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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:35:14 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class ThreadGroup</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/ThreadGroup.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../java/lang/Thread.html"><B>PREV CLASS</B></A> <A HREF="../../java/lang/ThreadLocal.html"><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="ThreadGroup.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | FIELD | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">java.lang</FONT><BR>Class ThreadGroup</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<B>java.lang.ThreadGroup</B></PRE><HR><DL><DT>public class <B>ThreadGroup</B><DT>extends <A HREF="../../java/lang/Object.html">Object</A></DL><P>A thread group represents a set of threads. In addition, a thread group can also include other thread groups. The thread groups form a tree in which every thread group except the initial thread group has a parent. <p> A thread is allowed to access information about its own thread group, but not to access information about its thread group's parent thread group or any other thread groups.<P><DL><DT><B>Since: </B><DD>JDK1.0</DD></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><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="../../java/lang/ThreadGroup.html#ThreadGroup(java.lang.String)">ThreadGroup</A></B>(<A HREF="../../java/lang/String.html">String</A> name)</CODE><BR> Constructs a new thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#ThreadGroup(java.lang.ThreadGroup, java.lang.String)">ThreadGroup</A></B>(<A HREF="../../java/lang/ThreadGroup.html">ThreadGroup</A> parent, <A HREF="../../java/lang/String.html">String</A> name)</CODE><BR> Creates a new thread group.</TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#activeCount()">activeCount</A></B>()</CODE><BR> Returns an estimate of the number of active threads in this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#activeGroupCount()">activeGroupCount</A></B>()</CODE><BR> Returns an estimate of the number of active groups in this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#allowThreadSuspension(boolean)">allowThreadSuspension</A></B>(boolean b)</CODE><BR> <B>Deprecated.</B> <I>The definition of this call depends on <A HREF="../../java/lang/ThreadGroup.html#suspend()"><CODE>suspend()</CODE></A>, which is deprecated. Further, the behavior of this call was never specified.</I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#checkAccess()">checkAccess</A></B>()</CODE><BR> Determines if the currently running thread has permission to modify this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#destroy()">destroy</A></B>()</CODE><BR> Destroys this thread group and all of its subgroups.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#enumerate(java.lang.Thread[])">enumerate</A></B>(<A HREF="../../java/lang/Thread.html">Thread</A>[] list)</CODE><BR> Copies into the specified array every active thread in this thread group and its subgroups.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#enumerate(java.lang.Thread[], boolean)">enumerate</A></B>(<A HREF="../../java/lang/Thread.html">Thread</A>[] list, boolean recurse)</CODE><BR> Copies into the specified array every active thread in this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#enumerate(java.lang.ThreadGroup[])">enumerate</A></B>(<A HREF="../../java/lang/ThreadGroup.html">ThreadGroup</A>[] list)</CODE><BR> Copies into the specified array references to every active subgroup in this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#enumerate(java.lang.ThreadGroup[], boolean)">enumerate</A></B>(<A HREF="../../java/lang/ThreadGroup.html">ThreadGroup</A>[] list, boolean recurse)</CODE><BR> Copies into the specified array references to every active subgroup in this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#getMaxPriority()">getMaxPriority</A></B>()</CODE><BR> Returns the maximum priority of this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#getName()">getName</A></B>()</CODE><BR> Returns the name of this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../java/lang/ThreadGroup.html">ThreadGroup</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#getParent()">getParent</A></B>()</CODE><BR> Returns the parent of this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#interrupt()">interrupt</A></B>()</CODE><BR> Interrupts all threads in this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#isDaemon()">isDaemon</A></B>()</CODE><BR> Tests if this thread group is a daemon thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#isDestroyed()">isDestroyed</A></B>()</CODE><BR> Tests if this thread group has been destroyed.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#list()">list</A></B>()</CODE><BR> Prints information about this thread group to the standard output.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#parentOf(java.lang.ThreadGroup)">parentOf</A></B>(<A HREF="../../java/lang/ThreadGroup.html">ThreadGroup</A> g)</CODE><BR> Tests if this thread group is either the thread group argument or one of its ancestor thread groups.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#resume()">resume</A></B>()</CODE><BR> <B>Deprecated.</B> <I>This method is used solely in conjunction with <tt>Thread.suspend</tt> and <tt>ThreadGroup.suspend</tt>, both of which have been deprecated, as they are inherently deadlock-prone. See <A HREF="../../java/lang/Thread.html#suspend()"><CODE>Thread.suspend()</CODE></A> for details.</I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#setDaemon(boolean)">setDaemon</A></B>(boolean daemon)</CODE><BR> Changes the daemon status of this thread group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#setMaxPriority(int)">setMaxPriority</A></B>(int pri)</CODE><BR> Sets the maximum priority of the group.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/lang/ThreadGroup.html#stop()">stop</A></B>()</CODE><BR> <B>Deprecated.</B> <I>This method is inherently unsafe. See <A HREF="../../java/lang/Thread.html#stop()"><CODE>Thread.stop()</CODE></A> for details.</I></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor">⌨️ 快捷键说明
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