int taskid;
taskid = getServer().getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {

	public void run()
	{
        	System.out.println("1st task firing");
        }
}, 20L, 20L);
getServer().getScheduler().scheduleSyncDelayedTask(this, new Runnable() {

         public void run()
         {
         	System.out.println("1st task cancelled");
                getServer().getScheduler().cancelTask(taskid);
          }
 }, 100L);
getServer().getScheduler().scheduleSyncDelayedTask(this, new Runnable() {

	public void run()
        {
        	System.out.println("3rd task fired");
        }
}, 200L);