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Question about the task

Family census

Java Syntax, Level 7, Lesson 12

Under discussion

help me to resolve it, please

Create the Human class with String name, boolean sex, int age, Human father, and Human mother fields. Create and populate objects so that we end up with: Two grandfathers, two grandmothers, one father, one mother, and three children. Display the objects on the screen.

Note:
If you write your own String toString() method in the Human class, then it will be used to display the object on the screen.

Example output:
Name: Anna, sex: female, age: 21, father: Paul, mother: Kate Name: Kate, sex: female, age: 55 Name: Ben, sex: male, age: 2, father: Michael, mother: Anna …

Requirements:

The program must not read data from the keyboard.
Add the following fields to the Human class: String name, boolean sex, int age, Human father, and Human mother.
Add a constructor: public Human(String name, boolean sex, int age).
Add a constructor: public Human(String name, boolean sex, int age, Human father, Human mother).
Create 9 different Human objects (4 objects without a father and mother and 5 objects with them).
Display all the created objects on the screen.

package com.codegym.task.task07.task0724; /* Family census */ public class Solution { public static void main(String[] args) { // write your code here Human Papa = new Human("papa",true,50); Human Mummy = new Human("mummy",false,50); Human h1 = new Human("Pragati",false, 22); Human h2 = new Human("Pragati1",false, 21); Human h3 = new Human("Pragati2",false, 23); Human h4 = new Human("Pragati3",false, 24); Human h5 = new Human("Pragati4",false, 25,Papa,Mummy); Human h6 = new Human("Pragati5",false, 26,Papa,Mummy); Human h7 = new Human("Pragati6",false, 27,Papa,Mummy); Human h8 = new Human("Pragati7",false, 28,Papa,Mummy); Human h9 = new Human("Pragati8",false, 29,Papa,Mummy); System.out.println(h1); System.out.println(h2); System.out.println(h3); System.out.println(h4); System.out.println(h5.toString()); System.out.println(h6.toString()); System.out.println(h7.toString()); System.out.println(h8.toString()); System.out.println(h9.toString()); } public static class Human { // write your code here String name; boolean sex; int age; static Human father; static Human mother; Human(String name, boolean sex, int age) { this.name=name; this.sex=sex; this.age=age; } Human(String name, boolean sex, int age, Human father, Human mother) { this.name=name; this.sex=sex; this.age=age; this.father=father; this.mother=mother; } public String toString() { String text = ""; text += "Name: " + this.name; text += ", sex: " + (this.sex ? "male" : "female"); text += ", age: " + this.age; if (this.father != null) text += ", father: " + this.father.name; if (this.mother != null) text += ", mother: " + this.mother.name; return text; } } }

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Sela

Level 20 , Poland

26 June 2020, 11:25

if removing static keyword did not help to pass the test as Guadalupe suggested then the number of object created might be the culprit. although 9 objects are printed there are 11 created in your code. two of the 9 should be passed as a parameter to five of them.

yz Backend Developer

7 November 2019, 05:20

when u try to print object the "toString ();" method will auto called dont use tostring

Vidhya

Level 16 , Sunnyvale, United States

6 November 2019, 00:19

Your need to create 2 grandfathers objects 2 grand mothers objects and 1 father and 1 mother and 3 children So ideally the father will have a set of parents and so is the mother.

Fuzzy_Melon

Level 9 , United States

28 May 2020, 22:14

I actually read it as 4 objects without parents and 5 objects with parents. I passed following those requirements. The code above should work without the first 2 Pragati objects and of course the previous suggestion of removing toString() from the print lines.

Vidhya

Level 16 , Sunnyvale, United States

1 June 2020, 23:32

Basically there is a logical point to it . Imagine there is a family with mother , father, 3 children. mother will have a set of parents and so is the father (4 set of grandparents) . So when we create the grandparents we create as Human grandmother = new Human("Pragati",true, 62); (Boolean is for male or female) when we do the same for the parents then it becomes Human mother = new Human("Pragiti", true, 40,grandmother) . this is how you build

Guadalupe Gagnon

Level 37 , Tampa, United States

5 November 2019, 15:48

static Human father; static Human mother; You will need to remove the static keyword from the lines 54 and 55. Making these variables static means that they are shared every object of the human class. That means lines 14-22 all have papa and mummy as their parents, even though you do not set them for h1-h4.