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Question about the task

Under discussion

Why is the output this: [Name: jose, sex: male, age: 55, children: jose, maria, Name: maria, sex: female, age: 56, children: jose, maria] [Name: mario, sex: male, age: 57, children: jose, maria, Name: ze, sex: female, age: 54, children: jose, maria] [Name: gaspar, sex: male, age: 35, children: mario, ze, Name: constanca, sex: female, age: 34, children: mario, ze] [Name: Thomas, sex: male, age: 2, children: gaspar, constanca, Name: gabriel, sex: male, age: 2, children: gaspar, constanca, Name: jose, sex: male, age: 5, children: gaspar, constanca] When i have separate them in groups?

1. Create a Human class with String name, boolean sex, int age, and ArrayList<Human> children fields.
2. Create and populate objects so that we end up with: two grandfathers, two grandmothers, one father, one mother, and three children.
3. Display all the Human objects (Hint: use the Human class's toString() method).

Requirements:

The program should display text on the screen.
The Human class must have four fields.
The Human class must have one method.
The Solution class must have one method.
The program should create objects and fill them with data to get two grandfathers, two grandmothers, one father, one mother, and three children. Then it should display all the Human objects on the screen.

package com.codegym.task.task08.task0824; import java.sql.SQLOutput; import java.util.ArrayList; import java.util.Collections; public class Solution { public static void main(String[] args) { //write your code here ArrayList<Human> one = new ArrayList<>(); ArrayList<Human> two = new ArrayList<>(); ArrayList<Human> three = new ArrayList<>(); ArrayList<Human> four = new ArrayList<>(); Human grandfather1 = new Human("jose", true, 55, one); Human grandmother1 = new Human("maria", false, 56, one); Human father = new Human("gaspar", true,35, two); Human grandfather2 = new Human("mario", true, 57, one); Human grandmother2 = new Human("ze", false, 54, one); Human mother = new Human("constanca", false, 34, two); Human child1 = new Human("Thomas", true, 2, three); Human child2 = new Human("gabriel", true, 2, three); Human child3 = new Human("jose", true, 5, three); Collections.addAll(one,grandfather1, grandmother1); Collections.addAll(two,grandfather2, grandmother2); Collections.addAll(three,father,mother); Collections.addAll(four,child1, child2, child3); System.out.println(one.toString()); System.out.println(two.toString()); System.out.println(three.toString()); System.out.println(four.toString()); } public static class Human { //write your code here ArrayList<Human> children = new ArrayList<>(); String name; boolean sex; int age; public Human(String name, boolean sex, int age, ArrayList<Human> children) { this.name = name; this.sex = sex; this.age = age; this.children = children; } public String toString() { String text = ""; text += "Name: " + this.name; text += ", sex: " + (this.sex ? "male" : "female"); text += ", age: " + this.age; int childCount = this.children.size(); if (childCount > 0) { text += ", children: " + this.children.get(0).name; for (int i = 1; i < childCount; i++) { Human child = this.children.get(i); text += ", " + child.name; } } return text; } } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

23 November 2019, 17:11

You are outputting the arrayList where you should be outputting human objects that your created. There is another big problem in your code in that the family inheritance is all over the place. The arraylists should contain the children for each object. At lines 16 and 17, you pass in the ArrayList 'one' into the constructors for those 2 objects, then at line 26 you add those same 2 objects to that list. in essence this code says that they are the parents of themselves. You need to go back and redo all the inheritance properly.