親から"犬"という種族名を受け継ぐはずが「敷かれたレールは嫌だから」という理由で継がなかったため、世間から"動物"と呼ばれるようになった動物

Dog.java

package social;

import java.util.Random;

enum Sex {
  MALE, FEMALE
}

class God {
  private final static Random random = new Random();
  private static Sex decideSex() {
    Sex[] sexes = Sex.values();
    return sexes[random.nextInt(sexes.length)];
  }
}

abstract class Animal {
  abstract Sex getSex();
  abstract Animal makeChildren(Animal partner);
  abstract String getCallName();
}

class Dog extends Animal {
  private Sex sex;
  private boolean hateSocialRails = false;
  protected Dog(Sex sex) {
    this.sex = sex;
  }
  protected Sex getSex(){
    return this.sex;
  }
  protected Animal makeChidren(Animal partner) {
    if(partner == null) return null;
    return new Dog(God.decideSex());
  }
  protected String getCallName() {
    return isHateSocialRails() ? "動物" : "犬";
  }
  protected void setHateSocialRails(boolean hateSocialRails) {
    this.hateSocialRails = hateSocialRails;
  }
  private boolean isHateSocialRails(){
    return isHateSocialRails;
  }
}

public class Main {
  public static void main(String[] args){
    final Dog fatherDog = new Dog(Sex.MALE);
    final Dog motherDog = new Dog(Sex.FAMLE);
    final Dog chidrenDog = motherDog.makeChidren(fatherDog);
    chidrenDog.setHateRails(true);
    System.out.print(chidrenDog.getCallName());
  }
}