src/java.desktop/share/classes/java/awt/event/MouseMotionAdapter.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 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

@@ -52,10 +52,16 @@
  * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html">Tutorial: Writing a Mouse Motion Listener</a>
  *
  * @since 1.1
  */
 public abstract class MouseMotionAdapter implements MouseMotionListener {
+
+    /**
+     * Constructs a {@code MouseMotionAdapter}.
+     */
+    protected MouseMotionAdapter() {}
+
     /**
      * Invoked when a mouse button is pressed on a component and then
      * dragged.  Mouse drag events will continue to be delivered to
      * the component where the first originated until the mouse button is
      * released (regardless of whether the mouse position is within the