public void insert(int val) {
      int next = (end + 1) % queue.length;
                           // wrap around
 //      if ( next == front )
 //         expand the array, or
 //         throw new QueueFullException();
      queue[end] = val;
      end = next; }

    public int remove () {
        int val = queue[front];
        front = (front + 1) % queue.length;
                            // wrap around
        return val; }

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