public class Queue
{
	private DVListe queue = new DVListe();
	
	public void offer(Object o)
	{
		this.queue.addLast(o);
	}
	
	public Object poll()
	{
		Object o = this.queue.getFirst();
		
		if (o != null)
		{
			this.queue.removeFirst();
		}
		
		return o;
	}
	
	public Object peek()
	{
		return this.queue.getFirst();
	}
	
	public static void main(String[] args)
	{
		Queue q = new Queue();
		q.offer("1");
		q.offer("2");
		q.offer("3");
		q.offer("4");
		q.offer("5");
		
		System.out.println(q.peek());
		System.out.println(q.peek());
		
		System.out.println();
		
		System.out.println(q.poll());
		System.out.println(q.poll());
		System.out.println(q.poll());
		System.out.println(q.poll());
		System.out.println(q.poll());
		
		System.out.println();
		
		System.out.println(q.poll());
		System.out.println(q.peek());
	}
}