Question

This is the first time I have really used Lists and Queues so this might be a very simple mistake. Is it because my queue is full of objects that can’t be cast to integers?

           //populate array
        for(int i=0; i<11; i++){
            numberarray[i] = i; 
        }
        // populate list with numbers from array
        List numList = Arrays.asList(numberarray);
        Collections.shuffle(numList);

        Queue queue = new LinkedList();
        queue.addAll(numList);

        int num1 = (Integer) queue.poll();
        assignPictures(button01, num1);

Answer 1

You really should use Generics and ArrayList/ArrayDeque unless it’s really performance critical and you use a lot of atomic types like int. Then you should have a look at
http://labs.carrotsearch.com/hppc.html