<What does the @ next to a Class instance mean?> I...

# stackoverflow

[user]

What does the @ next to a Class instance mean?
I have a question while using IntelliJ IDEA, Android Studio Debug.
What does the number next to @(at) mean? No matter how hard I look for development references, I can't find them.
There are a number in brackets and a number without brackets. They have different numbers. I am curious about the difference
I guess it is the unique hash value of the class instance, but I wonder what it means more accurately.
<a href="https://i.stack.imgur.com/aoCKh.png" rel="nofollow noreferrer">enter image...