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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 23:38:56 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class JMenu</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/JMenu.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="../../javax/swing/JList.AccessibleJList.AccessibleJListChild.html"><B>PREV CLASS</B></A> <A HREF="../../javax/swing/JMenu.AccessibleJMenu.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="JMenu.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: <A HREF="#inner_class_summary">INNER</A> | <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><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.swing</FONT><BR>Class JMenu</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<A HREF="../../java/awt/Component.html">java.awt.Component</A> | +--<A HREF="../../java/awt/Container.html">java.awt.Container</A> | +--<A HREF="../../javax/swing/JComponent.html">javax.swing.JComponent</A> | +--<A HREF="../../javax/swing/AbstractButton.html">javax.swing.AbstractButton</A> | +--<A HREF="../../javax/swing/JMenuItem.html">javax.swing.JMenuItem</A> | +--<B>javax.swing.JMenu</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../javax/accessibility/Accessible.html">Accessible</A>, <A HREF="../../java/awt/image/ImageObserver.html">ImageObserver</A>, <A HREF="../../java/awt/ItemSelectable.html">ItemSelectable</A>, <A HREF="../../java/awt/MenuContainer.html">MenuContainer</A>, <A HREF="../../javax/swing/MenuElement.html">MenuElement</A>, <A HREF="../../java/io/Serializable.html">Serializable</A>, <A HREF="../../javax/swing/SwingConstants.html">SwingConstants</A></DD></DL><HR><DL><DT>public class <B>JMenu</B><DT>extends <A HREF="../../javax/swing/JMenuItem.html">JMenuItem</A><DT>implements <A HREF="../../javax/accessibility/Accessible.html">Accessible</A>, <A HREF="../../javax/swing/MenuElement.html">MenuElement</A></DL><P>An implementation of a menu -- a popup window containing <code>JMenuItem</code>s that is displayed when the user selects an item on the <code>JMenuBar</code>. In addition to <code>JMenuItem</code>s, a <code>JMenu</code> can also contain <code>JSeparator</code>s. <p> In essence, a menu is a button with an associated <code>JPopupMenu</code>. When the "button" is pressed, the <code>JPopupMenu</code> appears. If the "button" is on the <code>JMenuBar</code>, the menu is a top-level window. If the "button" is another menu item, then the <code>JPopupMenu</code> is "pull-right" menu. <p> For information and examples of using menus see <a href="http://java.sun.com/doc/books/tutorial/uiswing/components/menu.html">How to Use Menus</a>, a section in <em>The Java Tutorial.</em> For the keyboard keys used by this component in the standard Look and Feel (L&F) renditions, see the <a href="doc-files/Key-Index.html#JMenu">JMenu</a> key assignments. <p> <strong>Warning:</strong> Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. A future release of Swing will provide support for long term persistence.<P><DL><DT><B>See Also: </B><DD><A HREF="../../javax/swing/JMenuItem.html"><CODE>JMenuItem</CODE></A>, <A HREF="../../javax/swing/JSeparator.html"><CODE>JSeparator</CODE></A>, <A HREF="../../javax/swing/JMenuBar.html"><CODE>JMenuBar</CODE></A>, <A HREF="../../javax/swing/JPopupMenu.html"><CODE>JPopupMenu</CODE></A>, <A HREF="../../serialized-form.html#javax.swing.JMenu">Serialized Form</A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><A NAME="inner_class_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Inner Class Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected class</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JMenu.AccessibleJMenu.html">JMenu.AccessibleJMenu</A></B></CODE><BR> This class implements accessibility support for the <code>JMenu</code> class.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected class</CODE></FONT></TD><TD><CODE><B><A HREF="../../javax/swing/JMenu.WinListener.html">JMenu.WinListener</A></B></CODE><BR> A listener class that watches for a popup window closing.</TD></TR></TABLE> <A NAME="inner_classes_inherited_from_class_javax.swing.JMenuItem"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Inner classes inherited from class javax.swing.<A HREF="../../javax/swing/JMenuItem.html">JMenuItem</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../javax/swing/JMenuItem.AccessibleJMenuItem.html">JMenuItem.AccessibleJMenuItem</A></CODE></TD></TR></TABLE>⌨️ 快捷键说明
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