memory allocation for upcasting in java

Question

Considering these classes:

public class Animal{

}

public class Dog extends Animal{

}

public AnimalTest(){
    public static void main(String[] args){
       Dog d = new Dog();
       Animal a = d;
   }
}

my question is since I performed an upcasting on Animal a = d;does it consume a new memory allocation on the machine or does it use the memory allocated to the Dog d = new Dog();

Answer 1

The Actual object or its memory footprint is not affected. just a new reference to the object is created. The only difference is that the reference a can only call methods or access attributes that was available in the Super Class Animal.