Tutorial Overview: Build a Simple Inventory Management Console App in Java

What You’ll Learn

• Defining and using Java classes and objects
• Implementing collections to manage data
• Handling user input and output via the console
• Applying control structures for program flow

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Step 1: Define the Product Class

Begin by creating a Product class to encapsulate product details.

javaCopyEditpublic class Product {
    private String name;
    private int quantity;

    public Product(String name, int quantity) {
        this.name = name;
        this.quantity = quantity;
    }

    // Getters and setters
    public String getName() { return name; }
    public int getQuantity() { return quantity; }
    public void setQuantity(int quantity) { this.quantity = quantity; }
}

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Step 2: Create the Inventory Class

Next, develop an Inventory class to manage a collection of products.w3resource

javaCopyEditimport java.util.ArrayList;

public class Inventory {
    private ArrayList<Product> products = new ArrayList<>();

    public void addProduct(Product product) {
        products.add(product);
    }

    public void removeProduct(String name) {
        products.removeIf(p -> p.getName().equalsIgnoreCase(name));
    }

    public void checkLowInventory(int threshold) {
        for (Product p : products) {
            if (p.getQuantity() <= threshold) {
                System.out.println(p.getName() + " is low on stock: " + p.getQuantity());
            }
        }
    }

    public void displayInventory() {
        for (Product p : products) {
            System.out.println(p.getName() + " - Quantity: " + p.getQuantity());
        }
    }
}

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Step 3: Develop the Main Application

Finally, implement the main class to interact with the user.w3resource

javaCopyEditimport 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("\nInventory Management System");
            System.out.println("1. Add Product");
            System.out.println("2. Remove Product");
            System.out.println("3. Check Low Inventory");
            System.out.println("4. Display Inventory");
            System.out.println("5. Exit");
            System.out.print("Choose an option: ");
            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume newline

            switch (choice) {
                case 1:
                    System.out.print("Enter product name: ");
                    String name = scanner.nextLine();
                    System.out.print("Enter quantity: ");
                    int qty = scanner.nextInt();
                    inventory.addProduct(new Product(name, qty));
                    break;
                case 2:
                    System.out.print("Enter product name to remove: ");
                    String removeName = scanner.nextLine();
                    inventory.removeProduct(removeName);
                    break;
                case 3:
                    System.out.print("Enter low stock threshold: ");
                    int threshold = scanner.nextInt();
                    inventory.checkLowInventory(threshold);
                    break;
                case 4:
                    inventory.displayInventory();
                    break;
                case 5:
                    running = false;
                    break;
                default:
                    System.out.println("Invalid option.");
            }
        }

        scanner.close();
    }
}

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Sample Output

mathematicaCopyEditInventory Management System
1. Add Product
2. Remove Product
3. Check Low Inventory
4. Display Inventory
5. Exit
Choose an option: 1
Enter product name: Widget
Enter quantity: 50

Inventory Management System
1. Add Product
2. Remove Product
3. Check Low Inventory
4. Display Inventory
5. Exit
Choose an option: 4
Widget - Quantity: 50

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Additional Resources

For a more in-depth exploration and GUI-based implementation, consider the following resources:

• Project Gurukul’s Java Inventory Management System: This project utilizes Java Swing for the user interface and integrates with a MySQL database for data management. It provides features like adding products, managing categories, and tracking inventory and sales. Project Gurukul
• Tutusfunny’s Inventory System Using Java: This tutorial guides you through building a MilkBar Inventory Management System using Java, focusing on practical implementation and user interaction. tutussfunny.com