Introduction

This is the final project of our Advanced Programming course at Shahid Beheshti University.
It’s a clone of the famous messaging application Telegram, developed in Java and designed with JavaFX.

The project implements both client-side and server-side logic, featuring real-time messaging, saved messages, contacts, groups, and channels.

---

Objectives

Here is a list of concepts that were practiced and implemented throughout the project:

• Object-Oriented Programming (OOP) concepts
• Database design and integration
• Multithreading and concurrency control
• Socket programming for client-server communication
• Designing graphical user interfaces with JavaFX
• Data handling and persistence with PostgreSQL
• Real-time events and message synchronization

---

Pre Requirements

• Java (JDK 23 or higher)
• PostgreSQL (for database)
• JavaFX SDK (for GUI)
• IntelliJ IDEA
• Gradle as the build system

---

Database design

---

Implementation

The project has 3 main parts:

1. Telegram Client

   • JavaFX-based UI replicating Telegram’s layout (intro, login, chats, sidebar, overlays).
   • Handles sending/receiving requests through sockets.
   • Displays messages, saved chats, groups, and user profiles.

2. Telegram Server

   • Multithreaded server managing client connections concurrently.
   • Processes requests, accesses the database, and returns structured JSON responses.
   • Includes a server log showing all events and queries in real-time.

3. Sockets

   • All client-server communication is handled via sockets.
   • Each request/response follows a structured JSON protocol.
   • Supports multiple users communicating simultaneously.

---

Creating GUI

The GUI was developed entirely with JavaFX, SceneBuilder, and custom CSS.
Features include:

• Light/Dark theme switching
• Responsive sidebar navigation
• Overlays (e.g., Saved Messages, My Profile, Blocked Users)
• Round avatars and icons styled to match Telegram’s UI

---

Database Structures

Implemented with PostgreSQL. Main tables include:

• users – stores account information
• messages – stores chat messages with sender, receiver, timestamp, and status
• private_chat – for one-on-one conversations (including Saved Messages)
• group_chat / channel – for group and channel features
• message_receipts – to track read/delivery status

(SQL schema files are provided in the project repo)

---

Presentation

---

How to Run the Code

1. Clone the repository.
2. Set up the PostgreSQL database using the provided init.sql.
3. In IntelliJ IDEA (with Gradle):
   • Run MainServer first. You should see 🔁 All users set to offline in the console.
   • Run TelegramApplication. The intro screen (with “Start Messaging”) will appear.
4. Login/Register to start chatting.

---

Contributors

• Course Instructor: Dr. Saeed Reza Kheradpisheh
• Project Mentor: Farid Karimi
• Team Members:
  • Asal Lotfi
  • Partow Roshani
  • Shima Morevej

---

Date/Time

Summer of 2025 (Version 1.0)

---

Resources

• JavaFX Documentation
• PostgreSQL Documentation
• Gradle Build Tool
• Telegram Design Reference