I can't understand what is wrong

Question about the task

Family census

Java Syntax, Level 7, Lesson 12

Resolved

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 ena = new Human("Niko",male, 66); Human dyo = new Human("Eirhni", female, 66); Human tria = new Human("Odysseas", male, 43); Human tessera = new Human("Nina", female,37); Human pente = new Human("Ilias", male, 33, ena, dyo); Human eksi = new Human("Theodoris", male, 31, ena, dyo); Human epta = new Human("Aristotelis", male,29,ena,dyo); Human okto = new Human ("Dimitri", male, 14, tria, tessera); Human ennea = new Human ("Sophia", female, 12, tria, tessera); } public static class Human { // write your code here String name; boolean sex; int age; Human father; Human mother; public Human (String name, boolean sex, int age){ this.name = name; this.sex = sex; this.age = 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; } ena.toString(); dyo.toString(); tria.toString(); tessera.toString(); pente.toString(); eksi.toString(); epta.toString(); okto.toString(); ennea.toString(); 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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Gellert Varga

Level 23 , Szekesfehervar, Hungary

25 June 2020, 16:12

solution

1) From line 46 to line 54: You don't need these codes. I don't understand what was your purpose with them. 2) Line 27: in the Human class, the instance variable 'sex' is a boolean type. It can have only two value: 'true' or 'false'. In the constructors of the Human class the second argument are also the same boolean type 'sex' variable. So, when You create a Human-object (from line 11 to 19) you may not send 'male' and 'female' words as the second argument to the constructor, but only the 'true' or 'false'. 3) After these corrections, your program will work well. Do a test: Write for example this code in your main() method:

System.out.println(okto);

and watch the output!

algO

Level 18 , Athens, Greece

26 June 2020, 08:58

thanks a lot

Thomas

Level 41 , Bayreuth, Germany

25 June 2020, 16:05

line 46 - 54 belong into your main. You should consider to save the results of these method calls into a varible or give them directly to a System.out.println() call like... System.out.println(ena.toString()); Then you can continue testing your code.