Hi there, I wonder if there is a way that I can calculate the diff between two objects? Say, I have ...

# android

[chris.zou]

Hi there, I wonder if there is a way that I can calculate the diff between two objects? Say, I have a person1 = Person(name = "chris", age = 18), and person2 = Person(name = "chris", age = 20), Is there a way that I can check the diff between person1 and person2 is property age, besides checking the properties one-by-one myself?

[David W]

chris.zou: Doubtful. It's not even clear what a diff would mean, in this case.

[David W]

Is it the number of properties that are different? Or do you subtract all integers...and do something with the strings?

[mg6maciej]

There are a couple of libs that help with that. Here is one I found quickly: https://github.com/SQiShER/java-object-diff

[chris.zou]

In my case, I just want to know the properties(or “keys” in a JS-like sense) that are different.

[mg6maciej]

And these are usually in implementation of assertion libraries like assertj.

[chris.zou]

@mg6maciej That is great. I’ll take a look, thank you!