New issue: String cannot be converted

Question about the task

Resolved

"com/codegym/task/task06/task0621/Solution.java:23: error: incompatible types: java.lang.String cannot be converted to com.codegym.task.task06.task0621.Solution.Cat Cat cat4 = new Cat(catName4, catName2, null);" I got rid of the "missing return statement issue" (I think), but now I see what's quoted above. Again, any help will be greatly appreciated!

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 catName = reader.readLine(); //grandpa Cat cat = new Cat(catName, null, null); String catName2 = reader.readLine(); //grandma Cat cat2 = new Cat(catName, null, null); String catName3 = reader.readLine(); // father Cat cat3 = new Cat(catName, null, cat); String catName4 = reader.readLine(); //mother Cat cat4 = new Cat(catName, cat2, null); String catName5 = reader.readLine(); //son Cat cat5 = new Cat(catName, cat4, cat3); String catName6 = reader.readLine(); //daughter Cat cat6 = new Cat(catName, cat4, cat3); System.out.println(cat.toString()); System.out.println(cat2.toString()); System.out.println(cat3.toString()); System.out.println(cat4.toString()); System.out.println(cat5.toString()); System.out.println(cat6.toString()); } public static class Cat { private String name; private Cat mother; private Cat father; Cat(String name, Cat mother, Cat father) { this.name = name; this.mother = mother; this.father = father; } @Override public String toString() { if (this.mother == null && this.father == null) { return "The cat's name is " + name + ", no mother, no father"; } if (this.mother != null && this.father == null) { return "The cat's name is " + name + ", " + mother.name + " is the mother, no father"; } if (this.father != null && this.mother == null) { return "The cat's name is " + name + ", no mother " + father.name + " is the father"; } if (this.father != null && this.mother != null) { return "The cat's name is " + name + ", " + mother.name + " is the mother, " + father.name + " is the father"; } } } }

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Guadalupe Gagnon

Level 37 , Tampa, United States

14 June 2021, 15:22

You must understand that a computer can not think at all, not in the least. Even single cell organisms without a brain are more capable of making their own decisions than computers are. You have to realize this, in every possible scenario, when coding that you have to be VERY specific in what you want the computer to do as it will not be able to figure it out on its own. When a method has a return value specified it MUST reach a return statement. I can look at your code and clearly see that your if statements include all possible scenarios of parents and a return statement will be reached; but it is a common mistake, as a new programmer, to assume that the computer can figure this out. The computer looks at that code, in the toString() method, and sees no return statements because they are all behind logic gates. Because there are literally infinite amount of possible scenarios that you can encode the computer can't be set up to test the code that you write beyond basic things. So it does not matter that there is no scenario where all of those statements are false, the computer needs to find at least one return statement not behind a logic gate.

Yomi Addey

Level 8 , Baltimore, United States

14 June 2021, 15:25

Thank you for this reminder!