Vending Machine GUI Application

This project is a Java-based GUI application that simulates a vending machine. The application provides a graphical interface where users can view, select, and purchase items from different categories (Books, Snacks, and Drinks).

The inventory is managed by a backend system that saves and loads product data from a local file (vending_inventory.csv), ensuring that stock persists between sessions.

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Class Overview

1. UI.java (User Interface)

UI.java is the main class responsible for the entire graphical interface. It handles:

• Window layout and design
• Menu navigation for different product categories
• Purchase handling and user interaction

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2. Varor.java (Abstract Product Class)

Varor.java is an abstract class representing all types of products in the system. Each product contains:

• Name
• Price
• Quantity
• Tax rate (VAT)

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3. Pocketbok.java (Books)

Pocketbok.java is a subclass of Varor representing books. Additional attributes:

• Author
• Genre

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4. Dricka.java (Drinks)

Dricka.java represents drink products and extends Varor. Additional attribute:

• Temperature

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5. Snacks.java (Snacks)

Snacks.java represents snack products and is a subclass of Varor. Additional attributes:

• Whether the snack contains nuts
• Calorie count

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6. StorageManager.java (Inventory Management)

StorageManager.java handles loading and saving inventory data to and from a file. It uses a Map where:

• Key: Product category (String)
• Value: Array of products (Varor[])

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Features in Detail

1. Graphical Design

• Each product category has its own color theme for visual clarity:

  • Blue for Books
  • Green for Snacks
  • Red for Drinks

• Hover effects and cursor changes improve interactivity.

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2. Inventory Management

• Inventory is saved to a file when the program closes.
• Upon restart, inventory is loaded from the file, ensuring stock remains persistent between sessions.
• StorageManager ensures that the inventory in the GUI always matches the saved data.

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3. User Interaction & Purchase Logic

• When a user selects a product, a confirmation dialog appears asking if they want to proceed with the purchase.

• If confirmed:

  • The product stock decreases.
  • The inventory updates automatically.

• If the product is out of stock, a message alerts the user.

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Customizing the Inventory

To customize the default inventory (if no saved inventory file exists), edit the initializeDefaultInventory() method in UI.java. This method sets up default items for Books, Drinks, and Snacks.

Example:

Varor[] drinks = {
    new Dricka("Cola", 20, 10),
    new Dricka("Orange Soda", 20, 8),
};

This allows you to easily add, remove, or modify products before the vending machine is launched.