can someone help , please
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 fatherName = reader.readLine();
Cat catFather = new Cat(fatherName) ;
String grandfatherName = reader.readLine();
Cat catGranfather = new Cat(grandfatherName, catFather);
String motherName = reader.readLine();
Cat catMother = new Cat(motherName );
String daughterName = reader.readLine();
Cat catDaughter = new Cat(daughterName , catMother );
String grandmotherName = reader.readLine();
Cat catGrandmother = new Cat(grandmotherName , catMother ) ;
String sonName = reader.readLine() ;
Cat catSon = new Cat(sonName , catFather ) ;
System.out.println(catGranfather);
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 mother;
private Cat father;
Cat(String name) {
this.name = name;
}
Cat (String name , Cat mother) {
this.name =name ;
this.mother = mother ;
this.father = father ;
}
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 ( mother == null)
return "The cat's name is " + name + ", no mother" + father.name + ", is the father";
else if (mother != null )
return "The cat's name is " + name + ", " + mother.name + " is the mother, no father ";
else if (father != null && mother != null )
return "The cat's name is " + name + ", " + mother.name + " is the mother, " + father.name + " is the father";
else return null ;
}
}
}