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);
}
}
