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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 23:33:05 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class TextField</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/TextField.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/TextComponent.AccessibleAWTTextComponent.html"><B>PREV CLASS</B></A> <A HREF="../../java/awt/TextField.AccessibleAWTTextField.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="TextField.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.TextComponent">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 TextField</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/TextComponent.html">java.awt.TextComponent</A> | +--<B>java.awt.TextField</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/MenuContainer.html">MenuContainer</A>, <A HREF="../../java/io/Serializable.html">Serializable</A></DD></DL><HR><DL><DT>public class <B>TextField</B><DT>extends <A HREF="../../java/awt/TextComponent.html">TextComponent</A></DL><P>A <code>TextField</code> object is a text component that allows for the editing of a single line of text. <p> For example, the following image depicts a frame with four text fields of varying widths. Two of these text fields display the predefined text <code>"Hello"</code>. <p> <img src="doc-files/TextField-1.gif" ALIGN=center HSPACE=10 VSPACE=7> <p> Here is the code that produces these four text fields: <p> <hr><blockquote><pre> TextField tf1, tf2, tf3, tf4; // a blank text field tf1 = new TextField(); // blank field of 20 columns tf2 = new TextField("", 20); // predefined text displayed tf3 = new TextField("Hello!"); // predefined text in 30 columns tf4 = new TextField("Hello", 30); </pre></blockquote><hr> <p> Every time the user types a key in the text field, one or more key events are sent to the text field. A <code>KeyEvent</code> may be one of three types: keyPressed, keyReleased, or keyTyped. The properties of a key event indicate which of these types it is, as well as additional information about the event, such as what modifiers are applied to the key event and the time at which the event occurred. <p> The key event is passed to every <code>KeyListener</code> or <code>KeyAdapter</code> object which registered to receive such events using the component's <code>addKeyListener</code> method. (<code>KeyAdapter</code> objects implement the <code>KeyListener</code> interface.) <p> It is also possible to fire an <code>ActionEvent</code>. If action events are enabled for the text field, they may be fired by pressing the <code>Return</code> key. <p> The <code>TextField</code> class's <code>processEvent</code> method examines the action event and passes it along to <code>processActionEvent</code>. The latter method redirects the event to any <code>ActionListener</code> objects that have registered to receive action events generated by this text field.<P><DL><DT><B>Since: </B><DD>JDK1.0</DD><DT><B>See Also: </B><DD><A HREF="../../java/awt/event/KeyEvent.html"><CODE>KeyEvent</CODE></A>, <A HREF="../../java/awt/event/KeyAdapter.html"><CODE>KeyAdapter</CODE></A>, <A HREF="../../java/awt/event/KeyListener.html"><CODE>KeyListener</CODE></A>, <A HREF="../../java/awt/event/ActionEvent.html"><CODE>ActionEvent</CODE></A>, <A HREF="../../java/awt/Component.html#addKeyListener(java.awt.event.KeyListener)"><CODE>Component.addKeyListener(java.awt.event.KeyListener)</CODE></A>, <A HREF="../../java/awt/TextField.html#processEvent(java.awt.AWTEvent)"><CODE>processEvent(java.awt.AWTEvent)</CODE></A>, <A HREF="../../java/awt/TextField.html#processActionEvent(java.awt.event.ActionEvent)"><CODE>processActionEvent(java.awt.event.ActionEvent)</CODE></A>, <A HREF="../../java/awt/TextField.html#addActionListener(java.awt.event.ActionListener)"><CODE>addActionListener(java.awt.event.ActionListener)</CODE></A>, <A HREF="../../serialized-form.html#java.awt.TextField">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/TextField.AccessibleAWTTextField.html">TextField.AccessibleAWTTextField</A></B></CODE><BR> This class implements accessibility support for the <code>TextField</code> class.</TD></TR></TABLE> <A NAME="inner_classes_inherited_from_class_java.awt.TextComponent"><!-- --></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/TextComponent.html">TextComponent</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/awt/TextComponent.AccessibleAWTTextComponent.html">TextComponent.AccessibleAWTTextComponent</A></CODE></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.TextComponent"><!-- --></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/TextComponent.html">TextComponent</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../java/awt/TextComponent.html#textListener">textListener</A></CODE></TD></TR></TABLE> <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/TextField.html#TextField()">TextField</A></B>()</CODE><BR> Constructs a new text field.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/awt/TextField.html#TextField(int)">TextField</A></B>(int columns)</CODE><BR> Constructs a new empty text field with the specified number of columns.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/awt/TextField.html#TextField(java.lang.String)">TextField</A></B>(<A HREF="../../java/lang/String.html">String</A> text)</CODE><BR> Constructs a new text field initialized with the specified text.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../java/awt/TextField.html#TextField(java.lang.String, int)">TextField</A></B>(<A HREF="../../java/lang/String.html">String</A> text, int columns)</CODE><BR> Constructs a new text field initialized with the specified text to be displayed, and wide enough to hold the specified number of columns.</TD></TR></TABLE> ⌨️ 快捷键说明
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