Creating Threads That Work Together - Java Thread

Java examples for Thread:Thread Operation

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Description

Creating Threads That Work Together

Demo Code

import java.util.ArrayList;

public class CountDownApp
{
  public static void main(String[] args)
  {//from   w ww  .  j av  a2s  . c  o  m
    CountDownClock clock = new CountDownClock(20);

    ArrayList<Runnable> events = new ArrayList<Runnable>();
    events.add(new LaunchEvent(16, "A", clock));
    events.add(new LaunchEvent(6, "B", clock));
    events.add(new LaunchEvent(0, "C", clock));

    clock.start();

    for (Runnable e : events)
      new Thread(e).start();
    }
}

interface TimeMonitor
{
  int getTime();
}

class CountDownClock extends Thread implements TimeMonitor
{
  private int t;

  public CountDownClock(int start)
  {
    this.t = start;
  }

  public void run()
  {
    for (; t >= 0; t--)
    {
            System.out.println("T minus " + t);
            try
            {
                Thread.sleep(1000);
            }
            catch (InterruptedException e)
            {}
    }
  }

  public int getTime()
  {
    return t;
  }
}

class LaunchEvent implements Runnable
{
    private int start;
    private String message;
    TimeMonitor tm;

    public LaunchEvent(int start, String message,
      TimeMonitor monitor)
    {
        this.start = start;
        this.message = message;
        this.tm = monitor;
    }

  public void run()
  {
    boolean eventDone = false;
    while (!eventDone)
    {
      try
      {
        Thread.sleep(10);
      }
      catch (InterruptedException e)
      {}
      if (tm.getTime() <= start)
      {
        System.out.println(this.message);
        eventDone = true;
      }
    }
  }
}

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