задача и решение в целом ясны
но что делает эта строка абсолютно непонятно
@Override
public String toString()package com.javarush.task.task06.task0621;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
/*
Родственные связи кошек
*/
public class Solution {
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String grandpa =reader.readLine();
Cat catGrandpa = new Cat(grandpa,null,null);
String grandma = reader.readLine();
Cat catGrandma = new Cat(grandma,null,null);
String father = reader.readLine();
Cat catFather = new Cat(father, catGrandpa,null);
String mother = reader.readLine();
Cat catMother = new Cat(mother, catGrandma,null);
String son = reader.readLine();
Cat catSon = new Cat(son, catFather,catMother);
String daughter = reader.readLine();
Cat catDaughter = new Cat(daughter, catFather, catMother);
System.out.println(catGrandpa);
System.out.println(catGrandma);
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 parent;
private Cat parent2;
Cat(String name) {
this.name = name;
}
Cat(String name, Cat parent) {
this.name = name;
this.parent = parent;
}
Cat(String name, Cat parent, Cat parent2) {
this.name = name;
this.parent = parent;
this.parent2 = parent2;
}
@Override
public String toString() {
if (parent == null)
return "The cat's name is " + name + ", no mother ";
else
return "The cat's name is " + name + ", mother is " + parent.name;
}
}
}