How do I get all nodes in a parent in JavaFX?

This seems to get ALL nodes. (In Kotlin)

fun getAllNodes(root: Parent): ArrayList<Node> {
    var nodes = ArrayList<Node>()
    fun recurseNodes(node: Node) {
        nodes.add(node)
        if(node is Parent)
            for(child in node.childrenUnmodifiable) {
                recurseNodes(child)
            }
    }
    recurseNodes(root)
    return nodes
}

public static ArrayList<Node> getAllNodes(Parent root) {
    ArrayList<Node> nodes = new ArrayList<Node>();
    addAllDescendents(root, nodes);
    return nodes;
}

private static void addAllDescendents(Parent parent, ArrayList<Node> nodes) {
    for (Node node : parent.getChildrenUnmodifiable()) {
        nodes.add(node);
        if (node instanceof Parent)
            addAllDescendents((Parent)node, nodes);
    }
}

I use this,

public class NodeUtils {

    public static <T extends Pane> List<Node> paneNodes(T parent) {
        return paneNodes(parent, new ArrayList<Node>());
    }

    private static <T extends Pane> List<Node> paneNodes(T parent, List<Node> nodes) {
        for (Node node : parent.getChildren()) {
            if (node instanceof Pane) {
                paneNodes((Pane) node, nodes);
            } else {
                nodes.add(node);
            }
        }

        return nodes;
    }
}

Usage,

List<Node> nodes = NodeUtils.paneNodes(aVBoxOrAnotherContainer);

This source code uses the references of the existing nodes. It does not clone them.