Learn Java Networking | Socket, ServerSocket, DatagramSocket & Real Client-Server Application

Published: 15 May 2026
on channel: Code Master

🎯 Hook
Every networked Java application — REST clients, chat servers, game backends — relies on sockets under the hood. This video teaches you to build real TCP and UDP applications from scratch: a multithreaded chat server and a UDP datagram exchange, step by step with working code.

📌 Topics Covered
• Networking fundamentals — IP address, port number, protocol overview
• TCP vs UDP — connection-oriented reliability vs connectionless speed
• Socket class — client-side TCP connection; InputStream/OutputStream access
• ServerSocket class — listening for incoming TCP connections; accept()
• Client-Server communication flow — complete handshake diagram
• Building a TCP echo server — server receives and returns every message
• Building a TCP chat server — multithreaded server handling multiple clients
• Thread-per-client pattern — spawning a thread for each accepted connection
• Closing sockets — why it matters and using try-with-resources
• DatagramSocket — UDP communication without a connection
• DatagramPacket — wrapping data, address, and port for UDP
• UDP sender and receiver — building a UDP message exchange
• Handling timeouts — setSoTimeout() for both TCP and UDP
• InetAddress class — resolving hostnames to IP addresses
• Common networking exceptions and how to handle them

🗒️ What Makes This Video Different
A complete multithreaded TCP chat server is built live in this video — each concept is introduced just before it's needed in the implementation.

⏱️ Timestamps
00:00:00 Socket Programming (TCP)
00:04:22 ServerSocket (The Listener)
00:09:03 ServerSocket Code Walkthrough
00:14:11 DatagramSocket (UDP)
00:19:28 UDP Code Walkthrough
00:24:13 HTTP Connections
00:28:41 HTTP Code Walkthrough
00:33:16 Thank You

👥 Who Is This Video For?
• Java backend developers working on networked applications
• Students covering socket programming in computer networks courses
• Developers preparing for system design and networking interview questions
• Anyone who wants to build a real client-server application in Java

🏷️ Hashtags
#Java #SocketProgramming #JavaNetworking #TCP #UDP #ServerSocket #DatagramSocket #ChatServer #JavaInterview #AdvancedJava

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