1. Project Setup

Create a New Project: Follow the steps in my previous response to create a new Java project with the src/server and src/client source folders.

2. Running the Server

Compile and Run: Right-click on the ChatServer.java file. Select "Run 'ChatServer'". IntelliJ will compile and run the server.

3. Running Clients

Compile and Run Clients: Right-click on the Client.java file. Select "Run 'Client'". Important: In the Run/Debug Configuration dialog, leave the "Program arguments" field empty. Click "Run". Repeat this step to create multiple client instances.

4. Chatting

Type Messages: Type messages in each client's console window. Broadcast Messages: The server will broadcast messages to all connected clients. Quit a Client: Type "/quit" in a client's console window to disconnect that client.