📄 counter4frame.html

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<html><head><title>Display page for Counter4 at www.BruceEckel.com</title></head><FONT FACE="Verdana,Tahoma,Arial,Helvetica,Sans"><H2>Counter4.java</H2><hr></FONT>
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
    width="200" height="600" align="baseline"
    codebase="http://java.sun.com/products/plugin/1.2.2/jinstall-1_2_2-win.cab#Version=1,2,2,0">
<PARAM NAME="code" VALUE="Counter4.class">
<PARAM NAME="codebase" VALUE=".">
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.2.2">
<COMMENT>
    <EMBED type="application/x-java-applet;version=1.2.2" 
       width="200" height="600" align="baseline" 
       code="Counter4.class" 
       codebase="."
       pluginspage="http://java.sun.com/products/plugin/1.2/plugin-install.html">
    <NOEMBED>
    </COMMENT>
       No Java 2 support for APPLET!!
    </NOEMBED></EMBED>
</OBJECT>
<FONT SIZE="+3"><PRE><B>
//: c14:Counter4.java
// From 'Thinking in Java, 2nd ed.' by Bruce Eckel
// www.BruceEckel.com. See copyright notice in CopyRight.txt.
// By keeping your thread as a distinct class,
// you can have as many threads as you want. 
// &lt;applet code=Counter4 width=200 height=600&gt;
// &lt;param name=size value="12"&gt;&lt;/applet&gt;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import com.bruceeckel.swing.*;

public class Counter4 extends JApplet {
  private JButton start = new JButton("Start");
  private boolean started = false;
  private Ticker[] s;
  private boolean isApplet = true;
  private int size = 12;
  class Ticker extends Thread {
    private JButton b = new JButton("Toggle");
    private JTextField t = new JTextField(10);
    private int count = 0;
    private boolean runFlag = true;
    public Ticker() {
      b.addActionListener(new ToggleL());
      JPanel p = new JPanel();
      p.add(t);
      p.add(b);
      // Calls JApplet.getContentPane().add():
      getContentPane().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) {
          System.err.println("Interrupted");
        }
      }
    }
  }
  class StartL implements ActionListener {
    public void actionPerformed(ActionEvent e) {
      if(!started) {
        started = true;
        for (int i = 0; i &lt; s.length; i++)
          s[i].start();
      }
    }
  }
  public void init() {
    Container cp = getContentPane();
    cp.setLayout(new FlowLayout());
    // Get parameter "size" from Web page:
    if (isApplet) {
      String sz = getParameter("size");
      if(sz != null)
        size = Integer.parseInt(sz);
    }
    s = new Ticker[size];
    for (int i = 0; i &lt; s.length; i++)
      s[i] = new Ticker();
    start.addActionListener(new StartL());
    cp.add(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;
    if(args.length != 0)
      applet.size = Integer.parseInt(args[0]);
    Console.run(applet, 200, applet.size * 50);
  }
} ///:~
</B></PRE></FONT></body></html>
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