inital commit

Lab107-VenbergGE/src/Queue.java

@@ -0,0 +1,28 @@
+/**
+ * Data Structures & Algorithms 6th Edition 
+ * Goodrich, Tamassia, Goldwasser
+ * Code Fragment 6.9
+ * 
+ * An implementation of the Queue interface
+ * */
+
+/**
+ *
+ * @author Gabriel Venberg
+ */
+public interface Queue<E> {
+    /** returns the number of elements in the queue*/
+    int size();
+    
+    /** tests whether the queue is empty*/
+    boolean isEmpty();
+    
+    /**inserts an element at the rear of the queue*/
+    void enqueue(E e);
+    
+    /**returns, but does not remove, the first element of the queue (null if empty). */
+    E first();
+    
+    /** removes and returns the first element of the queue (null if empty)*/
+    E dequeue();
+}