class QuadTreeNode extends AbstractTreeNode<D, N> {

	@Override
	@Pure
	public int getNotNullChildCount() {
		return this.notNullChildCount;
	}

	public  QuadTreeNode();
	public  QuadTreeNode(Collection<D> data);
	public  QuadTreeNode(D data);
	public  QuadTreeNode(boolean useLinkedList);
	public  QuadTreeNode(boolean useLinkedList, boolean copyDataCollection, List<D> data);
	public  QuadTreeNode(boolean useLinkedList, D data);

}