Java Sockets

  • It is a logical connecting point between a server and a client on a network.
  • Each socket is given an identification number called port number.
  • Port number takes 2 bytes and can be from 0 to 65,535.
  • To establish a communication between a server and a client is called as Socket programming.
  • We will use a new port number for each new socket.
  • That means every new service on the net should be assigned a new port number.

The following table represents some port numbers which are already used by applications running in our system.


Fig :

  • When a socket at server side is called server socket which is created using ServerSocket class.
  • Similarly a socket at client side is called as Socket which is created using Socket class.
  • Both ServerSocket and Socket class are available in package.
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