JDK1.5 provides a mechanism to create a pool a scheduled task

    
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class Main{

  public static void main(String args[]) {
    ScheduledThreadPoolExecutor stpe = new ScheduledThreadPoolExecutor(5);
    
    stpe.scheduleAtFixedRate(new Job1(), 0, 5, TimeUnit.SECONDS);
    stpe.scheduleAtFixedRate(new Job2(), 1, 2, TimeUnit.SECONDS);
  }
}

class Job1 implements Runnable {
  public void run() {
    System.out.println("Job 1");
  }
}

class Job2 implements Runnable {
  public void run() {
      for(int i=-99;i<99;i++){
        System.out.println(i);
      }
  }
}

1.	Defining a thread for a thread pool
2.	Thread pool demo
3.	Thread Pools 1
4.	Thread Pools 2
5.	Thread pool
6.	Thread Pool 2
7.	Thread Pool Test
8.	Very basic implementation of a thread pool
9.	Thread Cache
10.	Simple pool of Threads
11.	Worker thread pool
12.	Create a new thread for the thread pool. The create thread will be a daemon thread.
13.	Simple thread pool. A task is executed by obtaining a thread from the pool
14.	Simple object pool. Based on ThreadPool and few other classes
15.	A utility class that receives a collection of tasks to execute internally and then distributes the tasks among a thread pool.

JDK1.5 provides a mechanism to create a pool a scheduled task : Thread Pool « Threads « Java

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