From 0f9defa6d1b564478e6ed1939a996065c61dd21a Mon Sep 17 00:00:00 2001
From: Sayyed Ali Kiaian Mousavy <lkn2993@gmail.com>
Date: Thu, 21 Feb 2019 18:08:09 +0100
Subject: [PATCH] Changed 2 functions in binaryheap.java

Edited functions getHeadValue and toString in binaryHeapArray in file binaryheap.java to return null when size is 0
---
 src/com/jwetherell/algorithms/data_structures/BinaryHeap.java | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/com/jwetherell/algorithms/data_structures/BinaryHeap.java b/src/com/jwetherell/algorithms/data_structures/BinaryHeap.java
index 81932349..9e1f25f0 100644
--- a/src/com/jwetherell/algorithms/data_structures/BinaryHeap.java
+++ b/src/com/jwetherell/algorithms/data_structures/BinaryHeap.java
@@ -341,7 +341,7 @@ public T[] getHeap() {
          */
         @Override
         public T getHeadValue() {
-            if (array.length == 0) return null;
+            if (array.length == 0 || size == 0) return null;
             return array[0];
         }
 
@@ -372,7 +372,7 @@ public String toString() {
         protected static class HeapPrinter {
 
             public static <T extends Comparable<T>> String getString(BinaryHeapArray<T> tree) {
-                if (tree.array.length == 0)
+                if (tree.array.length == 0 || size == 0)
                     return "Tree has no nodes.";
 
                 T root = tree.array[0];