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src/java.desktop/share/classes/java/awt/dnd/DropTargetAdapter.java

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@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 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

@@ -71,10 +71,15 @@
  * @since 1.4
  */
 public abstract class DropTargetAdapter implements DropTargetListener {
 
     /**
+     * Constructs a {@code DropTargetAdapter}.
+     */
+    protected DropTargetAdapter() {}
+
+    /**
      * Called while a drag operation is ongoing, when the mouse pointer enters
      * the operable part of the drop site for the {@code DropTarget}
      * registered with this listener.
      *
      * @param dtde the {@code DropTargetDragEvent}
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