list.html
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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 23:32:46 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class List</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/List.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/awt/Label.AccessibleAWTLabel.html"><B>PREV CLASS</B></A> <A HREF="../../java/awt/List.AccessibleAWTList.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="List.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="#fields_inherited_from_class_java.awt.Component">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: 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.awt</FONT><BR>Class List</H2><PRE><A HREF="../../java/lang/Object.html">java.lang.Object</A> | +--<A HREF="../../java/awt/Component.html">java.awt.Component</A> | +--<B>java.awt.List</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="../../java/io/Serializable.html">Serializable</A></DD></DL><HR><DL><DT>public class <B>List</B><DT>extends <A HREF="../../java/awt/Component.html">Component</A><DT>implements <A HREF="../../java/awt/ItemSelectable.html">ItemSelectable</A>, <A HREF="../../javax/accessibility/Accessible.html">Accessible</A></DL><P>The <code>List</code> component presents the user with a scrolling list of text items. The list can be set up so that the user can choose either one item or multiple items. <p> For example, the code . . . <p> <hr><blockquote><pre> List lst = new List(4, false); lst.add("Mercury"); lst.add("Venus"); lst.add("Earth"); lst.add("JavaSoft"); lst.add("Mars"); lst.add("Jupiter"); lst.add("Saturn"); lst.add("Uranus"); lst.add("Neptune"); lst.add("Pluto"); cnt.add(lst); </pre></blockquote><hr> <p> where <code>cnt</code> is a container, produces the following scrolling list: <p> <img src="doc-files/List-1.gif" ALIGN=center HSPACE=10 VSPACE=7> <p> Clicking on an item that isn't selected selects it. Clicking on an item that is already selected deselects it. In the preceding example, only one item from the scrolling list can be selected at a time, since the second argument when creating the new scrolling list is <code>false</code>. Selecting an item causes any other selected item to be automatically deselected. <p> Beginning with Java 1.1, the Abstract Window Toolkit sends the <code>List</code> object all mouse, keyboard, and focus events that occur over it. (The old AWT event model is being maintained only for backwards compatibility, and its use is discouraged.) <p> When an item is selected or deselected, AWT sends an instance of <code>ItemEvent</code> to the list. When the user double-clicks on an item in a scrolling list, AWT sends an instance of <code>ActionEvent</code> to the list following the item event. AWT also generates an action event when the user presses the return key while an item in the list is selected. <p> If an application wants to perform some action based on an item in this list being selected or activated, it should implement <code>ItemListener</code> or <code>ActionListener</code> as appropriate and register the new listener to receive events from this list. <p> For multiple-selection scrolling lists, it is considered a better user interface to use an external gesture (such as clicking on a button) to trigger the action.<P><DL><DT><B>Since: </B><DD>JDK1.0</DD><DT><B>See Also: </B><DD><A HREF="../../java/awt/event/ItemEvent.html"><CODE>ItemEvent</CODE></A>, <A HREF="../../java/awt/event/ItemListener.html"><CODE>ItemListener</CODE></A>, <A HREF="../../java/awt/event/ActionEvent.html"><CODE>ActionEvent</CODE></A>, <A HREF="../../java/awt/event/ActionListener.html"><CODE>ActionListener</CODE></A>, <A HREF="../../serialized-form.html#java.awt.List">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="../../java/awt/List.AccessibleAWTList.html">List.AccessibleAWTList</A></B></CODE><BR> This class implements accessibility support for the <code>List</code> class.</TD></TR></TABLE> <A NAME="inner_classes_inherited_from_class_java.awt.Component"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Inner classes inherited from class java.awt.<A HREF="../../java/awt/Component.html">Component</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/awt/Component.AccessibleAWTComponent.html">Component.AccessibleAWTComponent</A></CODE></TD></TR></TABLE> <!-- =========== FIELD SUMMARY =========== --><A NAME="fields_inherited_from_class_java.awt.Component"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class java.awt.<A HREF="../../java/awt/Component.html">Component</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/awt/Component.html#BOTTOM_ALIGNMENT">BOTTOM_ALIGNMENT</A>, <A HREF="../../java/awt/Component.html#CENTER_ALIGNMENT">CENTER_ALIGNMENT</A>, <A HREF="../../java/awt/Component.html#LEFT_ALIGNMENT">LEFT_ALIGNMENT</A>, <A HREF="../../java/awt/Component.html#RIGHT_ALIGNMENT">RIGHT_ALIGNMENT</A>, <A HREF="../../java/awt/Component.html#TOP_ALIGNMENT">TOP_ALIGNMENT</A></CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_java.awt.image.ImageObserver"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from interface java.awt.image.<A HREF="../../java/awt/image/ImageObserver.html">ImageObserver</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/awt/image/ImageObserver.html#ABORT">ABORT</A>, <A HREF="../../java/awt/image/ImageObserver.html#ALLBITS">ALLBITS</A>, <A HREF="../../java/awt/image/ImageObserver.html#ERROR">ERROR</A>, <A HREF="../../java/awt/image/ImageObserver.html#FRAMEBITS">FRAMEBITS</A>, <A HREF="../../java/awt/image/ImageObserver.html#HEIGHT">HEIGHT</A>, <A HREF="../../java/awt/image/ImageObserver.html#PROPERTIES">PROPERTIES</A>, <A HREF="../../java/awt/image/ImageObserver.html#SOMEBITS">SOMEBITS</A>, <A HREF="../../java/awt/image/ImageObserver.html#WIDTH">WIDTH</A></CODE></TD></TR></TABLE> <!-- ======== 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/awt/List.html#List()">List</A></B>()</CODE><BR> Creates a new scrolling list.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/awt/List.html#List(int)">List</A></B>(int rows)</CODE><BR> Creates a new scrolling list initialized with the specified number of visible lines.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/awt/List.html#List(int, boolean)">List</A></B>(int rows, boolean multipleMode)</CODE><BR> Creates a new scrolling list initialized to display the specified number of rows.</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> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../java/awt/List.html#add(java.lang.String)">add</A></B>(<A HREF="../../java/lang/String.html">String</A> item)</CODE><BR> Adds the specified item to the end of scrolling list.</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/awt/List.html#add(java.lang.String, int)">add</A></B>(<A HREF="../../java/lang/String.html">String</A> item, int index)</CODE><BR> Adds the specified item to the the scrolling list at the position indicated by the index.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD>⌨️ 快捷键说明
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