src/java.desktop/share/classes/java/awt/event/FocusAdapter.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
*** 48,57 ****
--- 48,63 ----
   *
   * @author Carl Quinn
   * @since 1.1
   */
  public abstract class FocusAdapter implements FocusListener {
+ 
+     /**
+      * Constructs a {@code FocusAdapter}.
+      */
+     protected FocusAdapter() {}
+ 
      /**
       * Invoked when a component gains the keyboard focus.
       */
      public void focusGained(FocusEvent e) {}