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Java Source | 2000-05-25 | 4.6 KB | 136 lines |
- //: TextNew.java
- //////////////////////////////////////////////////
- // Copyright (c) Bruce Eckel, 1998
- // Source code file from the book "Thinking in Java"
- // All rights reserved EXCEPT as allowed by the
- // following statements: You can freely use this file
- // for your own work (personal or commercial),
- // including modifications and distribution in
- // executable form only. Permission is granted to use
- // this file in classroom situations, including its
- // use in presentation materials, as long as the book
- // "Thinking in Java" is cited as the source.
- // Except in classroom situations, you cannot copy
- // and distribute this code; instead, the sole
- // distribution point is http://www.BruceEckel.com
- // (and official mirror sites) where it is
- // freely available. You cannot remove this
- // copyright and notice. You cannot distribute
- // modified versions of the source code in this
- // package. You cannot use this file in printed
- // media without the express permission of the
- // author. Bruce Eckel makes no representation about
- // the suitability of this software for any purpose.
- // It is provided "as is" without express or implied
- // warranty of any kind, including any implied
- // warranty of merchantability, fitness for a
- // particular purpose or non-infringement. The entire
- // risk as to the quality and performance of the
- // software is with you. Bruce Eckel and the
- // publisher shall not be liable for any damages
- // suffered by you or any third party as a result of
- // using or distributing software. In no event will
- // Bruce Eckel or the publisher be liable for any
- // lost revenue, profit, or data, or for direct,
- // indirect, special, consequential, incidental, or
- // punitive damages, however caused and regardless of
- // the theory of liability, arising out of the use of
- // or inability to use software, even if Bruce Eckel
- // and the publisher have been advised of the
- // possibility of such damages. Should the software
- // prove defective, you assume the cost of all
- // necessary servicing, repair, or correction. If you
- // think you've found an error, please email all
- // modified files with clearly commented changes to:
- // Bruce@EckelObjects.com. (Please use the same
- // address for non-code errors found in the book.)
- /////////////////////////////////////////////////
-
- // Text fields with Java 1.1 events
- import java.awt.*;
- import java.awt.event.*;
- import java.applet.*;
-
- public class TextNew extends Applet {
- Button
- b1 = new Button("Get Text"),
- b2 = new Button("Set Text");
- TextField
- t1 = new TextField(30),
- t2 = new TextField(30),
- t3 = new TextField(30);
- String s = new String();
- public void init() {
- b1.addActionListener(new B1());
- b2.addActionListener(new B2());
- t1.addTextListener(new T1());
- t1.addActionListener(new T1A());
- t1.addKeyListener(new T1K());
- add(b1);
- add(b2);
- add(t1);
- add(t2);
- add(t3);
- }
- class T1 implements TextListener {
- public void textValueChanged(TextEvent e) {
- t2.setText(t1.getText());
- }
- }
- class T1A implements ActionListener {
- private int count = 0;
- public void actionPerformed(ActionEvent e) {
- t3.setText("t1 Action Event " + count++);
- }
- }
- class T1K extends KeyAdapter {
- public void keyTyped(KeyEvent e) {
- String ts = t1.getText();
- if(e.getKeyChar() ==
- KeyEvent.VK_BACK_SPACE) {
- // Ensure it's not empty:
- if( ts.length() > 0) {
- ts = ts.substring(0, ts.length() - 1);
- t1.setText(ts);
- }
- }
- else
- t1.setText(
- t1.getText() +
- Character.toUpperCase(
- e.getKeyChar()));
- t1.setCaretPosition(
- t1.getText().length());
- // Stop regular character from appearing:
- e.consume();
- }
- }
- class B1 implements ActionListener {
- public void actionPerformed(ActionEvent e) {
- s = t1.getSelectedText();
- if(s.length() == 0) s = t1.getText();
- t1.setEditable(true);
- }
- }
- class B2 implements ActionListener {
- public void actionPerformed(ActionEvent e) {
- t1.setText("Inserted by Button 2: " + s);
- t1.setEditable(false);
- }
- }
- public static void main(String[] args) {
- TextNew applet = new TextNew();
- Frame aFrame = new Frame("TextNew");
- aFrame.addWindowListener(
- new WindowAdapter() {
- public void windowClosing(WindowEvent e) {
- System.exit(0);
- }
- });
- aFrame.add(applet, BorderLayout.CENTER);
- aFrame.setSize(300,200);
- applet.init();
- applet.start();
- aFrame.setVisible(true);
- }
- } ///:~