Counter4.java


</COMMENT> No Java 2 support for APPLET!!

//: 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. 
// <applet code=Counter4 width=200 height=600>
// <param name=size value="12"></applet>
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 < 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 < 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);
  }
} ///:~