Застрял на добавлении детей в список экземпляра класса.

JavaProject.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+ <component name="NewModuleRootManager" inherit-compiler-output="true">
+ <exclude-output />
+ <content url="file://$MODULE_DIR$">
+ <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+ </content>
+ <orderEntry type="inheritedJdk" />
+ <orderEntry type="sourceFolder" forTests="false" />
+ </component>
+</module>

src/ru/gb/FamilyTree/FamilyTree.java

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+package ru.gb.FamilyTree;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class FamilyTree {
+ List<Human> list;
+
+ @Override
+ public String toString() {
+ return
+ "FamilyTree{" +
+ "list=" + list +
+ '}';
+ }
+}
+

src/ru/gb/FamilyTree/Gender.java

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+package ru.gb.FamilyTree;
+
+public enum Gender {
+ Male, Female;
+}

src/ru/gb/FamilyTree/Human.java

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+package ru.gb.FamilyTree;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.List;
+
+public class Human {
+ private String name;
+ private LocalDate dob, dod;
+ private Gender gender;
+ private List<Human> children;
+ private Human mother, father;
+
+ public Human(String name, LocalDate dob, LocalDate dod, Gender gender, List<Human> children, Human mother, Human father) {
+ this.name = name;
+ this.dob = dob;
+ this.dod = dod;
+ this.gender = gender;
+ this.children = children;
+ this.mother = mother;
+ this.father = father;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public void setName(String name) {
+ this.name = name;
+ }
+
+ public LocalDate getDob() {
+ return dob;
+ }
+
+ public void setDob(LocalDate dob) {
+ this.dob = dob;
+ }
+
+ public LocalDate getDod() {
+ return dod;
+ }
+
+ public void setDod(LocalDate dod) {
+ this.dod = dod;
+ }
+
+ public Gender getGender() {
+ return gender;
+ }
+
+ public void setGender(Gender gender) {
+ this.gender = gender;
+ }
+
+ public List<Human> getChildren() {
+ return children;
+ }
+
+ public void setChildren(List<Human> children) {
+ this.children = children;
+ }
+
+ public Human getMother() {
+ return mother;
+ }
+
+ public void setMother(Human mother) {
+ this.mother = mother;
+ }
+
+ public Human getFather() {
+ return father;
+ }
+
+ public void setFather(Human father) {
+ this.father = father;
+ }
+
+ @Override
+ public String toString() {
+ return "Human{" +
+ "name='" + name + '\'' +
+ ", dob=" + dob +
+ ", dod=" + dod +
+ ", gender=" + gender +
+ ", children=" + children +
+ ", mother=" + mother +
+ ", father=" + father +
+ '}';
+ }
+}
+
+

src/ru/gb/FamilyTree/Main.java

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+package ru.gb.FamilyTree;
+
+import java.time.LocalDate;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class Main {
+ public static void main(String[] args) {
+
+ Human human1 = new Human("Дмитрий", LocalDate.of(1981,3,17),
+ null, Gender.Male, null, null,null);
+ Human human2 = new Human("Валерия", LocalDate.of(2005, 10, 5),
+ null,Gender.Female,null, null, human1);
+ Human human3 = new Human("Алина", LocalDate.of(1980,6,4),
+ null,Gender.Female, null,null,null);
+ Human human4 = new Human("Наталья", LocalDate.of(1961,6,1),
+ null, Gender.Female, null, null, null);
+ Human human5 = new Human("Александр", LocalDate.of(1956,12,9),
+ null, Gender.Male, null, null, null);
+ Human human6 = new Human("Маргарита", LocalDate.of(1932,2,23),
+ null, Gender.Female, null, null, null);
+ Human human7 = new Human("Борис", LocalDate.of(1931,8,12),
+ LocalDate.of(2008,8,16), Gender.Male, null, null, null);
+
+ human1.setChildren(List.of(human2));
+
+
+ FamilyTree familyTree = new FamilyTree();
+ familyTree.list = new ArrayList<>();
+ familyTree.list.add(human1);
+ familyTree.list.add(human2);
+ familyTree.list.add(human3);
+ familyTree.list.add(human4);
+ familyTree.list.add(human5);
+ familyTree.list.add(human6);
+ familyTree.list.add(human7);
+
+ System.out.println(human1);
+
+
+
+ }
+}