Application.java

  abstract class Animal{
    public abstract void cry();
    public abstract String getAnimalName();
}
class Simulator{
    void playSound(Animal animal){
        animal.cry();
        System.out.println(animal.getAnimalName());
    }
}
class Dog extends Animal{
    public void cry(){
        System.out.println("汪汪汪");
    }
    public String getAnimalName(){
        return "Dog";
    }
}
class Cat extends Animal{
    public void cry(){
        System.out.println("喵喵喵");
    }
    public String getAnimalName(){
        return "Cat";
    }
}
public class Application{
    public static void main(String[] arg){
        Simulator simulator=new Simulator();
        simulator.playSound(new Dog());
        simulator.playSound(new Cat());
    }
}