Java - is `null` an instance of `object`?

Question

I read that null isn\'t an instanceof anything, but on the other hand that everything in Java extends Object class.

Answer 1

Null means that you don't have a reference to an object.

Object o = null;

o is a reference but there is no object referenced and no memory allocated for it.

o = new Object();

o is still a reference and holds the adress where the object is located in memory