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<html><head><title>VM Spec </title></head><body BGCOLOR=#eeeeff text=#000000 LINK=#0000ff VLINK=#000077 ALINK=#ff0000> <a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc157.html">Prev</a> | <a href="Instructions2.doc159.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><hr><br> <a name="monitorexit"></a><h2>monitorexit</h2><a name="monitorexit.Operation"></a><b>Operation</b><br><a name="69724"></a><p><Table Border="3"><tr><td><a name="69723"></a> <i>monitorexit</i><td><a name="87568"></a> </Table><Table><tr><td></Table>Exit monitor for object<p><a name="monitorexit.Forms"></a><b>Forms</b><br><a name="69725"></a><i>monitorexit</i> = 195 (0xc3)<p><a name="monitorexit.Stack"></a><b>Stack</b><br><a name="69726"></a>..., <i>objectref</i><em> </em><img src="chars/arrwdbrt.gif"> ... <p><a name="monitorexit.Description"></a><b>Description</b><br><a name="69727"></a>The <i>objectref</i> must be of type <code>reference</code>.<p><a name="69728"></a>The current thread must be the owner of the monitor associated with the instance referenced by <i>objectref</i>. The thread decrements the counter indicating the number of times it has entered this monitor. If as a result the value of the counter becomes zero, the current thread releases the monitor. If the monitor associated with <i>objectref</i> becomes free, other threads that are waiting to acquire that monitor are allowed to attempt to do so.<p><a name="monitorexit.Runtime"></a><b>Runtime Exceptions</b><br><a name="69730"></a>If <i>objectref</i><em> </em>is <code>null</code>, <i>monitorexit</i> throws a <code>NullPointerException</code>. <p><a name="69731"></a>Otherwise, if the current thread is not the owner of the monitor, <i>monitorexit</i> throws an <code>IllegalMonitorStateException</code>.<p><a name="monitorexit.Notes"></a><b>Notes</b><br><a name="131165"></a>For detailed information about threads and monitors in the Java Virtual Machine, see Chapter <a href="Threads.doc.html#21293">8</a>, <a href="Threads.doc.html#21294">"Threads and Locks."</a><p><hr><!-- This inserts footnotes--><p><a href="VMSpecTOC.doc.html">Contents</a> | <a href="Instructions2.doc157.html">Prev</a> | <a href="Instructions2.doc159.html">Next</a> | <a href="Mnemonics.doc.html">Index</a><p><font size=-1>Java Virtual Machine Specification (HTML generated by dkramer on February 25, 1997)<br><i><a href="Copyright.doc.html">Copyright © 1996 Sun Microsystems, Inc.</a>All rights reserved</i><br>Please send any comments or corrections to <a href="mailto:doug.kramer@sun.com">doug.kramer@sun.com</a></font></body></html>⌨️ 快捷键说明
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