Tree

package com.javagists.examples.tree;

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

public class Tree {
    public static void main(String[] args) {
        Tree.Node<String> root = createTree();
        printTree(root, "*");
    }


    private static Node<String> createTree() {
        Tree.Node<String> root = new Tree.Node<>("Пенка и Велислав");

        Tree.Node<String> father = root.addChild(new Tree.Node<String>("Валентин"));

        Tree.Node<String> sister = father.addChild(new Tree.Node<String>("Олимпия"));
        Tree.Node<String> me = father.addChild(new Tree.Node<String>("Валентина"));



        return root;
    }


    private static <T> void printTree(Tree.Node<T> node, String appender) {
        System.out.println(appender + node.getData());
        node.getChildren().forEach(each -> printTree(each, appender + appender));
    }

    static class Node<T> {

        private T data = null;

        private List<Tree.Node<T>> children = new ArrayList<>();

        private Tree.Node<T> parent = null;

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

        public Tree.Node<T> addChild(Tree.Node<T> child) {
            child.setParent(this);
            this.children.add(child);
            return child;
        }

        public void addChildren(List<Tree.Node<T>> children) {
            children.forEach(each -> each.setParent(this));
            this.children.addAll(children);
        }

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

        public T getData() {
            return data;
        }

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

        private void setParent(Tree.Node<T> parent) {
            this.parent = parent;
        }

        public Tree.Node<T> getParent() {
            return parent;
        }



    }
}