I am creating a store front application in Java. I have my main driver program with 5 different classes it is using. I cannot get it to print out my inventory I have listed in my JSON file. What am I doing wrong or what am I missing here? My FileService class is at the bottom from where the driver is calling the method. I think that is where my problem is.
package app;
import java.io.IOException;
import java.util.*;
public class StoreFront {
static InventoryManager inventoryManager = new InventoryManager();
static ShoppingCart shoppingCart = new ShoppingCart();
static Scanner scnr = new Scanner(System.in);
// static FileService fileService = new FileService();
private static void viewProducts() {
inventoryManager.displaySalableProducts();
}
private static void purchaseProducts() {
System.out.print("Enter the name of the product you want to purchase: ");
scnr.nextLine(); // Consume newline character
String productName = scnr.nextLine();
SalableProduct productToPurchase = inventoryManager.findProductByName(productName);
if (productToPurchase == null) {
System.out.println("Product not found.");
} else {
if (productToPurchase.getQty() > 0) {
shoppingCart.addItem(productToPurchase);
productToPurchase.setQty(productToPurchase.getQty() - 1);
System.out.println("Product purchased successfully.");
} else {
System.out.println("Product is out of stock.");
}
}
}
private static void returnProducts() {
shoppingCart.returnProduct(null);
}
public static void main(String[] args) throws IOException{
/*
* old method of manually adding inventory
inventoryManager.addProduct(new Food("Goji Berry", "bright orange-red berry that comes from a shrub native to Asia", 8.32, 496));
inventoryManager.addProduct(new Potion("Elixir", "Potion that grants eternal life", 3469.00, 4));
inventoryManager.addProduct(new Helmet("Kabuto", "Ancient Japanese war helemt", 999.99, 43));
inventoryManager.addProduct(new Tomahawk("Polished Tomahawk", "Benjamin Martins Tomahawk", 567.00, 1));
inventoryManager.addProduct(new Shield("Heater Shield", "Used in the Middle Ages by knights and soldiers", 269.00, 57));
inventoryManager.addProduct(new Sword("Katana", "single-edged sword used by Japanese samurai", 4420.00, 21));
*/
inventoryManager.initializeInventoryFromFile("inventory.json");
System.out.println("Welcome to the Game Store \n");
System.out.println("Please select an option from the menu");
System.out.println("***************************************");
System.out.println("************MAIN MENU ******************\n");
while (true) {
System.out.println("Enter one of the following:\n\n"+
"'1' : View Products\n"+
"'2' : Purchase Products\n"+
"'3' : Return Products\n"+
"'4' : Exit");
int menuChoice = scnr.nextInt();
switch(menuChoice) {
case 1:
viewProducts();
break;
case 2:
purchaseProducts();
break;
case 3:
returnProducts();
break;
case 4:
System.out.println("Thank you for coming by. Please come again.");
System.exit(0);
break;
} //scnr.close();
}
}
}
File Service Class method
public static ArrayList<SalableProduct> loadProductsFromFile(String filename) {
ArrayList<SalableProduct> products = new ArrayList<SalableProduct>();
try {
File file = new File(filename);
Scanner scnr = new Scanner(file);
ObjectMapper objectMapper = new ObjectMapper();
while (scnr.hasNext()) {
String json = scnr.nextLine();
SalableProduct product = objectMapper.readValue(json, SalableProduct.class);
products.add(product);
}
scnr.close();
} catch (IOException e) {
e.printStackTrace();
} return products;
}
I have tried running my program in debug mode and watch all the steps closely but have not had any luck. It works when I hardcode/manually enter the inventory but hasn't since I implemented the JSON file and methods to call it.
Here is the SalableProduct Class
public class SalableProduct {
/**
* placeholder for items to sell in store
*/
private String name;
private String description;
private double price;
private int qty;
public String getName() {
return name;
}
public SalableProduct(String name, String description, double price, int qty) {
super();
this.name = name;
this.description = description;
this.price = price;
this.qty = qty;
}
public String getDescription() {
return description;
}
public void setName(String name) {
this.name = name;
}
public void setDescription(String description) {
this.description = description;
}
public void setPrice(double price) {
this.price = price;
}
public double getPrice() {
return price;
}
public int getQty() {
return qty;
}
public void setQty(int qty) {
this.qty = qty;
}
public SalableProduct() {
name = "";
description = "";
price = 0;
qty = 0;
}
}
Here is my JSON file
{"name":"Goji Berry","description":"bright orange-red berry that comes from a shrub native to Asia","price":8.32,"qty":496}
{"name":"Elixir","description":"Potion that grants eternal life","price":3469.00,"qty":4}
{"name":"Kabuto","description":"Ancient Japanese war helmet","price":999.99,"qty":43}
{"name":"Polished Tomahawk","description":"Benjamin Martins Tomahawk","price":567.00,"qty":1}
{"name":"Heater Shield","description":"Used in the Middle Ages by knights and soldiers","price":269.00,"qty":57}
{"name":"Katana","description":"single-edged sword used by Japanese samurai","price":4469.00,"qty":21}
Here is the displaySalable products
for (SalableProduct product : products) {
System.out.println(product.getName() + " - " + product.getDescription() + " - Price: $" + product.getPrice()
+ " - Quantity: " + product.getQty());
}
}
My issue was residing in my Product class, I had previously had and was using SalableProduct as my super class but Product needed to be on its own. I also had to add generics to all of my classes. So now my code is this.
package app;
public class Product <T extends SalableProduct> {
public Product(String name, String description, double price, int qty) {
}
}
I also added this line to my StoreFront class in the main method.
inventoryManager.initializeInventoryFromFile("inventory.json");
here is my method for initializeInventoryFromFile method in my InventoryManager class.
public void initializeInventoryFromFile(String filename) {
ArrayList<T> products = (ArrayList<T>) FileService.loadProductsFromFile("inventory.json");
for (T product : products) {
addProduct( product);
}
}