Не принимает null в описании родителей
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 gfatherName = reader.readLine();
Cat catGfather = new Cat(gfatherName);
String gmotherName = reader.readLine();
Cat catGmother = new Cat(gmotherName);
String fatherName = reader.readLine();
Cat catFather = new Cat(fatherName, null, catGfather);
String motherName = reader.readLine();
Cat catMother = new Cat(motherName, catGmother, null);
String sonName = reader.readLine();
Cat catSon = new Cat(sonName, catMother, catFather);
String daughterName = reader.readLine();
Cat catDaughter = new Cat(daughterName, catMother, catFather);
System.out.println(catGfather);
System.out.println(catGmother);
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 & parent2 == null)
return "The cat's name is " + name + ", no mother"+", no father";
else if (parent2 == null)
return "The cat's name is " + name + ", no mother, father is " + parent.name;
else if (parent == null)
return "The cat's name is " + name + ", mother is " + parent.name + ", no father";
else
return "The cat's name is " + name + ", mother is " + parent.name + ", father is " + parent2.name;
}
}
}