resize()

/* Create a new internal array with a given capacity */
@SuppressWarnings("unchecked")
private void resize(int capacity) {
    Item[] copy = (Item[]) new Comparable[capacity];        // 1
    for (int i = 1; i <= length; i++) {                     // 2
        copy[i] = pq[i];                                    // 2
    }
    pq = copy;                                              // 3
}