fix: remove unnecesary throw to fix #704

- Fix #704
- Thanks @lprone

DataStructures/Heaps/Heap.java

@@ -1,4 +1,4 @@
-package heaps;
+package Heaps;
 
 /**
  * Interface common to heap data structures.<br>
@@ -10,32 +10,31 @@ package heaps;
  * max-heap).</p>
  * <p>All heap-related operations (inserting or deleting an element, extracting the min or max) are performed in
  * O(log n) time.</p>
+ *
  * @author Nicolas Renard
- * 
- * 
  */
 public interface Heap {
-    
+
     /**
-     * 
      * @return the top element in the heap, the one with lowest key for min-heap or with
      * the highest key for max-heap
-     * @throws Exception if heap is empty
+     * @throws EmptyHeapException if heap is empty
      */
-    public abstract HeapElement getElement() throws EmptyHeapException;
+    HeapElement getElement() throws EmptyHeapException;
+
     /**
      * Inserts an element in the heap. Adds it to then end and toggle it until it finds its
      * right position.
-     * 
+     *
      * @param element an instance of the HeapElement class.
      */
-    public abstract void insertElement(HeapElement element);
-    
+    void insertElement(HeapElement element);
+
     /**
      * Delete an element in the heap.
-     * 
+     *
      * @param elementIndex int containing the position in the heap of the element to be deleted.
      */
-    public abstract void deleteElement(int elementIndex);
+    void deleteElement(int elementIndex);
 
-}
+}