# HG changeset patch
# User igerasim
# Date 1530324928 25200
#      Fri Jun 29 19:15:28 2018 -0700
# Node ID 3897f7d73a340a94e1837631e540586612f6d593
# Parent  9f62267e79df8fd87172aa08971ba66701286f90
[mq]: 8206123-ArrayDeque-created-with-default-constructor-can-only-hold-15-elements

diff --git a/src/java.base/share/classes/java/util/ArrayDeque.java b/src/java.base/share/classes/java/util/ArrayDeque.java
--- a/src/java.base/share/classes/java/util/ArrayDeque.java
+++ b/src/java.base/share/classes/java/util/ArrayDeque.java
@@ -180,7 +180,8 @@
      * sufficient to hold 16 elements.
      */
     public ArrayDeque() {
-        elements = new Object[16];
+        // One extra slot for a null element at the tail
+        elements = new Object[16 + 1];
     }
 
     /**