Implementato Iterator in NodePositionList e aggiunto solo i prototipi nelle altre classe che implementano Sequence

sequence/ArraySequence.java

@@ -7,6 +7,8 @@ import exceptions.InvalidPositionException;
 import position.Position;
 import sequence.utility.ArrayPosition;
 
+import java.util.Iterator;
+
 /**
  * Created with xgiovio.macbookair.
  * User: xgiovio
@@ -283,4 +285,9 @@ public class ArraySequence<E> implements Sequence<E> {
         }
     }
 
+
+    @Override
+    public Iterator<E> iterator() {
+        return null;
+    }
 }

sequence/ArraySequenceFake.java

@@ -8,6 +8,8 @@ import exceptions.InvalidPositionException;
 import position.Position;
 import sequence.utility.DNodeFake;
 
+import java.util.Iterator;
+
 /**
  * Created with MONSTER.
  * User: xgiovio
@@ -219,6 +221,8 @@ public class ArraySequenceFake<E> extends ArrayIndexList<E> implements Sequence<
         }
     }
 
-
-
+    @Override
+    public Iterator<E> iterator() {
+        return null;
+    }
 }