A Client Program – Sockets

• A socket is an object that encapsulates a TCP/IP connection
• There is a socket on both ends of a connection
• Syntax to create a socket in a Java program

  Socket s = new Socket(hostname, portnumber);

• Code to connect to the HTTP port of server, java.sun.com

  final int HTTP_PORT = 80;
  Socket s = new Socket("java.sun.com", HTTP_PORT);

• If it can't find the host, the Socket constructor throws an UnknownHostException