java制作多个线程[Java编程]

//: Counter4.java
// 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);
  }
} ///:~