Membuat scheduler atau proses periodik

Kita bisa menggunakan Timer seperti ini:

int initialDelay = 30000; // start after 30 seconds
int period = 5000;        // repeat every 5 seconds
Timer timer = new Timer();
TimerTask task = new TimerTask() {
  public void run() {
    // job code here
  }
};
timer.scheduleAtFixedRate(task, initialDelay, period);

Atau menggunakan EDU.oswego.cs.dl.util.concurrent.ClockDaemon seperti ini:

    static protected ClockDaemon clockDaemon = new ClockDaemon();

    static
    {
       log.debug("Setting the clockDaemon's thread factory");
       clockDaemon.setThreadFactory(new ThreadFactory()
       {
          public Thread newThread(Runnable r)
          {
             Thread t = new Thread(getThreadGroup(), r, "ThreadDaemon");
             t.setDaemon(true);
             return t;
          }
       });
    }

    public static ThreadGroup getThreadGroup()
    {
       if (threadGroup.isDestroyed())
          threadGroup = new ThreadGroup("Our Threads");
       return threadGroup;
    }


    public static void main(String[] args)
    {
       int period = 500; //millis
       clockDaemon.executePeriodically(
         period, 
         new Runnable() {
           public void run() {
             System.out.println("Running...");
           }           
         }, 
         true);

    }

Atau menggunakan Quartz, job scheduling system.