show localhost IP number to facilitate connections over local area network (LAN, WAN)

examples/src/TcpExamples/TcpExample2ConnectionCounting.java

@@ -33,7 +33,16 @@ public class TcpExample2ConnectionCounting
         {
             System.out.println("TcpExample2ConnectionCounting has started and is waiting for a connection.");
             System.out.println("  help: https://savage.nps.edu/Savage/developers.html#telnet");
-            System.out.println("  enter (nc localhost 2317) or (telnet localhost 2317)..." );
+            // Where are we?  In other words, what is our host number? Advertise it
+            // https://stackoverflow.com/questions/9481865/getting-the-ip-address-of-the-current-machine-using-java
+            String localHostAddress = Inet4Address.getLocalHost().toString();
+            System.out.println("Local host address is " + localHostAddress);
+            if (localHostAddress.contains("/"))
+                localHostAddress = localHostAddress.substring(localHostAddress.indexOf("/")+1);
+            // show localhost IP number to facilitate connections over local area network (LAN, WAN)
+            System.out.println("  enter (nc localhost   2317) or (telnet localhost   2317) for local operation" );
+            System.out.println("  enter (nc "     + localHostAddress + " 2317) or " +
+                                       "(telnet " + localHostAddress + " 2317)..." );
 			
             // ServerSocket waits for a connection from a client. 
             // Notice that it is outside the loop; ServerSocket needs to be made only once.
@@ -42,7 +51,7 @@ public class TcpExample2ConnectionCounting
             
             ServerSocket serverSocket = new ServerSocket(2317); // server decides here what port to listen on.
 			// of interest: often client doesn't care what port it uses locally when connecting to that server port.
-
+                
             // Loop, infinitely, waiting for client connections.
             // Stop the program somewhere else.
             while(true)