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

*** 1,7 ****
  /*
!  * Copyright (c) 1996, 2013, 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
--- 1,7 ----
  /*
!  * 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
*** 49,58 ****
--- 49,64 ----
   * @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) {}