Need help with search function in my program

Question

Hello all, some of you may remeber me from my previous inventory programs. Well I am finally on my last one and I need to add a search option to the code. Here is the class that will contain that option.
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Inventory2 extends JFrame implements ActionListener {
//Utility class for displaying the picture
//If we are going to use a class/method/variable inside that class only, we declare it private in that class
private class MyPanel extends JPanel {
ImageIcon image = new ImageIcon("Sample.jpg");
int width = image.getIconWidth();
int height = image.getIconHeight();
long angle = 30;
public MyPanel(){
super();
public void paintComponent(Graphics g){
     super.paintComponent(g);
     Graphics2D g2d = (Graphics2D)g;
     g2d.rotate (Math.toRadians(angle), 60+width/2, 60+height/2);
     g2d.drawImage(image.getImage(), 60, 60, this);
     g2d.dispose();
}//end class MyPanel
int currentIndex; //Currently displayed Item
Product[] supplies = new Product[4];
JLabel name ;
JLabel number;
JLabel rating;
JLabel quantity;
JLabel price;
JLabel fee;
JLabel totalValue;
JTextField nameField = new JTextField(20);
JTextField numberField = new JTextField(20);
JTextField ratingField = new JTextField(20);
JTextField quantityField = new JTextField(20);
JTextField priceField = new JTextField(20);
JPanel display;
JPanel displayHolder;
JPanel panel;
boolean locked = false; //Notice how I've used this flag to keep the interface clean
public Inventory2() {
makeTheDataItems();
setSize(700, 500);
setTitle("Inventory Program");
//make the panels
display = new JPanel();
JPanel other = new JPanel();
other.setLayout(new GridLayout(2, 1));
JPanel picture = new MyPanel();
JPanel buttons = new JPanel();
JPanel centerPanel = new JPanel();
displayHolder = new JPanel();
display.setLayout(new GridLayout(7, 1));
//other.setLayout(new GridLayout(1, 1));
//make the labels
name = new     JLabel("Name :");
number = new JLabel("Number :");
rating = new JLabel("Rating     :");
quantity = new JLabel("Quantity :");
price = new JLabel("Price     :");
fee = new JLabel("Restocking Fee (5%) :");
totalValue = new JLabel("Total Value :");
//Use the utility method to make the buttons
JButton first = makeButton("First");
JButton next = makeButton("Next");
JButton previous = makeButton("Previous");
JButton last = makeButton("Last");
JButton search = makeButton("Search");
//Other buttons
JButton add = makeButton("Add");
JButton modify = makeButton("Modify");
JButton delete = makeButton("Delete");
JButton save = makeButton("Save");
JButton exit = makeButton("Exit");
//Add the labels to the display panel
display.add(name);
display.add(number);
display.add(rating);
display.add(quantity);
display.add(price);
display.add(fee);
//add the buttons to the buttonPanel
buttons.add(first);
buttons.add(previous);
buttons.add(next);
buttons.add(last);
buttons.add(search);
//Add the picture panel and display to the centerPanel
displayHolder.add(display);
centerPanel.setLayout(new GridLayout(2, 1));
centerPanel.add(picture);
centerPanel.add(displayHolder);
other.add(buttons);
JPanel forAdd = new JPanel(); // add the other buttons to this panel
forAdd.add(add);
forAdd.add(modify);
forAdd.add(delete);
forAdd.add(save);
forAdd.add(exit);
other.add(forAdd);
//Add the panels to the frame
getContentPane().add(centerPanel, "Center");
getContentPane().add(other, "South");
this.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
setVisible(true);
private void makeTheDataItems () {
Product p1 = new DVD("The one", 001, 200, 100, "The one");
Product p2 = new DVD("Once upon a time in China V", 002, 500, 10000, "Once upon a time in China V");
Product p3 = new DVD("Rat Race", 003, 100, 3000, "Rat Race");
Product p4 = new DVD("The Man in the Iron Mask", 004, 3000, 9000, "The Man in the Iron Mask");
supplies[0] = p1;
supplies[1] = p2;
supplies[2] = p3;
supplies[3] = p4;
//Utility method for creating and dressing buttons
private JButton makeButton(String label) {
JButton button = new JButton(label);
button.setPreferredSize(new Dimension(100, 25));
button.setActionCommand(label);
button.addActionListener(this);
return button;
private void addItem() {
panel = new JPanel();
JPanel add = new JPanel();
add.setLayout(new GridLayout(7, 2));
JButton addIt = makeButton("Add Item");
JLabel name = new JLabel("Name :");
JLabel rating = new JLabel("Rating     :");
JLabel quantity = new JLabel("Quantity :");
JLabel price = new JLabel("Price     :");
add.add(name); add.add(nameField);
add.add(rating); add.add(ratingField);
add.add(quantity); add.add(quantityField);
add.add(price); add.add(priceField);
panel.add(add);
JPanel forAddIt = new JPanel();
forAddIt.add(addIt);
panel.add(forAddIt);
displayHolder.remove(display);
displayHolder.add(panel);
//display = panel;
this.setVisible(true);
public static void main( String args[]) {
new Inventory2().displayFirst(); //The main method should not have too much code
} // end main method
public void actionPerformed(ActionEvent event) {
  String command = event.getActionCommand(); //This retrieves the command that we set for the button
  //Always compare strings using the .equals method and not using ==
  if(command.equals("First")) {
   if(!locked) {
     displayFirst();
  else if(command.equals("Next")) {
   if(!locked) {
     displayNext();
  else if(command.equals("Previous")) {
   if(!locked) {
     displayPrevious();
  else if(command.equals("Last")) {
   if(!locked) {
     displayLast();
  else if(command.equals("Exit")) {
   this.dispose();
   System.exit(0);
  else if(command.equals("Add")) {
   if(!locked) {
     addItem();
     locked = true;
  else if(command.equals("Add Item")) {
   addItemToArray();
  else if(command.equals("Modify")) {
   if(!locked) {
     modify();
     locked = true;
  else if(command.equals("Update")) {
      if(!locked) {
     modifyItemInArray();
     locked = true;
  else if(command.equals("Delete")) {
   if(!locked) {
     DVD dvd = (DVD)supplies[currentIndex];
        int confirm = JOptionPane.showConfirmDialog(this, "Are you sure you want to delete item "+dvd.getItemNumber());
            if(confirm == JOptionPane.YES_OPTION) {
      removeItemAt(currentIndex);
      displayFirst();
private void modify() {
DVD dvd = (DVD)supplies[currentIndex];
panel = new JPanel();
JPanel add = new JPanel();
add.setLayout(new GridLayout(7, 2));
JButton update = makeButton("Update");
JLabel number = new JLabel("Number :");
JLabel name = new JLabel("Name :");
JLabel rating = new JLabel("Rating     :");
JLabel quantity = new JLabel("Quantity :");
JLabel price = new JLabel("Price     :");
add.add(number);
numberField.setText(""+dvd.getItemNumber()); numberField.setEditable(false); add.add(numberField);
add.add(name);
nameField.setText(dvd.getItemName()); add.add(nameField);
ratingField.setText(dvd.getRating()); ratingField.setEditable(false);
add.add(rating); add.add(ratingField);
add.add(quantity);
quantityField.setText(""+dvd.getStockQuantity());
add.add(quantityField);
add.add(price);
add.add(priceField); priceField.setText(""+dvd.getItemPrice());
panel.add(add);
JPanel forAddIt = new JPanel();
forAddIt.add(update);
panel.add(forAddIt);
displayHolder.remove(display);
displayHolder.add(panel);
//display = panel;
      this.setVisible(true);
private void addItemToArray() {
Product p = new DVD(nameField.getText(), supplies.length + 1, Long.parseLong(quantityField.getText()),
Double.parseDouble(priceField.getText()), ratingField.getText());
//Extend size of array by one first
Product[] ps = new Product[supplies.length + 1];
for(int i = 0; i < ps.length-1; i++) {
ps[i] = supplies;
ps[supplies.length] = p;
supplies = ps;
displayHolder.remove(panel);
displayHolder.add(display);
displayLast();
this.setVisible(false);
this.setVisible(true);
//Utility method to ease the typing and reuse code
//This method reduces the number of lines of our code
private void displayItemAt(int index) {
DVD product = (DVD)supplies[index];
name.setText("Item Name: "+ product.getItemName());
number.setText("Item Number: "+ product.getItemNumber());
rating.setText("Rating: "+ product.getRating());
quantity.setText("Quantity In Stock: "+ product.getStockQuantity());
price.setText("Item Price: "+ product.getItemPrice());
totalValue.setText("Total: " + product.calculateInventoryValue());
fee.setText("Restocking Fee (5%) :"+product.calculateRestockFee());
locked = false;
this.repaint();
this.setVisible(true);
private void modifyItemInArray() {
Product p = new DVD(nameField.getText(), supplies.length + 1, Long.parseLong(quantityField.getText()),
Double.parseDouble(priceField.getText()), ratingField.getText());
supplies[currentIndex] = p;
displayHolder.remove(panel);
displayHolder.add(display);
     displayItemAt(currentIndex);
this.setVisible(false);
this.setVisible(true);
private void removeItemAt(int index) {
Product[] temp = new Product[supplies.length-1];
int counter = 0;
for(int i = 0; i < supplies.length;i++) {
if(i == index) { //skip the item to delete
else {
     temp[counter++] = supplies[i];
supplies = temp;
public void displayFirst() {
displayItemAt(0);
currentIndex = 0;
public void displayNext() {
if(currentIndex == supplies.length-1) {
displayFirst();
currentIndex = 0;
else {
displayItemAt(currentIndex + 1);
currentIndex++;
public void displayPrevious() {
if(currentIndex == 0) {
displayLast();
currentIndex = supplies.length-1;
else {
displayItemAt(currentIndex - 1);
currentIndex--;
public void displayLast() {
displayItemAt(supplies.length-1);
currentIndex = supplies.length-1;
}//end class Inventory2
I am not sure where to put it and how to set it up. If you guys need the other two classes let me know. Thanks in advanced.

Answer 1

Here are the other two classes:
import java.util.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
class Product implements Comparable {
String name;
int number;
long stockQuantity;
double price;
public Product() {
  name = "";
      number = 0;
      stockQuantity = 0L;
      price = 0.0;
public Product(String name, int number, long stockQuantity, double price) {
  this.name = name;
      this.number = number;
      this.stockQuantity = stockQuantity;
      this.price = price;
     public void setItemName(String name) {
  this.name = name;
public String getItemName() {
  return name;
public void setItemNumber(int number) {
  this.number = number;
public int getItemNumber() {
  return number;
public void setStockQuantity(long quantity) {
  stockQuantity = quantity;
public long getStockQuantity() {
  return stockQuantity;
public void setItemPrice(double price) {
  this.price = price;
public double getItemPrice() {
  return price;
public double calculateInventoryValue() {
  return getItemPrice() * getStockQuantity();
public int compareTo (Object o) {
  Product p = (Product)o;
  return name.compareTo(p.getItemName());
public String toString() {
  return "Name :"+getItemName() + "\nNumber"+number+"\nPrice"+price+"\nQuantity"+stockQuantity + "\nValue :"+calculateInventoryValue();
class DVD extends Product implements Comparable {
private String rating;
public DVD() {
  super(); //Call the constructor in Product
  rating = ""; //Add the additonal attribute
public DVD(String name, int number, long stockQuantity, double price, String rating) {
  super(name, number, stockQuantity, price); //Call the constructor in Product
  this.rating = rating; //Add the additonal attribute
     public void setRating(String rating) {
  this.rating = rating;
public String getRating() {
  return rating;
public double calculateInventoryValue() {
  return getItemPrice() * getStockQuantity() + getItemPrice()*getStockQuantity()*0.05;
public double calculateRestockFee() {
  return getItemPrice() * 0.05;
public int compareTo (Object o) {
  Product p = (Product)o;
  return getItemName().compareTo(p.getItemName());
public String toString() {
  return "Name :"+getItemName() + "\nNumber"+getItemNumber()+"\nPrice"+getItemPrice()+"\nQuantity"+getStockQuantity() +"\nRating :"+getRating()+"\nValue"+calculateInventoryValue();
}You should be able to search through these items, and any other items that have been added to the program.