interface AbleToEat(){
   public void eat();
}

class Animal implements AbleToEat(){

@Override
public void eat(){
sout("Animal is eating");
 }
}

public class Test{
  psvm{
      AbleToEat ableToEat = new Animal();
      ableTOEat.eat();
 }
}

class Dog implements AbleToEat() {
    @Override
    public void eat() {
        sout("Dog is eating");
    }
}
class Snake implements AbleToEat() {
    @Override
    public void eat() {
        sout("Mmmm rabit is tasty!");
    }
}
class Test {
    ArrayList<AbleToEat> whoIsEat = new ArrayList<>();
    whoIsEat.add(new Dog());
    whoIsEat.add(new Snake());
    for (AbleToEat something : whoIsEat) {
        something.eat();
    }
}