Всё работает, что не так то?

package com.javarush.task.jdk13.task08.task0824; import java.util.ArrayList; import java.util.Collections; import java.util.List; /* Вся семья в сборе */ public class Solution { public static void main(String[] args) { //напишите тут ваш код Human child1 = new Human("Ребёнок1", true, 23); Human child2 = new Human("Ребёнок2", false, 4); Human child3 = new Human("Ребёнок3", true, 1); Human father = new Human("Отец", true, 52, child1, child2, child3); Human mother = new Human("Мама", false, 49, child1, child2, child3); Human grandFatherMother = new Human("Дедушка1", true, 90, mother); Human grandMotherMother = new Human("Бабушка1", false, 86, mother); Human grandFatherFather = new Human("Дедушка2", true, 150, father); Human grandMotherFather = new Human("Бабушка2", false, 112, father); System.out.println(grandFatherFather.toString()); System.err.println(grandFatherMother.toString()); System.out.println(grandMotherFather.toString()); System.out.println(grandMotherMother.toString()); System.out.println(father.toString()); System.out.println(mother.toString()); System.out.println(child1.toString()); System.out.println(child2.toString()); System.out.println(child3.toString()); } public static class Human { //напишите тут ваш код String name; boolean sex; int age; List<Human>children = new ArrayList<>(); public Human(String name, boolean sex, int age) { this.name = name; this.sex = sex; this.age = age; } public Human(String name, boolean sex, int age, Human... children) { this.name = name; this.sex = sex; this.age = age; Collections.addAll(this.children, children); } 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; } } }