Modern Java Multi-Client Chat Application

A real-time, multi-client chat application built in Java featuring:

• Rounded chat bubbles like modern messaging apps
• User list panel displaying all connected users
• Unique colors for each user
• Two-sided real-time chat: messages appear for all clients, including the sender
• Notifications for user join/leave
• GUI built with Swing

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Features

• Two-sided Chat: All clients see every message
• Rounded Chat Bubbles: Color-coded messages per user
• User List Panel: Shows online users dynamically
• Notifications: Join/Leave messages
• Send via Enter Key or Send Button
• Menu Options: Clear Chat / Exit
• Multi-client support with TCP sockets

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Screenshots & Demo

Chat Window Two-sided Messaging User List Panel & Option

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Getting Started

Prerequisites

• Java JDK 8 or higher
• PowerShell / Terminal
• Optional: IDE like VSCode, IntelliJ, or Eclipse

Installation

1. Clone this repository:

git clone https://github.com/ZannatulRaian/modern-java-chat-app.git
cd modern-java-chat-app

Compile Java files:

javac ChatServer.java
javac ChatClient.java
Start the server:

java ChatServer

Start clients in separate terminals:

java ChatClient
Enter unique usernames and chat!

Optional: Auto-launch with PowerShell

.\runChatApp.ps1

This script launches the server and multiple clients automatically.

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How It Works

• Server: Accepts connections, broadcasts messages, updates user list.
• Client: Connects to server, sends messages, receives broadcasts.
• GUI: Displays messages as colored, rounded bubbles; updates user list dynamically.
• Color Mapping: Each user has a unique color for easy identification.

Tech Stack

• Language: Java
• Networking: TCP sockets
• GUI: Swing
• Threading: Multi-threaded client handling

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Future Improvements

• Private messaging between users
• File sharing in chat
• Persistent message history
• Customizable themes
• Emoji support
• Message encryption

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License

This project is licensed under the MIT License.

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