#502 Replaced usages of System.out with logger.

event-aggregator/src/main/java/com/iluwatar/event/aggregator/KingJoffrey.java

@@ -22,6 +22,9 @@
  */
 package com.iluwatar.event.aggregator;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * 
  * KingJoffrey observes events from {@link KingsHand}.
@@ -29,8 +32,10 @@ package com.iluwatar.event.aggregator;
  */
 public class KingJoffrey implements EventObserver {
 
+  private static final Logger LOGGER = LoggerFactory.getLogger(KingJoffrey.class);
+
   @Override
   public void onEvent(Event e) {
-    System.out.println("Received event from the King's Hand: " + e.toString());
+    LOGGER.info("Received event from the King's Hand: {}", e.toString());
   }
 }