java多态

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public abstract class Food {
public abstract String getName();
}

public class Bone extends Food {
public String getName() {
return "Bone";
}
}

public class Fish extends Food {
public String getName() {
return "Fish";
}
}

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public abstract class Animal {
abstract void eat(Food food);
}

public class Dog extends Animal {
@Override
void eat(Food food) {
  if (food instanceof Bone) {
   System.out.println("Dog eat Bone");
  } else {
   System.out.println("Dog don't eat " + food.getName());
  }
}
}

public class Cat extends Animal {
@Override
void eat(Food food) {
  if (food instanceof Fish) {
   System.out.println("Cat eat Fish");
  } else {
   System.out.println("Cat don't eat " + food.getName());
  }
}
}

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public class Feeder {
void feed(Animal animal, Food food) {
  animal.eat(food);
}
public static void main(String[] args) {
  Feeder feeder = new Feeder();
  Animal animal = new Dog();
  feeder.feed(animal, food);
}
}