Networking means communication between two or more devices connected in a network. Networking allows sharing of files, data among a group of users. Java allows user to develop a complete system to communicate between certain users.

• Difference between LAN-MAN-WAN.
• What is WWW(World Wide Web)?
• IP Address Concept
• Port Number
• MAC address
• What is a Socket ?
• Networking Protocols
• TCP-IP
• UDP

For networking in Java firstly we should know that how many sockets java allows us to use ? Java allows us to use two sockets:

• Stream Sockets

Stream Sockets use TCP protocol to create a communication between two systems. Here data flows in the form of Continous Streams while the connection is in place.

• Datagram Sockets

Datagram Sockets use UDP protocol in which the packets of information are shared between two systems. It is Connection-less service protocol.

• Different classes through which the connection related information can be accessed are :-

• URL
• URLConnection
• HttpURLConnection
• InetAddress

• Different classes through which the communication could be done between two systems are :-

• DatagramSocket
• ServerSocket
• Socket

• These all classes are included in java.net.* package.

• First Run the Server.java program so that server gets ready to recieve the messages then run the Client.java program.

• Server.java

  

• Client.java

  

• First Run the Server.java program so that server gets ready to recieve the messages then run the Client.java program.

• Server.java

  

• Client.java

  

• First Run the Server.java program so that server gets ready to recieve the messages then run the Client.java program.

• Server.java

  

• Client.java

  

• First Run the Server.java program so that server gets ready to recieve the messages then run the Client.java program.

• Server.java

  

• Client.java