Hi, I am not too sure whats the problem if anyone could help

Question about the task

Make a family

Java Syntax, Level 8, Lesson 11

Resolved

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 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: 1. The program should display text on the screen. 3. The Human class must have one method. 4. The Solution class must have one method. 5. 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. */ import java.util.ArrayList; public class Solution { public static void main(String[] args) { Human human = new Human("mina",true,33,new Human("nabil"), new Human("nevet"),new Human("kamel"),new Human("anis"), new Human("kamelia"),new Human("victoria"),3); human.children.add(new Human("andrew")); human.children.add(new Human("ramy")); human.children.add(new Human("donna")); System.out.println(human); } public static class Human { private String name; private boolean sex; private int age; ArrayList<Human> children ; private Human grandFather1; private Human grandFather2; private Human grandMother1; private Human grandMother2; private Human father; private Human mother; private int childCount; /*Human(String name,boolean sex, int age){ this.name = name; this.sex = sex; this.age = age; }*/ Human(String name){ this.name = name; } Human(String name,boolean sex, int age, Human father, Human mother, Human grandFather1, Human grandFather2, Human grandMother1, Human grandMother2, int childCount ){ this.name = name; this.sex = sex; this.age = age; this.father = father; this.mother = mother; this.grandFather1 = grandFather1; this.grandFather2 = grandFather2; this.grandMother1 = grandMother1; this.grandMother2 = grandMother2; this.father = father; this.mother = mother; children = new ArrayList<>(childCount); } @Override public String toString() { String text = ""; text += "Name: " + this.name; text += ", sex: " + (this.sex ? "male" : "female"); text += ", age: " + this.age; text += ", grandfather: " + this.grandFather1; text += ", grandfather: " + this.grandFather2; text += ", grandmother: " + this.grandMother1; text += ", grandmother: " + this.grandMother2; text += ", father: " + this.father; text += ", mother: " + this.mother; 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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Nouser

Level 36 , Germany

2 March 2021, 09:12

solution

The Human class should just have the fields mentioned in the requirements and one or two constructors. The constructors depend on how you intend to fill your lists. So your first lines of code are pretty correct.

private String name;
private boolean sex;
private int age;
ArrayList<Human> children;

now I suggest to just add one constructor at first to be able to initialize all fields except the children list

Human(String name, boolean sex, int age) {
     // initialize all the fields with the arguments
}

And you should initialize the children list inside the constructor with an empty list.

children = new ArrayList<>();

Now the rest you do in your main. Create the children, give same names, a age and sex. Then a mothere and father. Again they need age and sex. But they also need their children. These you already have created and you just need to add them to the lists mom and dad have inside their object. eg.

Human child1 = new Human("Child1", true,  5);

Human mom = new Human("Mom", false,  30);
mom.children.add(child1);

Another way would be to have a second constructor that also takes a list. Then in the main you create temporary lists and fill them with the children. in main again:

ArrayList<Human> tempChildren = new ArrayList<>();
tempChildren.add(child1);
Human mom = new Human("Mom", false,  30, tempChildren); // you need to write a constructor for this first

Make sure the setup works, gp1 and gm1 -> eg. mother, gp2 and gm2 -> father, father and mom each -> children 1-3 (The code may not work correctly as I have written it here and haven't verified it. But you should get what they expect