Hi Coders!

Question about the task

Resolved

1. What's @Override ? 2. What's my code wrong 😞?

Task: Each cat has a name and a mother.
Create a class that describes this situation.
Create two objects: a daughter cat and a mother.
Display them on the screen.

New task: Each cat has a name, a father, and a mother.
Edit Cat so that it reflects these relationships.
Create 6 objects: grandfather (the father's father), grandmother (the mother's mother), father, mother, son, daughter.
Display them all in the following order: grandfather, grandmother, father, mother, son, daughter.

Example input:
Grandfather Tiger Grandmother Puss Father Oscar Mother Missy Son Simba Daughter Coco

Example output:
The cat's name is Grandfather Tiger, no mother, no father The cat's name is Grandmother Puss, no mother, no father The cat's name is Father Oscar, no mother, Grandfather Tiger is the father The cat's name is Mother Missy, Grandmother Puss is the mother, no father The cat's name is Son Simba, Mother Missy is the mother, Father Oscar is the father The cat's name is Daughter Coco, Mother Missy is the mother, Father Oscar is the father

Requirements:

The program should read in the names of 6 cats in the specified order.
The main method should create 6 Cat objects.
The program should display 6 lines with information about the cats.
The line about the grandfather (first line) must match the conditions.
The line about the grandmother (second line) must match the conditions.
The line about the father (third line) must match the conditions.
The line about the mother (fourth line) must match the conditions.
The line about the son (fifth line) must match the conditions.
The line about the daughter (sixth line) must match the conditions.

package com.codegym.task.task06.task0621; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /* Cat relations */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String grandfatherName = reader.readLine(); Cat catGrandFather = new Cat(grandfatherName,null ,null); String grandmotherName = reader.readLine(); Cat catGrandMother = new Cat(grandmotherName,null ,null); String fatherName = reader.readLine(); Cat catFather = new Cat(fatherName,null ,grandfatherName); String motherName = reader.readLine(); Cat catMother = new Cat(motherName, grandmotherName,null); String sonName = reader.readLine(); Cat catSon = new Cat(sonName,fatherName,motherCat); String daughterName = reader.readLine(); Cat catDaughter = new Cat(daughterName,fatherName,motherName); System.out.println(catGrandFather); System.out.println(catGrandMother); System.out.println(catFather); System.out.println(catMother); System.out.println(catSon); System.out.println(catDaughter); } public static class Cat { private String name; private Cat father; private Cat mother; Cat(String name) { this.name = name; } Cat(String name, Cat father, Cat mother) { this.name = name ; this.father = father ; this.mother = mother ; } @Override public String toString() { if ((mother == null) && (father == null)) return "The cat's name is " + name + ", no mother & no father " ; else if (father == null) return "The cat's name is " + name + ", no father "; else if (mother == null) return "The cat's name is " + name + ", no mother "; else return "The cat's name is " + name + ", " + father.name + " is the father" + ", & " + mother.name + " is the mother" ; } } }

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Guanting Liu

Level 0 , Springfield, United States

Expert

26 November 2020, 05:06

Your problem is what u call like Misiu said from constructors are not able to match what u "construct" in your class Cat.You have a constructor Cat(String , Cat , Cat) which I defined their required types which u need to fill in your new object.then take a look at how u create cat object.I think there are a lot of errors in your codes but they should be the same things.Just an example on your line 32,u should know all your names are strings from IOstream and they are not "Cat" objects.So if u write (String, xxxname,xxxname)That's absolutely wrong because the method is (String,String,String) type which u can definitely see it's not the same with what u create in your Cat class.

Misiu

Level 41 , Gdansk, Poland

25 November 2020, 12:36

1. @Override means: there is such a method in upper (base) class(es). But here you created and want to use your own one. This word is for programmers, not for compiler. 2. Constructor for grandparents is in line 47, has one parameter. 3. Constructor in line 47 has 3 parameters in order: name, father, mother. Father and mother are cats, not names.

Шарох

Level 10

25 November 2020, 12:57

Hi Misiu ! I repaired constructor. but it says me line 23 is incorrect too.

Misiu

Level 41 , Gdansk, Poland

25 November 2020, 13:09

See my point 3. Father has: - name, - grandfather, (cat, object, not name) - no grandmother. I repaired constructor. ??? Where? How?

Шарох

Level 10

26 November 2020, 09:02

1. Its my constructor : Cat(String name, Cat father,Cat mother) { this.name = name ; this.father = father ; this.mother = mother ; } 2.Its my cat arguments : ( variableName,variableName,variableName) Now it says cant match lines with conditions.

Misiu

Level 41 , Gdansk, Poland

26 November 2020, 12:51

Constructor is OK. Now put in it: Cat(name of the father, father's grandfather (cat object, not name), null (no mother)) ^ catGrandFather

Шарох

Level 10

27 November 2020, 08:42

Thank you Misiu !