JAMILA KABIR MATO 20220642 HASEENA ABDULLAHI SADIQ 20220600 INVENTORY APP

JAMILA KABIR MATO 20220642 HASEENA ABDULLAHI SADIQ 20220600/InventoryApp 2/InventoryApp 2/README.md

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+# Inventory Management System Application
+
+**Authors:**  
+- Jamila Mato (ID: 20220642)  
+- Haseena Abdullahi (ID: 20220600)  
+
+**Course:** Object-Oriented Programming  
+
+## Project Description
+
+This is a simple Java console application that simulates an Inventory Management System. It allows users to:
+
+- Add new products
+- View the entire inventory
+- Update stock levels
+- Delete products
+
+The system is designed using **Object-Oriented Programming (OOP)** principles such as:
+
+- **Encapsulation:** Each product's data is kept private within the `Product` class with access provided through getter/setter methods.
+- **Association:** The `Inventory` class maintains a collection (list) of `Product` objects and operates on them.
+- **Modularity:** Classes are organized by purpose and package to enhance readability and maintainability.
+
+## Project Structure
+
+```
+InventoryApp/
+├── src/
+│   └── com/
+│       └── inventory/
+│           ├── model/
+│           │   ├── Product.java
+│           │   └── Inventory.java
+│           └── main/
+│               └── InventoryApp.java
+└── README.md
+```
+
+## How to Compile and Run
+
+### 1. Open Terminal or Command Prompt.
+
+### 2. Navigate to the `src` directory of the project:
+```bash
+cd path/to/InventoryApp/src
+```
+
+### 3. Compile all Java files:
+```bash
+javac com/inventory/model/*.java com/inventory/main/InventoryApp.java
+```
+
+### 4. Run the application:
+```bash
+java com.inventory.main.InventoryApp
+```
+
+## Example Use
+
+```text
+=== Inventory Management System ===
+1. Add New Product
+2. View Inventory
+3. Update Stock
+4. Delete Product
+5. Exit
+Choose an option (1-5):
+```
+
+## Notes
+
+- Input validation is included to handle invalid numeric input.
+- Stock updates prevent negative values.
+- Product IDs must be unique.

JAMILA KABIR MATO 20220642 HASEENA ABDULLAHI SADIQ 20220600/InventoryApp 2/InventoryApp 2/src/com/inventory/main/InventoryApp.java

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+package com.inventory.main;
+
+import com.inventory.model.Inventory;
+import com.inventory.model.Product;
+
+import java.util.Scanner;
+
+public class InventoryApp {
+    public static void main(String[] args) {
+        Inventory inventory = new Inventory();
+        Scanner scanner = new Scanner(System.in);
+        boolean running = true;
+
+        while (running) {
+            System.out.println("\n=== Inventory Management System ===");
+            System.out.println("1. Add New Product");
+            System.out.println("2. View Inventory");
+            System.out.println("3. Update Stock");
+            System.out.println("4. Delete Product");
+            System.out.println("5. Exit");
+            System.out.print("Choose an option (1-5): ");
+
+            try {
+                int choice = Integer.parseInt(scanner.nextLine());
+                switch (choice) {
+                    case 1:
+                        System.out.print("Enter Product ID: ");
+                        String id = scanner.nextLine();
+                        System.out.print("Enter Product Name: ");
+                        String name = scanner.nextLine();
+                        System.out.print("Enter Product Description: ");
+                        String desc = scanner.nextLine();
+                        System.out.print("Enter Product Price: ");
+                        double price = Double.parseDouble(scanner.nextLine());
+                        System.out.print("Enter Initial Stock Quantity: ");
+                        int qty = Integer.parseInt(scanner.nextLine());
+
+                        Product product = new Product(id, name, desc, price, qty);
+                        inventory.addProduct(product);
+                        break;
+
+                    case 2:
+                        inventory.displayInventory();
+                        break;
+
+                    case 3:
+                        System.out.print("Enter Product ID: ");
+                        String updateId = scanner.nextLine();
+                        System.out.print("Enter Quantity Change (positive to add, negative to remove): ");
+                        int change = Integer.parseInt(scanner.nextLine());
+                        inventory.updateStock(updateId, change);
+                        break;
+
+                    case 4:
+                        System.out.print("Enter Product ID to delete: ");
+                        String deleteId = scanner.nextLine();
+                        inventory.deleteProduct(deleteId);
+                        break;
+
+                    case 5:
+                        running = false;
+                        System.out.println("Exiting the application...");
+                        break;
+
+                    default:
+                        System.out.println("Invalid option. Please choose between 1-5.");
+                }
+            } catch (NumberFormatException e) {
+                System.out.println("Invalid input. Please enter the correct data type.");
+            }
+        }
+
+        scanner.close();
+    }
+}

JAMILA KABIR MATO 20220642 HASEENA ABDULLAHI SADIQ 20220600/InventoryApp 2/InventoryApp 2/src/com/inventory/model/Inventory.java

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+package com.inventory.model;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Inventory {
+    private List<Product> products;
+
+    public Inventory() {
+        products = new ArrayList<>();
+    }
+
+    public void addProduct(Product product) {
+        for (Product p : products) {
+            if (p.getProductId().equalsIgnoreCase(product.getProductId())) {
+                System.out.println("Product with ID " + product.getProductId() + " already exists.");
+                return;
+            }
+        }
+        products.add(product);
+        System.out.println("Product added successfully.");
+    }
+
+    public Product getProductById(String productId) {
+        for (Product p : products) {
+            if (p.getProductId().equalsIgnoreCase(productId)) {
+                return p;
+            }
+        }
+        return null;
+    }
+
+    public List<Product> getAllProducts() {
+        return products;
+    }
+
+    public void updateStock(String productId, int quantityChange) {
+        Product p = getProductById(productId);
+        if (p != null) {
+            int newQuantity = p.getStockQuantity() + quantityChange;
+            if (newQuantity < 0) {
+                System.out.println("Cannot reduce stock below 0.");
+            } else {
+                p.setStockQuantity(newQuantity);
+                System.out.println("Stock updated successfully.");
+            }
+        } else {
+            System.out.println("Product not found.");
+        }
+    }
+
+    public void deleteProduct(String productId) {
+        Product p = getProductById(productId);
+        if (p != null) {
+            products.remove(p);
+            System.out.println("Product deleted successfully.");
+        } else {
+            System.out.println("Product not found.");
+        }
+    }
+
+    public void displayInventory() {
+        if (products.isEmpty()) {
+            System.out.println("Inventory is empty.");
+        } else {
+            for (Product p : products) {
+                System.out.println(p);
+            }
+        }
+    }
+}

JAMILA KABIR MATO 20220642 HASEENA ABDULLAHI SADIQ 20220600/InventoryApp 2/InventoryApp 2/src/com/inventory/model/Product.java

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+package com.inventory.model;
+
+public class Product {
+    private String productId;
+    private String name;
+    private String description;
+    private double price;
+    private int stockQuantity;
+
+    public Product(String productId, String name, String description, double price, int stockQuantity) {
+        this.productId = productId;
+        this.name = name;
+        this.description = description;
+        this.price = price;
+        this.stockQuantity = stockQuantity;
+    }
+
+    public String getProductId() {
+        return productId;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public double getPrice() {
+        return price;
+    }
+
+    public int getStockQuantity() {
+        return stockQuantity;
+    }
+
+    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 void setStockQuantity(int stockQuantity) {
+        this.stockQuantity = stockQuantity;
+    }
+
+    @Override
+    public String toString() {
+        return "Product ID: " + productId +
+               ", Name: " + name +
+               ", Description: " + description +
+               ", Price: $" + price +
+               ", Stock Quantity: " + stockQuantity;
+    }
+}