java hashCode() function on reference variable and objects

Question

For example, if I create an A type object,

A a = new A();

then a is a reference on the Stack that points to a A type object on the heap. My question is, if I call a.hashCode(), which one's hash code will be returned, the hashcode of the reference or the hashcode of the object? if it is the hashcode of the object, how can i get the hashcode of the reference? Could anyone kindly give me some tips plz?

Oliver Charlesworth · Accepted Answer · 2013-04-09 00:17:04Z

4

hashCode() is just a non-static method, just like any other non-static method. It's either defined by A, or by a base class of A (Object, in the worst case). All that happens is that method gets called on the instance in question.

how can i get the hashcode of the reference?

You can't, because that doesn't make sense.

edited Apr 9, 2013 at 0:17

answered Apr 9, 2013 at 0:09

Oliver Charlesworth

274k34 gold badges591 silver badges687 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jens · Accepted Answer · 2017-08-07 17:34:15Z

2

You can get the hash code of the reference by calling:

System.identityHashCode(a);

This is what data structures such as java.util.IdentityHashMap are based on.

answered Aug 7, 2017 at 17:34

Jens

2151 silver badge7 bronze badges

Collectives™ on Stack Overflow

java hashCode() function on reference variable and objects

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related