如何调用超类的重写方法？ [英] How to call the overridden method of a superclass?

问题描述

如何在代码中使用 myAnimal 实例调用 Animal 类的吃喝方法？

How can I call the eat and drink method of the Animal class with the myAnimal instance in the code?

public class Animal {
    public void eat() {
        System.out.println("Animal Eats");
    }

    public void drink() {
        System.out.println("Animal Drinks");
    }
}

---

---

public class Cat extends Animal {
    @Override
    public void eat() {
        System.out.println("Cat Eats");
    }

    @Override
    public void drink() {
        System.out.println("Cat Drinks");
    }

    public static void main(String[] args) {
        Cat myCat = new Cat();
        myCat.eat();
        myCat.drink();

        Animal myAnimal = myCat;        
        myAnimal.eat();
        myAnimal.drink();
    }
}

我得到的输出：

Cat Eats
Cat Drinks
Cat Eats
Cat Drinks

这是我的预期输出：

Cat Eats
Cat Drinks
Animal Eats
Animal Drinks

推荐答案

你无法做你想做的事。多态性的工作方式是做你所看到的。

You cannot do what you want. The way polymorphism works is by doing what you are seeing.

基本上猫总是知道它是一只猫而且总是表现得像一只猫，无论你是否像对待一样猫，猫科动物，猫科动物，猫科动物，猫科动物，食肉目，咏叹调，哺乳动物，脊椎动物，脊索动物，Eumetazoa，动物，动物，物体或其他任何东西： - ）

Basically a cat always knows it is a cat and will always behave like a cat regardless of if you treat is as a Cat, Felis, Felinae, Felidae, Feliformia, Carnivora, Theria, Mammalia, Vertebrata, Chordata, Eumetazoa, Animalia, Animal, Object, or anything else :-)

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