implementato parzialmente la deque

deque/Deque.java

@@ -0,0 +1,22 @@
+package deque;
+
+import exceptions.EmptyDequeException;
+
+/**
+ * Created with xgiovio.macbookair.
+ * User: xgiovio
+ * Date: 17/03/14
+ * Time: 16:21
+ */
+public interface Deque<E> {
+
+    int size();
+    boolean isEmpty();
+    E getFirst() throws EmptyDequeException;
+    E getLast() throws EmptyDequeException;
+    void addFirst (E element );
+    void addLast (E element);
+    E removeFirst() throws EmptyDequeException;
+    E removeLast() throws EmptyDequeException;
+
+}