小编Joh*_*des的帖子

我一直在尝试使用泛型和多态.我遇到了一个我无法理解的问题.

说我有

public abstract class Animal {
    private age;
    private weight;

    public Animal(){}

    public void Move(){
        //stuff
    }

    public void Eat(){
        //stuff
    }

    //Getters and setters
}

然后

public Cat extends Animal {
    //Constructors
}

public Snake extends Animal {
    //Constructors
    public void ShedSkin(){
        //stuff
    }
}

我也有自己的班级"MyAbstractClass".就在这里,我似乎无法解决问题.

public abstract class MyAbstractClass {
    private List<Animal> myAnimalList;

    public MyAbstractClass(){}

    public MyAbstractClass(List<? extends Animal> animalList) {
        this.myAnimalList = animalList;
    }

    public List<Animal> getAnimalList() {
        return myAnimalList;
    }

    //Stuff which DOES NOT add …