diff --git a/.DS_Store b/.DS_Store
index 5008ddf..5c9fb53 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/arraylist/ArrayIndexList.java b/arraylist/ArrayIndexList.java
new file mode 100644
index 0000000..27e6400
--- /dev/null
+++ b/arraylist/ArrayIndexList.java
@@ -0,0 +1,64 @@
+package arraylist;
+
+/**
+ * Created with xgiovio.macbookair.
+ * User: xgiovio
+ * Date: 24/03/14
+ * Time: 14:31
+ */
+public class ArrayIndexList<E> implements IndexList<E> {
+
+
+    public ArrayIndexList(){
+        indexlist = (E[])new Object [def_capacity];
+    }
+
+    public ArrayIndexList( int  in_n){
+        indexlist = (E[])new Object [in_n];
+    }
+
+
+    @Override
+    public E remove(int i) throws IndexOutOfBoundsException {
+        return null;
+    }
+
+    @Override
+    public void add(int i, E e) throws IndexOutOfBoundsException {
+
+    }
+
+    @Override
+    public E set(int i, E e) throws IndexOutOfBoundsException {
+        return null;
+    }
+
+    @Override
+    public E get(int i) throws IndexOutOfBoundsException {
+        return null;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        if (size() == 0){
+            return true;
+        }else{
+            return false;
+        }
+    }
+
+    @Override
+    public int size() {
+        return nelements;
+    }
+
+    @Override
+    public String toString() {
+        return super.toString();
+    }
+
+    private E[] indexlist;
+    private int def_capacity = 100;
+    private int nelements = 0;
+
+}
diff --git a/arraylist/IndexList.java b/arraylist/IndexList.java
new file mode 100644
index 0000000..247c9ec
--- /dev/null
+++ b/arraylist/IndexList.java
@@ -0,0 +1,20 @@
+package arraylist;
+
+/**
+ * Created with xgiovio.macbookair.
+ * User: xgiovio
+ * Date: 24/03/14
+ * Time: 14:29
+ */
+public interface IndexList<E> {
+
+
+    public E remove(int i) throws IndexOutOfBoundsException;
+    public void add(int i, E e) throws IndexOutOfBoundsException;
+    public E set(int i, E e) throws IndexOutOfBoundsException;
+    public E get(int i) throws IndexOutOfBoundsException;
+    public boolean isEmpty();
+    public int size();
+
+
+}