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Java Source | 2000-05-25 | 4.5 KB | 131 lines |
- //: Counter4.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.)
- /////////////////////////////////////////////////
-
- // If you separate your thread from the main
- // class, you can have as many threads as you
- // want.
- import java.awt.*;
- import java.awt.event.*;
- import java.applet.*;
-
- class Ticker extends Thread {
- private Button b = new Button("Toggle");
- private TextField t = new TextField(10);
- private int count = 0;
- private boolean runFlag = true;
- public Ticker(Container c) {
- b.addActionListener(new ToggleL());
- Panel p = new Panel();
- p.add(t);
- p.add(b);
- c.add(p);
- }
- class ToggleL implements ActionListener {
- public void actionPerformed(ActionEvent e) {
- runFlag = !runFlag;
- }
- }
- public void run() {
- while (true) {
- if(runFlag)
- t.setText(Integer.toString(count++));
- try {
- sleep(100);
- } catch (InterruptedException e){}
- }
- }
- }
-
- public class Counter4 extends Applet {
- private Button start = new Button("Start");
- private boolean started = false;
- private Ticker[] s;
- private boolean isApplet = true;
- private int size;
- public void init() {
- // Get parameter "size" from Web page:
- if(isApplet)
- size =
- Integer.parseInt(getParameter("size"));
- s = new Ticker[size];
- for(int i = 0; i < s.length; i++)
- s[i] = new Ticker(this);
- start.addActionListener(new StartL());
- add(start);
- }
- class StartL implements ActionListener {
- public void actionPerformed(ActionEvent e) {
- if(!started) {
- started = true;
- for(int i = 0; i < s.length; i++)
- s[i].start();
- }
- }
- }
- public static void main(String[] args) {
- Counter4 applet = new Counter4();
- // This isn't an applet, so set the flag and
- // produce the parameter values from args:
- applet.isApplet = false;
- applet.size =
- (args.length == 0 ? 5 :
- Integer.parseInt(args[0]));
- Frame aFrame = new Frame("Counter4");
- aFrame.addWindowListener(
- new WindowAdapter() {
- public void windowClosing(WindowEvent e) {
- System.exit(0);
- }
- });
- aFrame.add(applet, BorderLayout.CENTER);
- aFrame.setSize(200, applet.size * 50);
- applet.init();
- applet.start();
- aFrame.setVisible(true);
- }
- } ///:~