What the problem ?

Question about the task

Resolved

I read other help questions but still the problem.

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; /* Make a family */ import java.util.ArrayList; public class Solution { public static void main(String[] args) { //write your code here ArrayList<Human> children = new ArrayList<Human>(); ArrayList<Human> old = new ArrayList<Human>(); // initlaize child Human child1 = new Human("child1",true,15); Human child2 = new Human("child2",false,20); Human child3 = new Human("child3",true,10); // add child to arraylist children.add(child1); children.add(child2); children.add(child3); // intilize father & mother Human father = new Human("father",true,30,children); Human mother = new Human("mother",false,29,children); // add Father & mother to array list old.add(father); old.add(mother); //inistalize grfather and mother Human grandFathe1 = new Human("gf1",true,60,old); Human grandMother1 = new Human("gm", false,55,old); Human grandFathe2 = new Human("gf2",true,61,old); Human grandMother2 = new Human("gm2", false,54,old); System.out.println(grandFathe1.toString()); System.out.println(grandFathe2.toString()); System.out.println(grandMother1.toString()); System.out.println(grandMother2.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 { //write your code here String name; Boolean sex; int age; ArrayList<Human> children = new ArrayList<Human>(); public Human(String name, Boolean sex, int age, ArrayList children){ this.name = name; this.sex = sex; this.age = age; this.children = children; } public Human(String name, Boolean sex, int age){ this.name = name; this.sex = sex; this.age = age; } 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; } } }

Comments (4)

Popular
New
Old

You must be signed in to leave a comment

Isaiah Burkes

Level 16 , Tampa, United States

27 December 2019, 19:02

The grandfather1 and grandmother1 children field should return an ArrayList<Human> that contains either the father or the mother object. The grandfather2 and grandmother2 children field should return an ArrayList<Human> that contains either the father or mother object, but not the same as the first set of grandparents (4 people cannot parent one person). The father and mother object's children field should both return an ArrayList<Human> that contains the three children objects. The three children's children field should be empty. Instead of creating ArrayLists in the main method like you did here,

ArrayList<Human> children = new ArrayList<Human>();
       ArrayList<Human> old = new ArrayList<Human>();

I would take ArrayList children out of the constructor for the Human class

public Human(String name, Boolean sex, int age, ArrayList children){
            this.name = name;
            this.sex = sex;
            this.age = age;
            this.children = children;
        }

Initialize all your Human objects with just a name, sex and age. Then you can add the corresponding children to the Human class' children field like so

grandFathe1.children.add(mother);
grandMother1.children.add(mother);

That should do the trick, I hope this helped.

marwan

Level 22 , Oman

28 December 2019, 10:30

It's work now. I did what you said and it's work. Thanx

Thomas Sixberry

Level 16 , Rochester Hills, United States

5 February 2020, 16:31

grandFathe1.children.add(mother);
grandMother1.children.add(mother);

Does that not mean they would be the children of the mother?

Isaiah Burkes

Level 16 , Tampa, United States

12 February 2020, 19:54

Every Human object has an ArrayList (that contains objects of type Human) called children. Those two lines will add the mother object to the grandFathe1 and grandMother1's ArrayList. So no they won't be the children of the mother. The mother will be their children.