Уважаемые, подскажите

package com.javarush.task.task08.task0824; import java.util.*; /* Собираем семейство */ public class Solution { public static void main(String[] args) { //напишите тут ваш код ArrayList<Human> humans = new ArrayList<>(); ArrayList<Human> grandparents = new ArrayList<>(); ArrayList<Human> parents1 = new ArrayList<>(); ArrayList<Human> parents2 = new ArrayList<>(); ArrayList<Human> child = new ArrayList<>(); child.add(new Human("children1", 3, false, new ArrayList<Human>())); child.add(new Human("children2", 3, false, new ArrayList<Human>())); child.add(new Human("children3", 3, false, new ArrayList<Human>())); parents1.add(new Human("father", 43, true, child)); parents2.add(new Human("mother", 43, false, child)); grandparents.add(new Human("grandfather", 63, true, parents1)); grandparents.add(new Human("grandfather", 63, true, parents2)); grandparents.add(new Human("grandmother", 63, false, parents1)); grandparents.add(new Human("grandmother", 63, false, parents2)); humans.addAll(grandparents); humans.addAll(parents1); humans.addAll(parents2); humans.addAll(child); System.out.println(humans); } public static class Human { //напишите тут ваш код String name; int age; boolean sex; ArrayList<Human> children; public Human(String name, int age, boolean sex, ArrayList<Human> child){ this.name = name; this.age = age; this.sex = sex; children = new ArrayList<>(child); } public String toString() { String text = ""; text += "Имя: " + this.name; text += ", пол: " + (this.sex ? "мужской" : "женский"); text += ", возраст: " + this.age; int childCount = this.children.size(); if (childCount > 0) { text += ", дети: " + this.children.get(0).name; for (int i = 1; i < childCount; i++) { Human child = this.children.get(i); text += ", " + child.name; } } return text; } } }