fix imports, proper declaration of Enumeration<NetworkInterface>

examples/src/OpenDis7Examples/EspduSender.java

 package OpenDis7Examples;
 
-import java.io.*;
-import java.net.*;
-import java.util.*;
-
-import edu.nps.moves.dis7.pdus.*;
+import edu.nps.moves.dis7.entities.usa.platform.land.M1A2;
 import edu.nps.moves.dis7.enumerations.Country;
 import edu.nps.moves.dis7.enumerations.EntityKind;
 import edu.nps.moves.dis7.enumerations.PlatformDomain;
+import edu.nps.moves.dis7.pdus.*;
 import edu.nps.moves.dis7.utilities.*;
-import edu.nps.moves.dis7.entities.usa.platform.land.M1A2;
+import java.io.*;
+import java.net.*;
+import java.util.*;
 
 /**
  * Creates and sends ESPDUs in IEEE binary format. Adapted from OpenDIS library
@@ -394,14 +393,14 @@ public class EspduSender
 	public static Set<InetAddress> getBroadcastAddresses()
 	{
 		Set<InetAddress> broadcastAddresses = new HashSet<>();
-		Enumeration interfaces;
+		Enumeration<NetworkInterface> interfaces;
 
 		try {
 			interfaces = NetworkInterface.getNetworkInterfaces();
 
 			while (interfaces.hasMoreElements())
 			{
-				NetworkInterface anInterface = (NetworkInterface) interfaces.nextElement();
+				NetworkInterface anInterface = interfaces.nextElement();
 
 				if (anInterface.isUp())
 				{