Java 11 migrate c-d (remaining) (#1111)

* Moves converter pattern to Java 11

* Moves cqrs pattern to Java 11

* Moves dao pattern to Java 11

* Moves data-bus pattern to Java 11

* Moves data-locality pattern to Java 11

* Moves data-mapper pattern to Java 11

* Moves data-transfer-object pattern to Java 11

* Moves decorator pattern to Java 11

* Moves delegation pattern to Java 11

* Moves dependency-injection to Java 11

* Moves dirty-flag to Java 11

* Moves double-buffer to Java 11

* Moves double-checked-locking to Java 11

* Moves double-dispatch to Java 11

* Corrects with changes thats breaking test cases

dirty-flag/src/main/java/com/iluwatar/dirtyflag/World.java

@@ -47,10 +47,8 @@ public class World {
    * @return List of strings
    */
   public List<String> fetch() {
-    List<String> data = df.fetch();
-
+    var data = df.fetch();
     countries = data.isEmpty() ? countries : data;
-
     return countries;
   }
 }