Vehicle Rental System

A terminal-based vehicle rental management application developed in Java using a layered architecture (DAO, Service, Model). The system allows users to register, log in, and rent vehicles such as cars, motorcycles, and helicopters.

📌 Features

• User authentication with email and password (hashed using SHA-256)
• Admin-defined vehicles and categories
• Vehicle search and category-based filtering
• Hourly, daily, weekly, and monthly rental options
• Corporate users can only rent vehicles monthly
• Deposit requirement for vehicles over 2 million TL and users under 30 years old
• Paginated vehicle listing
• View rental history
• Terminal-based interactive menu system
• PostgreSQL database with proper relational design

🧱 Technologies Used

• Java 21
• PostgreSQL
• JDBC
• Maven (or manual PostgreSQL JAR inclusion)
• SHA-256 password encryption
• Layered architecture (Model, DAO, Service, Main)
• SQL (with relationships and JOIN operations)

⚙️ How to Run

1. Clone this repository.
2. Import the SQL backup file located at resources/db_backup.sql into your PostgreSQL database.
3. Configure your database connection in the code.
4. Build and run the application using an IDE or terminal.

💾 Database

The system uses a PostgreSQL database with the following tables:

• users
• vehicles
• vehicle_categories
• rentals

Sample data is included in the SQL backup.

🔐 Authentication & Authorization

• Passwords are hashed using SHA-256.
• Only authenticated users can rent vehicles.
• Only admin users can add or manage vehicles.

📝 Rental Rules

• Rental durations: hourly, daily, weekly, monthly
• Corporate users must rent for at least one month
• If a vehicle's price exceeds 2 million TL:
  • User must be over 30 years old
  • A 10% deposit is required

📦 Sample Data

You can find sample users, vehicles, and categories in the SQL backup file.