Rimosso ArraySequenceFake. Implementato positions() in NodePositionList. Creato il DefaultComparator. Prima implementazione di SortedPriorityList

sequence/ArraySequence.java

@@ -290,4 +290,9 @@ public class ArraySequence<E> implements Sequence<E> {
     public Iterator<E> iterator() {
         return null;
     }
+
+    @Override
+    public Iterator<Position<E>> positions() {
+        return null;
+    }
 }