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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.4.2_02) on Thu Nov 13 17:20:58 PST 2003 --><TITLE>Timer (Java 2 Platform Ent. Ed. v1.4)</TITLE><META NAME="keywords" CONTENT="javax.management.timer.Timer class"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Timer (Java 2 Platform Ent. 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Ed. v1.4</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> PREV CLASS <A HREF="../../../javax/management/timer/TimerAlarmClockNotification.html" title="class in javax.management.timer"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" target="_top"><B>FRAMES</B></A> <A HREF="Timer.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.management.timer</FONT><BR>Class Timer</H2><PRE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><A HREF="../../../javax/management/NotificationBroadcasterSupport.html" title="class in javax.management">javax.management.NotificationBroadcasterSupport</A> <IMG SRC="../../../resources/inherit.gif" ALT="extended by"><B>javax.management.timer.Timer</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../javax/management/MBeanRegistration.html" title="interface in javax.management">MBeanRegistration</A>, <A HREF="../../../javax/management/NotificationBroadcaster.html" title="interface in javax.management">NotificationBroadcaster</A>, <A HREF="../../../javax/management/NotificationEmitter.html" title="interface in javax.management">NotificationEmitter</A>, <A HREF="../../../javax/management/timer/TimerMBean.html" title="interface in javax.management.timer">TimerMBean</A></DD></DL><HR><DL><DT>public class <B>Timer</B><DT>extends <A HREF="../../../javax/management/NotificationBroadcasterSupport.html" title="class in javax.management">NotificationBroadcasterSupport</A><DT>implements <A HREF="../../../javax/management/timer/TimerMBean.html" title="interface in javax.management.timer">TimerMBean</A>, <A HREF="../../../javax/management/MBeanRegistration.html" title="interface in javax.management">MBeanRegistration</A></DL><P>Provides the implementation of the timer MBean. The timer MBean sends out an alarm at a specified time that wakes up all the listeners registered to receive timer notifications. <P> This class manages a list of dated timer notifications. A method allows users to add/remove as many notifications as required. When a timer notification is emitted by the timer and becomes obsolete, it is automatically removed from the list of timer notifications. <BR>Additional timer notifications can be added into regularly repeating notifications. <P> Note: <OL> <LI>All notifications before the time when the <CODE>addNotification</CODE> method is called are ignored, irrespective of the <CODE>sendPastNotifications</CODE> flag. <LI>When sending timer notifications, the timer updates the notification sequence number irrespective of the notification type. <LI>The timer service relies on the system date of the host where the <CODE>Timer</CODE> class is loaded. Listeners may receive untimely notifications if their host has a different system date. To avoid such problems, synchronize the system date of all host machines where timing is needed. <LI>The default behaviour for periodic notifications is <i>fixed-delay execution</i>, as specified in <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Timer.html" title="class or interface in java.util"><CODE>Timer</CODE></A>. In order to use <i>fixed-rate execution</i>, use the overloaded <A HREF="../../../javax/management/timer/Timer.html#addNotification(java.lang.String, java.lang.String, java.lang.Object, java.util.Date, long, long, boolean)"><CODE>addNotification(String, String, Object, Date, long, long, boolean)</CODE></A> method. <LI>Notification listeners are potentially all executed in the same thread. Therefore, they should execute rapidly to avoid holding up other listeners or perturbing the regularity of fixed-delay executions. See <A HREF="../../../javax/management/NotificationBroadcasterSupport.html" title="class in javax.management"><CODE>NotificationBroadcasterSupport</CODE></A>. </OL><P><P><DL><DT><B>Version:</B></DT> <DD>4.47 10/03/02</DD><DT><B>Author:</B></DT> <DD>Sun Microsystems, Inc</DD></DL><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/timer/Timer.html#ONE_DAY">ONE_DAY</A></B></CODE><BR> Number of milliseconds in one day. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/timer/Timer.html#ONE_HOUR">ONE_HOUR</A></B></CODE><BR> Number of milliseconds in one hour. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/timer/Timer.html#ONE_MINUTE">ONE_MINUTE</A></B></CODE><BR> Number of milliseconds in one minute. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/timer/Timer.html#ONE_SECOND">ONE_SECOND</A></B></CODE><BR> Number of milliseconds in one second. </TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static long</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/management/timer/Timer.html#ONE_WEEK">ONE_WEEK</A></B></CODE><BR> Number of milliseconds in one week. </TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/management/timer/Timer.html#Timer()">Timer</A></B>()</CODE><BR> Default constructor.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== -->⌨️ 快捷键说明
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