Inventory System Java

Technologies Used

Overview

This is a Java Swing desktop application designed to manage inventory, user accounts, and sales transactions for a retail store. It features role-based access control and uses a modern look-and-feel library for its UI.

Architecture and Structure

The application follows a modular structure, separating the UI from the core logic.

• Application UI Layer (app/): Contains all the Swing forms (.java and .form files), including main frames like Login.java, CheckoutPanel.java, and InventoryManagement.java, as well as various dialogs for adding/editing data.
• Core Logic Layer (libs/core/): Contains the business logic and data management classes.
  • Accounts.java & Inventory.java: Manage collections of User and Product objects, respectively.
  • AppStateManager.java: A utility class that handles the loading and saving of the application’s state (inventory, accounts, cart) by reading/writing serialized objects to .dat files.
  • Cart.java, Product.java, User.java: Model classes representing the main entities of the system.
• Error Handling Layer (libs/errors/): Defines custom exception classes like InvalidUserPassword and OverdrawError for robust error handling.

Key Features

• User Authentication and Roles: A login screen differentiates between Admin (full access) and User/Cashier (limited access) roles.
• Full-Featured Inventory and User Management: Complete CRUD functionality for both products and user accounts (for admins).
• Data Persistence: All application data is saved to and loaded from .dat files using Java Object Serialization, ensuring data is retained between application runs.