show both HostName and HostAddress

examples/src/TcpExamples/TcpExample3Server.java

@@ -20,6 +20,7 @@ import java.net.*;
  * and have the instructor display the socket pairs received.
  *
  * @author mcgredo
+ * @author brutzman
  */
 public class TcpExample3Server {
 
@@ -52,18 +53,24 @@ public class TcpExample3Server {
                     
                     // Print some information locally about the Socket connection.
                     // This includes the port and IP numbers on both sides (the socket pair).
-                    localAddress = clientConnection.getLocalAddress();
+                     localAddress = clientConnection.getLocalAddress();
                     remoteAddress = clientConnection.getInetAddress();
-                    localPort = clientConnection.getLocalPort();
-                    remotePort = clientConnection.getPort();
+                        localPort = clientConnection.getLocalPort();
+                       remotePort = clientConnection.getPort();
                     
                     // My socket pair connection looks like this, to localhost:
                     // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54876 ))
                     // Socket pair: (( /0:0:0:0:0:0:0:1, 2317 ), ( /0:0:0:0:0:0:0:1, 54881 ))
                     
                     // Why is the first IP/port the same, while the second set has different ports?
-                    System.out.println("TcpExample3Server socket pair: (( " + localAddress.toString() + ", " + localPort + " ), ( "
-                            + remoteAddress.toString() + ", " + remotePort + " ))");
+                    System.out.println("TcpExample3Server socket pair showing host name, address, port:");
+                    System.out.println("  (( " + 
+                         localAddress.getHostName() + "=" +  localAddress.getHostAddress() + ", " + localPort + " ), ( " + 
+                        remoteAddress.getHostName() + "=" + remoteAddress.getHostAddress() + ", " + remotePort + " ))");
+                    
+                    if ( localAddress.getHostName().equals( localAddress.getHostAddress()) ||
+                        remoteAddress.getHostName().equals(remoteAddress.getHostAddress()))
+                        System.out.println("  note HostName matches address if host has no DNS name");
                     
                     // Notice the use of flush() and try w/ resources. Without
                     // the try w/ resources the Socket object may stay open for