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

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@@ -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

@@ -49,10 +49,16 @@
  * @see <a href="https://docs.oracle.com/javase/tutorial/uiswing/events/keylistener.html">Tutorial: Writing a Key Listener</a>
  *
  * @since 1.1
  */
 public abstract class KeyAdapter implements KeyListener {
+
+    /**
+     * Constructs a {@code KeyAdapter}.
+     */
+    protected KeyAdapter() {}
+
     /**
      * Invoked when a key has been typed.
      * This event occurs when a key press is followed by a key release.
      */
     public void keyTyped(KeyEvent e) {}
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