what is the internal working of System.idendityHashCode() and hashCode() method?

I read About System.identityHashCode(Object x). You can not override it because its static method but i can override Object's hashCode method. and also this is mentioned for System.identityHashCode(Object x) in javadoc as :

Returns the same hash code for the given object as would be returned by the default method hashCode(), whether or not the given object's class overrides hashCode().The hash code for the null reference is zero.

but when i am running below code by swapping the object in println method i am getting same result.

public class SherlockGCD {
    public int hashCode()
      {
       return super.hashCode();
      }
    public static void main(String[] args) {
      SherlockGCD sher= new SherlockGCD();
      SherlockGCD sher1= new SherlockGCD();
      System.out.println(System.identityHashCode(sher));
      System.out.println(sher1.hashCode());
     }
    }

Output is :

31866429

16795905

but if you swap the object as below then also same output

    System.out.println(System.identityHashCode(sher1));
    System.out.println(sher.hashCode());

Output is :

31866429

16795905

so why output is not reversing as i am changing the object in println method??