Java 的一个关于接口和继承方面的基础问题的疑惑，往大佬解答。

Question

先看下我的代码

动物抽象类

abstract class Animal {
    public abstract void drink();
    public abstract void move(String destination);

}

哺乳动物抽象类继承动物类

abstract class Mammal extends Animal{
    //
```哺乳动物类

}

爬行动物类

abstract class Reptitel extends Animal {//爬行动物类

}

老虎类

public class Tiger extends Mammal implements Hunt{
    String name = "Tiger";
     public void move(String destination){
         System.out.println("Tiger move  to "+destination+".");
     }

     public void drink(){
         System.out.println("Tiger have drunk.");
     }

     public void hunt(Animal animal){
        System.out.println("Tiger has eaten "+animal);
     }

     public String getName() {
        return name;
     }

}

蛇类

public class Snake extends Reptitel implements Hunt{
    String name = "Snake";

    public void move(String destination){
        System.out.println("Snake move  to "+destination+".");
    }

    public void drink(){
        System.out.println("Snake have drunk.");
    }

    public void hunt (Animal animal){
        System.out.println("Snake has eaten "+animal);
    }

    public String getName() {
        return name;
    }
}

兔子类

public class Rabit extends Mammal {
    String name = "Rabit";
    public void move(String destination){
        System.out.println("Rabit move  to "+destination+".");
    }

    public void drink(){
        System.out.println("Rabit have drunk.");
    }

    public String getName() {
        return name;
    }
}

Hunt接口

interface Hunt extends Animal{
    public void hunt(Animal animal);
}

农夫类

public class Famer {
    String name = "famer";

    public void bringWater(String destination){
        System.out.println("Famer bring a bottel of watter to "+destination);
    }

    public void feedWater(Animal animal,String destination){

        this.bringWater(destination);
        animal.move(destination);
        animal.drink();
        System.out.println(animal+" has been fed by famer\n");

    }

    public void feedWaterThreePlaces(){
        Animal tiger = new Tiger();
        Animal snake = new Snake();
        Animal rabit = new Rabit();
        Famer famer = new Famer();

        famer.feedWater(tiger ,"room");
        famer.feedWater(snake,"livingroom");
        famer.feedWater(rabit,"river");

    }

    public void bringAnimal(Animal animal,String destination){

                System.out.println("Famer brings "+animal+" to "+destination);

     }

//这个feedAnimal我写不出来，希望大佬解答。
//我想同这个方法完成农夫给肉食性动物喂食
//1.农夫将食物带到进食房间
//2.食肉性动物移动到进食房间
//3.肉食性动物用hunt方法完成进食
    public void feedAnimal(Animal food,Animal hunter){

        this.bringAnimal(food,"feeding room");
                hunter.move("feeding room");
                //以下是我遇到的难题，我的hunter无法调用hunt方法，我觉得可能是
                //因为animal中有tiger rabit snake但是只有tiger和snake拥有hunt方法
                //所以hunter不能调用hunt方法
                hunter.hunt(food);   //这行代码被报错

    }


 }

Test以上方法

public class Run {
    public static void main(String[] args) {
        //用于执行famer的喂食方法测试
    }
}

Answer 1

Animal 这个抽象类并没有 hunt的方法，所以你这么写肯定要报错。你应该在抽象类中定义这个hunt方法，但是兔子和老虎你都继承于Mammal，在Mammal中定义hunt就不太合理，因为兔子不能hunt，你这个设计有点问题。