/*

import java.util.ArrayList;

import java.util.List;


import java.util.ArrayList;
import java.util.List;

public class Node<T> {

    private T data;
    private final List<Node<T>> children = new ArrayList<>();

    public Node(T data) {
        this.data = data;
    }

    public Node<T> addChild(Node<T> node) {
        children.add(node);
        return node;
    }

    public Node<T> addChild(T data) {   
        
        ????????????????????????????????????????????????????????????????
???????????????????????????????????????????
    }
    
    public List<Node<T>> iterate() {
        return children;
    }

    public void remove(Node<T> node) {
        children.remove(node);
    }

    public List<Node<T>> getChildren() {
        return children;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}

public class TreePrint {

    public static void main(String[] args) {

        Tree<String> rootFolder = new Tree<>("RootFolder");

        Node<String> rootNode = rootFolder.getRoot();
        
        Node<String> video = new Node<>("Video");
        Node<String> music = new Node<>("Music");
        Node<String> picture = new Node<>("Picture");
        
        rootNode.addChild(video);
        rootNode.addChild(music);
        rootNode.addChild(picture);

        video.addChild(new Node<>("Terminator"));
        video.addChild(new Node<>("Die Hard"));
        video.addChild(new Node<>("Rocky"));
        music.addChild(new Node<>("Eminem"));
        picture.addChild(new Node<>("Picasso"));
        
        
        
        Tree<String> rootFolder1 = new Tree<>("RootFolder1");
        
        
        printCatalog(rootFolder);

    }

    private static <T> void printCatalog(Tree<T> rootFolder) {
        printNode(rootFolder.getRoot());
        List<Node<T>> kids = rootFolder.iterate();
        printTree(kids);
    }

    private static <T> void printTree(List<Node<T>> kids) {
        if (kids.isEmpty()) {
            return;
        }
        for (Node<T> kid : kids) {
            printNode(kid);
            printTree(kid.getChildren());
        }
    }

    private static <T> void printNode(Node<T> kid) {
        System.out.println(kid.getData());

    }
}

   public void addChild(T data) {
        Node<T> node = new Node<>(data);        
        node.parent = this;
        children.add(node);
    }

public void addChild(T data) {
        Node<T> node = new Node<>(data);        
        node.parent = this;
        children.add(node);
    }

public Node<T> addChild(T data) {
вот такой метод??
}

 public Node<T> addChild(T data) {   
        addChild(new Node<>(data));
        return null;
    }