Java第五课：动物声音"模拟器"

public abstract class Animal{
abstract void cry();
abstract String getAnimalName();
}

class Cat extends Animal{
void cry(){
System.out.println("喵");
}
String getAnimalName(){
return "猫";
}
}

class Dog extends Animal{
void cry(){
System.out.println("汪");
}
String getAnimalName(){
return "狗";
}
}

class Simulator{
Animal a;
void playSound(Animal animal){
a = animal;
System.out.print(a.getAnimalName()+"叫:");
a.cry();
}
}

public class Application{
public static void main(String args[]){
Dog dog = new Dog();Cat cat = new Cat();
Simulator simulator = new Simulator();
simulator.playSound(dog);
simulator.playSound(cat);
}
}