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src/java.desktop/share/classes/java/awt/ContainerOrderFocusTraversalPolicy.java

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -85,10 +85,15 @@
      * list should be reused if possible.
      */
     private transient Container cachedRoot;
     private transient List<Component> cachedCycle;
 
+    /**
+     * Constructs a {@code ContainerOrderFocusTraversalPolicy}.
+     */
+    public ContainerOrderFocusTraversalPolicy() {}
+
     /*
      * We suppose to use getFocusTraversalCycle & getComponentIndex methods in order
      * to divide the policy into two parts:
      * 1) Making the focus traversal cycle.
      * 2) Traversing the cycle.
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