Подскажите, в чем тут проблема, пожалуйста....
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) {
ArrayList<Human> grandParents = new ArrayList<>();
ArrayList<Human> parent1 = new ArrayList<>();
ArrayList<Human> parent2 = new ArrayList<>();
ArrayList<Human> childrens = new ArrayList<>();
Human grandPa = new Human("Mark", true, 75, parent1);
Human grandMa = new Human("Janice", false, 73,parent1);
Human grandPa2 = new Human("Hugh", true, 72, parent2);
Human grandMa2 = new Human("Alice", false, 70, parent2);
grandParents.add(grandPa);
grandParents.add(grandMa);
grandParents.add(grandPa2);
grandParents.add(grandMa2);
Human dad = new Human("James",true, 40, childrens);
Human mom = new Human("Ann", false, 35, childrens);
parent1.add(dad);
parent2.add(mom);
Human child1 = new Human("Andrew", true, 16);
Human child2 = new Human("Molly", false, 10);
Human child3 = new Human("Joe", true, 19);
childrens.add(child1);
childrens.add(child2);
childrens.add(child3);
System.out.println(grandPa.toString());
System.out.println(grandMa.toString());
System.out.println(grandPa2.toString());
System.out.println(grandMa2.toString());
System.out.println(dad.toString());
System.out.println(mom.toString());
System.out.println(child1.toString());
System.out.println(child2.toString());
System.out.println(child3.toString());
}
public static class Human {
public String name;
public Boolean sex;
public int age;
public ArrayList<Human> children;
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, ArrayList children){
this.name = name;
this.sex = sex;
this.age = age;
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;
}
}
}