Server Logic:

Remember that your server is blocked, and waiting, for client joke/proverb input.

But, you also want it blocked, and waiting, for administration input.

It is not possible to block a single thread in two places at once. Thus, it is a certainty that you will have to make an asynchronous call to start a blocking wait for adminstration input, before sending on the main program thread into the blocking wait for client input.

Something like the following code will do this:

  public static void main(String a[]) throws IOException {
    int q_len = 6; /* Number of requests for OpSys to queue */
    int port = 4545;
    Socket sock;

    AdminLooper AL = new AdminLooper(); // create a DIFFERENT thread
    Thread t = new Thread(AL);
    t.start();  // ...and start it, waiting for administration input
    
    ServerSocket servsock = new ServerSocket(port, q_len);
        
    System.out.println("Clark Elliott's Joke server starting up at port 4545.\n");
    while (controlSwitch) {
      // wait for the next client connection:
      sock = servsock.accept();
      new Worker (sock).start();
    }
  }


and


class AdminLooper implements Runnable {
  public static boolean adminControlSwitch = true;

  public void run(){ // RUNning the Admin listen loop
    System.out.println("In the admin looper thread");
    
    int q_len = 6; /* Number of requests for OpSys to queue */
    int port = 5050;  // We are listening at a different port for Admin clients
    Socket sock;

    try{
      ServerSocket servsock = new ServerSocket(port, q_len);
      while (adminControlSwitch) {
	// wait for the next ADMIN client connection:
	sock = servsock.accept();
	new AdminWorker (sock).start(); 
      }
    }catch (IOException ioe) {System.out.println(ioe);}
  }