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

@@ -23,10 +23,13 @@
  * questions.
  */
 
 package java.awt.desktop;
 
+import java.awt.Desktop;
+import java.awt.GraphicsEnvironment;
+import java.awt.HeadlessException;
 
 /**
  * Event sent when the application has become the foreground app, and when it is
  * no longer the foreground app.
  *

@@ -34,14 +37,21 @@
  * @see AppForegroundListener#appMovedToBackground(AppForegroundEvent)
  *
  * @since 9
  */
 public final class AppForegroundEvent extends AppEvent {
+
     private static final long serialVersionUID = -5513582555740533911L;
 
     /**
-     * Constructs an {@code AppForegroundEvent}
+     * Constructs an {@code AppForegroundEvent}.
+     *
+     * @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 AppForegroundEvent() {
     }
-
 }