编写一个抽象类animal

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public abstract class Animal {
    public abstract void shout();
}

public interface Pet {
    public void play();
}

public class Dog extends Animal implements Pet{
    @Override
    public void shout() {
        System.out.println("bark bark");
    }

    @Override
    public void play() {
        System.out.println("play play");
    }
}

public class Main {
    public static void main(String[] args) {
        Dog dog=new Dog();
        dog.play();
        dog.shout();
    }
}