多态性的使用举例

package com.day0125_3;
//多态性的使用举例:
public class AnimalTest {
  public static void main(String[] args) {
    AnimalTest test=new AnimalTest ();
    test.func(new Dog());
    test.func(new Cat());
  }
  public void func(Animal animal) {//Animal animal=new Dog();
    animal.eat();
    animal.shout();
  }
  //如果没有多态性
//  public void func(Dog dog) {
//    dog.eat();
//    dog.shout();
//  }
//  
//  public void func(Cat cat) {
//    cat.eat();
//    cat.shout();
//  }
}
class Animal{
  public void eat() {
    System.out.println("动物：进食");
  }
  public void shout() {
    System.out.println("动物：叫");
  }
}
class Dog extends Animal{
  public void eat() {
    System.out.println("狗吃骨头");
  }
  public void shout() {
    System.out.println("汪！汪!汪!");
  }
}
class Cat extends Animal{
  public void eat() {
    System.out.println("猫吃鱼");
  }
  public void shout() {
    System.out.println("喵！喵!喵!");
  }
}