warn if user tries to start client before server

examples/src/TcpExamples/TcpExample3Client.java

@@ -97,6 +97,10 @@ public class TcpExample3Client
             if (e instanceof java.net.BindException) {
                 System.err.println("*** Be sure to stop any other running instances of programs using this port!");
             }
+            else if (e instanceof java.net.ConnectException) 
+            {
+                System.out.println("*** Be sure to start the server before starting the client!");
+            }
         }
         finally // occurs after any other activity when shutting down
         {

examples/src/TcpExamples/TcpExample4Client.java

@@ -79,6 +79,10 @@ public class TcpExample4Client
             if (e instanceof java.net.BindException) {
                 System.out.println("*** Be sure to stop any other running instances of programs using this port!");
             }
+            else if (e instanceof java.net.ConnectException) 
+            {
+                System.out.println("*** Be sure to start the server before starting the client!");
+            }
         }
     }
 }

examples/src/TcpExamples/TcpSentryScenarioClient.java

@@ -112,12 +112,17 @@ public class TcpSentryScenarioClient
             System.out.println(prefix + " complete");
             // main method now exits
         } catch (IOException e) {
-            System.out.println("Problem with " + prefix + " networking:networking:"); // describe what is happening
-            System.out.println("Error: " + e);
+            System.out.println("*** Problem with " + prefix + "networking:"); // describe what is happening
+            System.out.println("    " + e);
             // Provide more helpful information to user if exception occurs due to running twice at one time
-            if (e instanceof java.net.BindException) {
+            if (e instanceof java.net.BindException) 
+            {
                 System.out.println("*** Be sure to stop any other running instances of programs using this port!");
             }
+            else if (e instanceof java.net.ConnectException) 
+            {
+                System.out.println("*** Be sure to start the server before starting the client!");
+            }
         }
     }
 }