How to Open a Socket on Server - In Java Programming

  Socket MyClient;

   MyClient = new Socket("Machine name", PortNumber); 

Machine name is the machine you are trying to open a connection to(ex: ip address or workstation name), and PortNumber is the port (a number) on which the server you are trying to connect to is running.

When selecting a port number, you should note that port numbers between 0 and 1,023 are reserved for privileged users (that is, super user or root). 

These port numbers are reserved for standard services, such as email, FTP, and HTTP.

When selecting a port number for your server, select one that is greater than 1,023! 

With exception handling, the code look like following:

  Socket MyClient;

  try {

       MyClient = new Socket("Machine name", PortNumber);

   }

   catch (IOException e) {

         System.out.println(e);

ServerSocket MyService;

   }

  try {

       MyServerice = new ServerSocket(PortNumber);

   }

   catch (IOException e) {

       System.out.println(e);

   }

When implementing a server you also need to create a socket object from the ServerSocket in order to listen for and accept connections from clients.

  Socket clientSocket = null;

  try {

        serviceSocket = MyService.accept();

    }

  catch (IOException e) {

        System.out.println(e);

   }