public class Main {
    public void main(){
        Animal cat = new Cat();
        Animal dago = new Dog();
        cat.makeVoice();
        dago.makeVoice();
        if(cat instanceof Swimmable){
            System.out.println("猫会游泳");
        }
        else{
            System.out.println("猫不会游泳");
        if (dago instanceof Swimmable){
            System.out.println("大狗会游泳");
        }
        else{
            System.out.println("大狗不会游泳");
        }
        }
    }
}