// +---+---+---+
//enqueue -> | 3 | 2 | 1 | -> dequeue
// +---+---+---+
//enqueue: to place something into a queue;
//to add an element to the tail of a queue;
//dequeue: to take something out of a queue;
//to remove the first available element from the head of a queue
public Procesador()
{
primero = null;
ultimo = null;
}