Question

I am using Java to do the socket programming as below.

Client program is as below:

 Socket MyClient;
    try {
           MyClient = new Socket("Machine name", PortNumber);
    }
    catch (IOException e) {
        System.out.println(e);
    }

Server program is as below:

ServerSocket MyService;
    try {
       MyServerice = new ServerSocket(PortNumber);
        }
        catch (IOException e) {
           System.out.println(e);
        }

Socket clientSocket = null;
    try {
       clientSocket = MyService.accept();
        }
    catch (IOException e) {
       System.out.println(e);
    }

Now my question is if I run more than one thread to open several sockets in one port (as the server code above), how my client program know which socket it is connecting to?

Answer 1

how my client program know which socket it is connecting to?

The question doesn’t make sense. It doesn’t ‘connect to a socket’ at all, it connects to a listening port, and there is only one of those. Your server only accepts one client, so the second and subsequent threads will get an undefined behaviour ranging from a ConnectException to a ConnectionException to nothing, most probably the latter.