用抽象类来模拟动物的叫声

Animal.java

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

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Simulator.java

public class Simulator {
    void PlaySound(Animal animal) {
        // TODO Auto-generated method stub
        animal.cry();
        System.out.println(animal.getAnimalName());
    }
}

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Dog.java

public class Dog extends Animal {

    @Override
    public void cry() {
        // TODO Auto-generated method stub
        System.out.println("汪汪汪！");
    }

    @Override
    public String getAnimalName() {
        // TODO Auto-generated method stub
        return "dog";
    }

}

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Cat.java

public class Cat extends Animal {

    @Override
    public void cry() {
        // TODO Auto-generated method stub
        System.out.println("喵喵喵！");
    }

    @Override
    public String getAnimalName() {
        // TODO Auto-generated method stub
        return "car";
    }

}

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Application.java

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

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运行结果：

汪汪汪！
dog
喵喵喵！
car