New to Java

I have a question about the collections group, in particular Queue.

If I have a statement like this:

Queue<E> queue = new LinkedList<E>();

Under which circumstances would it be beneficial to use it.
I used this in this code.

package generation;

import java.util.LinkedList;
import java.util.NoSuchElementException;
import java.util.Queue;

/**
 *
 * @author David
 */
public class EconomicLoadOrder<E>
{


    Queue<E> queue = new LinkedList<E>();

    public EconomicLoadOrder()
    {
        //Empty constructory
    }

    public void addGenerator(E gen)
    {
        this.queue.add(gen);
    }

    public E getNextGenerator() throws NoSuchElementException
    {
        return this.queue.remove();
    }
}

And I thought I would have been able to use the LinkedList method .pop(). in my getNextGenerator() method, but it seems I can only use the Queue method remove(). This is ok for what I want to do, but I just want to understand what is happening here and why this is so?
I don't intend on changing it, but is there a way of enableing my this.queue object calling poll() ?

regards