src/java.desktop/share/classes/java/awt/desktop/PreferencesEvent.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2016, 2018, 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

@@ -23,23 +23,33 @@
  * questions.
  */
 
 package java.awt.desktop;
 
+import java.awt.Desktop;
+import java.awt.GraphicsEnvironment;
+import java.awt.HeadlessException;
 
 /**
  * Event sent when the application is asked to open its preferences window.
  *
  * @see PreferencesHandler#handlePreferences
  *
  * @since 9
  */
 public final class PreferencesEvent extends AppEvent {
+
     private static final long serialVersionUID = -6398607097086476160L;
 
     /**
-     * Constructs a {@code PreferencesEvent}
+     * Constructs a {@code PreferencesEvent}.
+     *
+     * @throws HeadlessException if {@link GraphicsEnvironment#isHeadless()}
+     *         returns {@code true}
+     * @throws UnsupportedOperationException if Desktop API is not supported on
+     *         the current platform
+     * @see Desktop#isDesktopSupported()
+     * @see java.awt.GraphicsEnvironment#isHeadless
      */
     public PreferencesEvent() {
     }
-
 }