您需要向该类添加类型变量：
public abstract class Animal<F extends AnimalFeed> { public abstract void eat(F somethingToEat);}然后，您可以将子类声明为需要特定类型的
AnimalFeed：
public class Bird extends Animal<BirdFeed> { public void eat(BirdFeed somethingToEat) {}}public class Fish extends Animal<FishFeed> { public void eat(FishFeed somethingToEat) {}}
