Is it possible to use a volatile variable for summation?

Question

Java

Let's say there are several threads, they add some values ​​to a volatile variable, and output the values ​​of this variable after real-time summation.
Is it possible to do so? What problems will arise?

Answer 1

Non-atomic operations on volatile variables are not thread-safe. Read more here - https://habrahabr.ru/post/108016/ - point 4