable(false);
          mine.add(labelOrderDate);
          labelOrderDate.setBounds(16, 430, 134, 21);
          mine.add(comboDeliveryOptions);
          comboDeliveryOptions.setBounds(120, 460, 220, 21);
          mine.add(labelDeliveryOptions);
          labelDeliveryOptions.setBounds(16, 460, 134, 21);
          mine.add(fieldDeliveryDate);
          fieldDeliveryDate.setBounds(120, 490, 220, 21);
          fieldDeliveryDate.setEditable(false);
          mine.add(labelDeliveryDate);
          labelDeliveryDate.setBounds(16, 490, 134, 21);
          mine.add(fieldTotalPrice);
          fieldTotalPrice.setBounds(120, 520, 220, 21);
          fieldTotalPrice.setEditable(false);
          mine.add(labelTotalPrice);
          labelTotalPrice.setBounds(16, 520, 134, 21);
          mine.add(bSave);
          bSave.setBounds(16, 550, 100, 21);
          mine.add(bLoad);
          bLoad.setBounds(130, 550, 100, 21);
          mine.add(bExit);
          bExit.setBounds(250, 550, 100, 21);
          this.setContentPane(mine);
          this.pack();
          this.setTitle("Order Form);
          Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
          setSize(380, 630);
     public void chooseProductName(){
          if ((ct).equals(ct[0])){
               comboPName = new JComboBox(cn);
          }else if (ct.equals(ct[1])){
               comboPName = new JComboBox(pn);
          }else if (ct.equals(ct[2])){
               comboPName = new JComboBox(mn);
     public void comboPNameChanged(ItemEvent event){
          if (event.getStateChange() == ItemEvent.SELECTED);
     private void setTestData() {
          orderArray.add(makeOrder("1-100-1000"));
          orderArray.add(makeOrder("1-100-1001"));
          orderArray.add(makeOrder("1-100-1002"));
          for (Order temp : orderArray) {
               if (temp.getOrder().equals("1-100-1000")) {
                    temp.setfName("a");
                    temp.setlName("s");
                    temp.setstreet("4802 Alaska Ave");
                    temp.setcity("Cypress");
                    temp.setzip("90630");
     private Order makeOrder(String order) {
          Order temp = new Order(order);
          return temp;
     private void loadDate(){
     String fn;
     JFileChooser fc = new JFileChooser();
     if(fc.showOpenDialog(this) == JFileChooser.APPROVE_OPTION){
          fn = fc.getSelectedFile().getName();
     if( !new File("objdata.dat").exist() ) {
          setTestData();
          for (Order temp: orderArray());
               lmodel.addElement(temp.getOrder());)
     class Order {
          String orderid, fName, lName, street, city, state, zip;
          public Order(String order) {
               orderid = order;
          public String getOrder() {
               return orderid;
          public String getfName() {
               return fName;
          public void setfName(String fName) {
               this.fName = fName;
          public String getlName() {
               return lName;
          public void setlName(String lName) {
               this.lName = lName;
          public String getstreet() {
               return street;
          public void setstreet(String street) {
               this.street = street;
          public String getcity() {
               return city;
          public void setcity(String city) {
               this.city = city;
          public String getzip() {
               return zip;
          public void setzip(String zip) {
               this.zip = zip;
     private class TextFieldHandler implements ActionListener {
          public void actionPerformed(ActionEvent event) {
               String string = " ";
               if (event.getSource() == fieldState)
                    string = String.format("%s " + "is not correct form.", event
                              .getActionCommand());
               JOptionPane.showMessageDialog(null, string);
               // System.out.println("Please use two letter abbreviation.");
public class Main {
     public static void main(String[] args) {
          JFrame window = new orderFormGUI();
          window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          window.setVisible(true);
{code}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

Cross-posted:
http://forum.java.sun.com/thread.jspa?messageID=10019967