How to get the unique ID of each object in Java?

See the English answer > how to get the unique ID of an object which overrides hashcode()? 9

It should be object anyway The hashcode () method is a unique ID for each object

However, it can be overridden anyway, so it is not guaranteed to be unique or unique for each object instance

If I want to create an "ObjectSet", how can I get the guaranteed unique ID of each instance of an object?

I just found this: which answer

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

Solution

java. lang.System. identityHashCode(OBJ); If you really need it and understand the impact, I will do this for you It obtains the identity hash code, even if the method providing the hash code has been overwritten