package tree;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import javax.swing.tree.TreeNode;


public class TreePrint {
	
    public static void main(String[] args) {
        
        Tree<String> rootFolder = new Tree<>("RootFolder"); 
        
        Node<String> video = new Node<>("Video"); 
        Node<String> music = new Node<>("Music"); 
        Node<String> picture = new Node<>("Picture");
        
        video.addChild("Terminator");
        video.addChild("Die Hard");
        video.addChild("Rocky");
        music.addChild("Eminem");
        picture.addChild("Picasso");
        
        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());

    }

}

package tree;

import java.util.List;

class Tree<T> {

    private Node<T> root = null;
    
    public Tree(T data) {
        root = new Node(data);
    }
    
    public Node getRoot() {
        return root;
    }

    <T> List<Node<T>> iterate() {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
}
	

package tree;

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

public class Node<T> {

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

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

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

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

    public Node getParent() {
        return parent;
    }

    
    public T getData() {
        return data;
    }

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

}