Как ни стараюсь 5 и 6 строка не решаются. В чем дело подскажите пожалуйста
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 grandFatherName=reader.readLine();
Cat catGrandFather=new Cat(grandFatherName);
String grandMotherName=reader.readLine();
Cat catGrandMother=new Cat(grandMotherName);
String FatherName=reader.readLine();
Cat catFather=new Cat(FatherName,null,catGrandFather);
String MotherName=reader.readLine();
Cat catMother=new Cat(MotherName,catGrandMother,null);
String daughterName = reader.readLine();
Cat catDaughter = new Cat(daughterName, catMother,catFather);
String sonName=reader.readLine();
Cat catSon=new Cat(sonName, catMother, catFather);
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 parentF;
private Cat parentM;
Cat(String name) {
this.name = name;
}
Cat(String name, Cat parentM,Cat parentF) {
this.name = name;
this.parentM = parentM;
this.parentF = parentF;
}
@Override
public String toString() {
if (parentF == null && parentM == null)
return "The cat's name is " + name + ", no mother, no father ";
else if (parentM == null )
return "The cat's name is " + name + ", no mother, father is "+parentF.name;
else if (parentF == null)
return "The cat's name is " + name + ", mother is " + parentM.name+", no father";
else
return "The cat's name is " + name + ", mother is " + parentM.name+", father is" + parentF.name;
}
}
}