Java——关键字instanceof

instanceof 判断一个对象是否为一个类的实例，是为true ，否为false

class Animal{}
class Cat extends Animal{}
/**instanceof 判断一个对象是否为一个类的实例*/
public class InstanceofTest {

    public static void main(String[] args) {
        System.out.println(null instanceof Animal);//false
        System.out.println(null instanceof Cat);//false

        System.out.println(new Cat() instanceof Animal);//true
        System.out.println(new Cat() instanceof Cat);//true

        System.out.println(new Animal() instanceof Animal);//true
        System.out.println(new Animal() instanceof Cat);//false
    }
}