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

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@@ -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 +23,14 @@
  * questions.
  */
 
 package java.awt.desktop;
 
+import java.awt.Desktop;
+import java.awt.GraphicsEnvironment;
+import java.awt.HeadlessException;
+
 /**
  * Event sent when the system enters and exits power save sleep.
  *
  * @see SystemSleepListener#systemAboutToSleep(SystemSleepEvent)
  * @see SystemSleepListener#systemAwoke(SystemSleepEvent)

@@ -36,10 +40,17 @@
 public final class SystemSleepEvent extends AppEvent {
 
     private static final long serialVersionUID = 11372269824930549L;
 
     /**
-     * Constructs a SystemSleepEvent
+     * Constructs a {@code SystemSleepEvent}.
+     *
+     * @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 SystemSleepEvent() {
     }
 }
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