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Question about the task

Make a family

Java Syntax, Level 8, Lesson 11

Under discussion

i don't what is wrong with it

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.util.*; /* Make a family */ public class Solution { public static void main(String[] args) { ArrayList<Human> children = new ArrayList<>(); Human grandFather = new Human("Odin" , true , 835 ); Human grandFather1 = new Human("bharat" ,true , 90); Human grandMother = new Human("Jyora" , false , 833); Human grandMother1 = new Human("ada" , false ,234); Human Father = new Human("thor" , true , 452 ); Human Mother = new Human("sd" , false , 234 ); Human son = new Human("Tony " , true , 23 ); Human son1 = new Human("Hulk" , true , 23 ); Human son2 = new Human("Steave" , true , 23 ); children.add(son); children.add(son1); children.add(son2); children.add(Father); children.add(Mother); children.add(grandFather); children.add(grandFather1); children.add(grandMother); children.add(grandMother1); System.out.println(grandFather.toString()); System.out.println(grandFather1.toString()); System.out.println(grandMother.toString()); System.out.println(grandFather1.toString()); System.out.println(Father.toString()); System.out.println(Mother.toString()); System.out.println(son.toString()); System.out.println(son1.toString()); System.out.println(son2.toString()); } public static class Human { String name ; boolean sex = true; int age ; ArrayList<Human> children = new ArrayList<>(); public Human(String name , boolean sex , int age) { this.name = name; this.age = age; this.sex = sex; } public Human(String name , boolean sex , int age ,ArrayList<Human> children ) { this.name = name; this.age = age; this.sex = sex; //this.Father = Father; // this.Mother = Mother; 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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Roman Ivanov

Level 25 , Kharkiv, Ukraine

29 December 2018, 10:18

useful

You have not filled the "children" field in any "human" object. Hint: think about how to use second constructor (which is with "children" field initiation) for each "human" object.

hacks patel

Level 20 , Ahmedabad, India

30 December 2018, 06:36

Still can't solve error please give more hint

Roman Ivanov

Level 25 , Kharkiv, Ukraine

30 December 2018, 13:38

well, forget about the second constructor. You can add children for some objects after initialization. Example for mom:

Mother.children.add (son);
Mother.children.add (son1);
Mother.children.add (son2);

Try to understand what this code is doing and do the same for the father and all the grandparents. And remove this:

children.add(son);
children.add(son1);
children.add(son2);
children.add(Father);
children.add(Mother);
children.add(grandFather);
children.add(grandFather1);
children.add(grandMother);
children.add(grandMother1);