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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) { Human h1 = new Human("s", true, 1); Human h2 = new Human("s", true, 1); Human h3 = new Human("s", true, 1); Human h4 = new Human("s", true, 1); Human h5 = new Human("s", true, 1, grandfather2, grandmother2); Human h6 = new Human("s", true, 1, grandfather1, grandmother1); Human h7 = new Human("s", true, 1, father, mother); Human h8 = new Human("s", true, 1, father, mother); Human h9 = new Human("s", true, 1, father, mother); System.out.println(h1); } public static class Human { String name; Human father; Human mother; boolean sex; int age; public 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 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; if (this.father != null) text += ", father: " + this.father.name; if (this.mother != null) text += ", mother: " + this.mother.name; return text; } } }

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J H U X

Level 7 , Alkmaar, Netherlands

14 February 2021, 10:23

You're referring to grandfather2 and grandmother2 etc, when you're creating h5, but you have named them h1 and h2 before instead? And then you only print h1. These are the errors imo. You should instead write: Human h5 = new Human("s", true, 1, h1, h2); OR: Human grandfather2 = new Human("s", true, 1); and THEN continue with what you wrote earlier. To keep it readable and debuggable, you should name your variables more meaningful. Then, in the end, print all variables, not just h1.

Vincenzo Seggio

Level 28

19 September 2020, 07:33

Moin, try to make father and mother in line 25/26 static. Then call in the parameter - brackets in main "Human.father", "Human.mother"

Vincenzo Seggio

Level 28

19 September 2020, 07:41

Sorry, this was wrong. Human h5 = new Human("s", true, 1, grandfather2, grandmother2); Instead of calling e.g. gradfather2 you must create a new instance of Human eg. new Human("Heinz", true, 55)