多態實現主人喂養寵物

/*
多態實現主人喂養寵物
 */
package day_7;

public class Pet {
    public void eat(){
        System.out.println("***********寵物在吃**********");
    }
}
package day_7;

public class Dog extends Pet {
    public void eat(){
        System.out.println("**********狗在吃骨頭**********");
    }
}
package day_7;

public class Cat extends Pet {
    public void eat(){
        System.out.println("**********貓在吃魚**********");
    }
}
package day_7;

public class Bird extends Pet {
    public void eat(){
        System.out.println("**********鳥在吃蟲子**********");
    }
}
package day_7;

public class Master {
    public void feed(Pet pet){   //----->（形參：父類  =  實參：子類）----->實現多態
        pet.eat();   //優先調用子類重寫方法
    }
}
package day_7;
public class test {
    public static void main(String[] args) {
        Dog dog=new Dog();
        Cat cat=new Cat();
        Bird bird=new Bird();
        Master master=new Master();
        master.feed(dog);
        master.feed(cat);
        master.feed(bird);
    }
}