improved diagnostics, comments

projects/UdpExample1/UdpReceiver/src/udpreceiver/UdpReceiver.java

@@ -38,7 +38,7 @@ public class UdpReceiver
                 DataInputStream dis = new DataInputStream(bais);
                 
                 // What happens if you read an integer? Two double values?
-                float first = dis.readFloat();
+                float first  = dis.readFloat(); // alternatives: readFloat(); readInt();
                 float second = dis.readFloat();
                 System.out.println("first: " + first + " second: " + second);
             }

projects/UdpExample1/UdpSender/src/udpsender/UdpSender.java

@@ -32,7 +32,7 @@ public class UdpSender
             
             ByteArrayOutputStream baos = new ByteArrayOutputStream();
             DataOutputStream dos = new DataOutputStream(baos);
-            dos.writeFloat(17.0f);
+            dos.writeFloat(17.0f); // alternatives: writeFloat(17.0f); writeInt(17);
             dos.writeFloat(23.0f);
             byte[] buffer = baos.toByteArray();