main() pq

public static void main(String[] args) {

    BinaryHeap<Integer> heap = new BinaryHeap<Integer>();

    heap.insert(4);
    heap.insert(10);
    heap.insert(-5);
    heap.insert(7);

    System.out.println("current max: " + heap.delMax());
    System.out.println("current max: " + heap.delMax());
    System.out.println("current max: " + heap.delMax());
    System.out.println("heap size: " + heap.size());
    System.out.println("current max: " + heap.delMax());
}