#113 Event Driven Architecture

Adds more Javadoc and fixes checkstyle issues.

event-driven-architecture/src/main/java/com/iluwatar/eda/event/UserUpdatedEvent.java

@@ -1,8 +1,21 @@
 package com.iluwatar.eda.event;
 
+import com.iluwatar.eda.model.User;
+
 /**
  * The {@link UserUpdatedEvent} class should should be dispatched whenever a user has been updated.
- * This class can be extended to contain details about the user has been updated.
+ * This class can be extended to contain details about the user has been updated. In this example,
+ * the entire {@link User} object is passed on as data with the event.
  */
 public class UserUpdatedEvent extends Event {
+
+  private User user;
+
+  public UserUpdatedEvent(User user) {
+    this.user = user;
+  }
+
+  public User getUser() {
+    return user;
+  }
 }