Queues

public static<T> boolean isThere(Queue<T> queue , T a )
    {
        while(!queue.isEmpty())
        {
            if(a == queue.head())
                return true;
            else
                queue.remove();
        }
        return false;
    }

    public static Queue<Integer> createIntQueue()
    {
        Queue<Integer> queue = new Queue<Integer>();
        System.out.println("Enter first value for queue");
        int temp = UI.nextInt();
        while(temp != 999)
        {
            queue.insert(temp);
            System.out.println("Enter next value (999 to stop)");
            temp = UI.nextInt();
        }
        return queue;
    }

    public static<T> Queue<T> duplicate(Queue<T> queue)
    {
        Queue<T> duplicate = new Queue<T>();
        Queue<T> temp = new Queue<T>();
        while(!queue.isEmpty())
        {
            duplicate.insert(queue.head());
            temp.insert(queue.remove());
        }

        while(!temp.isEmpty())
            queue.insert(temp.remove());

        return duplicate;
    }

    public static Queue<Integer> count(Queue<Integer> Q)
    {

    }

    public static Queue<Integer> Q_By_Appearance(Queue<Integer> Q)
    {
        int temp;
        Queue<Integer> Q2 = duplicate(Q);
        Queue<Integer> Qapp = new Queue<Integer>();
        while(!Q2.isEmpty())
        {
            temp = Q2.head();
            Qapp.insert(temp);

        }
    }

    public static int sumQueue(Queue<Integer> Q)
    {
        int sum = 0;
        while(!Q.isEmpty())
        {
            sum += Q.remove();
        }
        return sum;
    }