public class ScheduledExecutorService {

	/**
	* Creates and executes a one-shot action that becomes enabled after the given delay.
	*/
	public void schedule(Runnable command, long delay, TimeUnit unit) {
	}

	/**
	* Creates and executes a periodic action that becomes enabled first after the given initial delay, and 
	* subsequently with the given period; that is executions will commence after initialDelay then 
	* initialDelay+period, then initialDelay + 2 * period, and so on.
	*/
	public void scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) {
	}

	/*
	* Creates and executes a periodic action that becomes enabled first after the given initial delay, and 
	* subsequently with the given delay between the termination of one execution and the commencement of the next.
	*/
	public void scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) {
	}

}