'instanceof' demo

class Demo
{
    public static void main(String...args)
    {
        Demo d = new Demo();
        if(d instanceof Object)
            System.out.println("This class is an instance of object, without extending it");
        Object o = d;
        System.out.println("\nfurther, Object 'o' is referring d. Only superclass reference can refer subclass object");
    }
}