Inventory program in Java

[hollywoood]

I am trying to add the Delete button, save and search buttons. I have tried to call my teacher and he is absolutly no help and i have read and reread the text but still have no idea what is going on.........I have the added the add button but now i am stuck. Is there a simple way in completeing this??

Please help

• Due Date: Day 7 [Individual] forum
• Modify the Inventory Program to include an Add button, a Delete button, and a Modify button on the GUI. These buttons should allow the user to perform the corresponding actions on the item name, the number of units in stock, and the price of each unit.An item added to the inventory should have an item number one more than the previous last item.
• Add a Save button to the GUI that saves the inventory to a C:\data\invento ry.dat file.
• Use exception handling to create the directory and file if necessary.
• Add a search button to the GUI that allows the user to search for an item in the inventory by the product name. If the product is not found, the GUI should display an appropriate message. If the product is found, the GUI should display that product’s information in the
GUI. • Post as an attachment

[r035198x]

 
 
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 title;
JLabel quantity;
JLabel price;
JLabel fee;
JLabel totalValue;
 
JTextField nameField = new JTextField(20);
JTextField numberField = new JTextField(20);
JTextField titleField = 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 :");
title = new JLabel("Title    :");
quantity = new JLabel("Quantity :");
price = new JLabel("Price    :");
fee = new JLabel("Fee :");
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(title);
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 title = new JLabel("Title    :");
JLabel quantity = new JLabel("Quantity :");
JLabel price = new JLabel("Price    :");
 
add.add(name); add.add(nameField);
 
add.add(title); add.add(titleField);
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")) {
if(!locked) {
    addItemToArray();
    locked = true;
}
}
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 title = new JLabel("Title    :");
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);
titleField.setText(dvd.getTitle()); titleField.setEditable(false);
add.add(title); add.add(titleField);
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()), titleField.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[i];
}
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());
title.setText("Title: "+ product.getTitle());
quantity.setText("Quantity In Stock: "+ product.getStockQuantity());
price.setText("Item Price: "+ product.getItemPrice());
totalValue.setText("Total: " + product.calculateInventoryValue());
fee.setText("Fee :"+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()), titleField.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
 
 
 

Only two buttons not yet working now. This should not take a day to complete now. I've deliberately stopped there because I'm sure you have lots of questions to ask at this current stage. You must understand everyline of code there first before we finish it off

[r035198x]

 
 
class Product implements Comparable {
 String name;
 double number;
 long stockQuantity;
 double price;
 
 public Product() {
  name = "";
  number = 0.0;
  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(double number) {
  this.number = number;
 }
 public double 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 title;
 public DVD() {
  super(); //Call the constructor in Product
  title = ""; //Add the additonal attribute
 }
 public DVD(String name, int number, long stockQuantity, double price, String title) {
  super(name, number, stockQuantity, price); //Call the constructor in Product
  this.title = title; //Add the additonal attribute
 }
 public void setTitle(String title) {
  this.title = title;
 }
 public String getTitle() {
  return title;
 }
 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() +"\nTitle :"+getTitle()+"\nValue"+calculateInventoryValue();
 }
}
 
 

The Product and DVD classes remain unchanged

[stevedub]

I think I am slowly starting to understand the code, and what it is actually doing. I think my biggest problem is trying to figure out the order in which to present the code. This may take some time to digest, but it looks great, thank you so much.

[ITQUEST]

I think I am slowly starting to understand the code, and what it is actually doing. I think my biggest problem is trying to figure out the order in which to present the code. This may take some time to digest, but it looks great, thank you so much.

Stevedub,
Looks like I am in the same class you are but only in Week 5. I am completely lost and the teacher is NO help!
Can you offer any advice for the Wk 5 Checkpoint? It is the Inventory Program Part 1.

ITQUEST

[ITQUEST]

Stevedub,
Looks like I am in the same class you are but only in Week 5. I am completely lost and the teacher is NO help!
Can you offer any advice for the Wk 5 Checkpoint? It is the Inventory Program Part 1.

ITQUEST

Me again...
I am also wondering how to set up a class. I get how to establish the Java file but the class thing has me confused. What is the difference? I guess I have just been getting by until now, but I can't seem to get it right!
ITQUEST

[stevedub]

Hehe, I feel your pain bro, wait till you get further into the class. Here is the code I have from week 5:

// Product class
 
 
public class Product {
 
    private String title;
    private double item;
    private double stock;
    private double price;
 
    // Constructor to initialize the product information.
    public Product(String title, double item, double stock,
            double price) {
        setTitle(title);
        setItem(item);
        setStock(stock);
        setPrice(price);
 
    }
 
    // Method to get the title
    public String getTitle() {
        return title;
    }
 
    // Method to get the item number
    public double getItem() {
        return item;
    }
 
    //Method to get the stock
    public double getStock() {
        return stock;
    }
 
    //Method to get the price
    public double getPrice() {
        return price;
 
 
 
    }
 
    // Method to set the title name.
    public void setTitle(String title) {
        this.title = title;
    }
 
    // Method to set the item number.
    public void setItem(double item) {
        this.item = item;
    }
 
    // Method to set the stock available.
    public void setStock(double stock) {
        this.stock = stock;
    }
 
    //Method to set the price.
    public void setPrice(double price) {
        this.price = price;
 
    }
    // Method to compute the value of inventory.
    public double getInvValue() {
        return this.stock *this.price;
    }
 
}
 
 
// This is a new class Inventory
// Inventory program
// Main application
 
 
 
public class Inventory
{
    public static void main (String args [])
    {
 
    System.out.println ("Inventory of DVD Movies:\n");
 
        String title = "Beerfest";
        double item = 1;
        double stock = 15;
        double price = 22.50;
        double value;
 
    Product product = new Product (title, item, stock, price);
 
    System.out.printf( "%s%18s\n", "DVD Title:", product.getTitle() );
 
    System.out.printf( "%s%16s\n", "Item #:", product.getItem() );
 
    System.out.printf( "%s%8s\n", "Number in Stock:" , product.getStock() );
 
    System.out.printf( "%s%18s\n", "Price:", product.getPrice() );
 
 
 
    System.out.printf( "%s%9s\n", "Inventory Value:", product.getInvValue() );
 
    }
}
 

[stevedub]

Let me know if you have any questions about the code.

[ITQUEST]

Let me know if you have any questions about the code.

Do you post the first half as your .java and the second as your .class to get it to run? I understand how you have it written. I can read the material and understand it when I see it, but putting the two together is the challenge for me.

I have to say that all of the classes so far have been fine, but this one is bad. Do you mind me asking questions along the way or will you leave this forum after you complete the course?

ITQUEST

[ITQUEST]

Do you post the first half as your .java and the second as your .class to get it to run? I understand how you have it written. I can read the material and understand it when I see it, but putting the two together is the challenge for me.

I have to say that all of the classes so far have been fine, but this one is bad. Do you mind me asking questions along the way or will you leave this forum after you complete the course?

ITQUEST

I run it and get the following error:

NoClassDefFound Error: Product

Any suggestions?

[r035198x]

I run it and get the following error:

NoClassDefFound Error: Product

Any suggestions?

.java classes are compiled to into .class files. If you have a .java file called Product.java, when you compile it a .class is created for every class in the file Product.java if there are no errors. In this case you are getting this error because there is no class file called Product.class so you must compile the Product class first.