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Main.java
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import java.util.*;

class Main {
  public static void main(String[] args) {
    List<Animal> animals = new LinkedList<Animal>();

    animals.add(new Animal());
    animals.add(new Wolf());
    animals.add(new Fish());
    animals.add(new Goldfish());
    animals.add(new OtherAnimal());

    for (Animal animal : animals) {
      animal.eat();
    }
  }
}