1 /*
   2  * Copyright (c) 1995, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any

  24  */
  25 package java.awt;
  26 
  27 import java.awt.peer.TextFieldPeer;
  28 import java.awt.event.*;
  29 import java.util.EventListener;
  30 import java.io.ObjectOutputStream;
  31 import java.io.ObjectInputStream;
  32 import java.io.IOException;
  33 import javax.accessibility.*;
  34 
  35 
  36 /**
  37  * A {@code TextField} object is a text component
  38  * that allows for the editing of a single line of text.
  39  * <p>
  40  * For example, the following image depicts a frame with four
  41  * text fields of varying widths. Two of these text fields
  42  * display the predefined text {@code "Hello"}.
  43  * <p>
  44  * <img src="doc-files/TextField-1.gif" alt="The preceding text describes this image."
  45  * style="float:center; margin: 7px 10px;">
  46  * <p>
  47  * Here is the code that produces these four text fields:
  48  *
  49  * <hr><blockquote><pre>
  50  * TextField tf1, tf2, tf3, tf4;
  51  * // a blank text field
  52  * tf1 = new TextField();
  53  * // blank field of 20 columns
  54  * tf2 = new TextField("", 20);
  55  * // predefined text displayed
  56  * tf3 = new TextField("Hello!");
  57  * // predefined text in 30 columns
  58  * tf4 = new TextField("Hello", 30);
  59  * </pre></blockquote><hr>
  60  * <p>
  61  * Every time the user types a key in the text field, one or
  62  * more key events are sent to the text field.  A {@code KeyEvent}
  63  * may be one of three types: keyPressed, keyReleased, or keyTyped.
  64  * The properties of a key event indicate which of these types
  65  * it is, as well as additional information about the event,

   1 /*
   2  * Copyright (c) 1995, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any

  24  */
  25 package java.awt;
  26 
  27 import java.awt.peer.TextFieldPeer;
  28 import java.awt.event.*;
  29 import java.util.EventListener;
  30 import java.io.ObjectOutputStream;
  31 import java.io.ObjectInputStream;
  32 import java.io.IOException;
  33 import javax.accessibility.*;
  34 
  35 
  36 /**
  37  * A {@code TextField} object is a text component
  38  * that allows for the editing of a single line of text.
  39  * <p>
  40  * For example, the following image depicts a frame with four
  41  * text fields of varying widths. Two of these text fields
  42  * display the predefined text {@code "Hello"}.
  43  * <p>
  44  * <img src="doc-files/TextField-1.gif" alt="The preceding text describes this
  45  * image." style="margin: 7px 10px;">
  46  * <p>
  47  * Here is the code that produces these four text fields:
  48  *
  49  * <hr><blockquote><pre>
  50  * TextField tf1, tf2, tf3, tf4;
  51  * // a blank text field
  52  * tf1 = new TextField();
  53  * // blank field of 20 columns
  54  * tf2 = new TextField("", 20);
  55  * // predefined text displayed
  56  * tf3 = new TextField("Hello!");
  57  * // predefined text in 30 columns
  58  * tf4 = new TextField("Hello", 30);
  59  * </pre></blockquote><hr>
  60  * <p>
  61  * Every time the user types a key in the text field, one or
  62  * more key events are sent to the text field.  A {@code KeyEvent}
  63  * may be one of three types: keyPressed, keyReleased, or keyTyped.
  64  * The properties of a key event indicate which of these types
  65  * it is, as well as additional information about the event,