/* 多态实现主人喂养宠物 */ package day_7; public class Pet { public void eat(){ System.out.println("***********宠物在吃**********"); } } package day_7; public class Dog extends Pet { public void eat(){ System.out.println("**********狗在吃骨头**********"); } } package day_7; public class Cat extends Pet { public void eat(){ System.out.println("**********猫在吃鱼**********"); } } package day_7; public class Bird extends Pet { public void eat(){ System.out.println("**********鸟在吃虫子**********"); } } package day_7; public class Master { public void feed(Pet pet){ //----->(形参:父类 = 实参:子类)----->实现多态 pet.eat(); //优先调用子类重写方法 } } 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); } }