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

@@ -48,10 +48,16 @@
  *
  * @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) {}
 
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