多态

class Animal{}public class Dog extends Animal{public static void main(String args[]){Animal animal = new Dog();if(animal instanceof Animal){System.out.println("isAnimal");}if(animal instanceof Dog){System.out.println("isDog");}System.out.println(animal.getClass());//Animal b;//System.out.println(b.getClass());}}

输出

isAnimal
isDog
class Dog