Home/ Questions/Q 7078711
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-28T06:34:52+00:00

I made a vector set in order to avoid thrashing the GC with iterator

  • 0

I made a vector set in order to avoid thrashing the GC with iterator allocations and the like
( you get a new/free each for both the set reference and the set iterator for each traversal of a HashSet’s values or keys )

anyway supposedly the Object.hashCode() method is a unique id per object. (would fail for a 64 bit version?)

But in any case it is overridable and therefore not guaranteed unique, nor unique per object instance.

If I want to create an “ObjectSet” how do I get a guaranteed unique ID for each instance of an object??

I just found this: which answers it.

How to get the unique ID of an object which overrides hashCode()?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    java.lang.System.identityHashCode(obj); will do this for you, if you really need it and understand the repercussions. It gets the identity hashcode, even if the method to provide the hashcode has been overridden.

    • 0