Не выводит на печать содержимое объекта

package com.javarush.task.task08.task0824; import java.util.ArrayList; import java.util.List; /* Собираем семейство */ public class Solution { public static void main(String[] args) { //напишите тут ваш код ArrayList<Human> children1 = new ArrayList<Human>(); ArrayList<Human> children2 = new ArrayList<Human>(); ArrayList<Human> children3 = new ArrayList<Human>(); Human son1 = new Human("Сын1", true, 15); Human son2 = new Human("Сын2", true, 7); Human daughter1 = new Human("Дочь", false, 12); children1.add(son1); children1.add(son2); children1.add(daughter1); Human father = new Human("Отец", true, 35, children1); Human mother = new Human("Мать", false, 33, children1); children2.add(father); children3.add(mother); Human grandfather1 = new Human("Дедушка1", true, 60, children2); Human grandmother1 = new Human("Бабушка1", false, 55, children2); Human grandfather2 = new Human("Дедушка2", true, 58, children3); Human grandmother2 = new Human("Бабушка2", false,53, children3); System.out.println(grandfather1.age); // System.out.println(son2.toString()); // System.out.println(daughter1.toString()); // System.out.println(father.toString()); // System.out.println(mother.toString()); } public static class Human { //напишите тут ваш код String name; boolean sex; int age; ArrayList <Human> children = new ArrayList<>(); Human(String name, boolean sex, int age){ name=this.name; sex=this.sex; age=this.age; } Human(String name, boolean sex, int age, ArrayList<Human> children){ name=this.name; sex=this.sex; age=this.age; children=this.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; } } }