Java thread safe counter simple implementation code example

In the past few days, a business code needs a variable to increase from 1 every day. To this end, I simply encapsulated a thread safe counter, which can make a variable increment from 1 every day. Of course, if the project is restarted during operation, even if the date is still the same day, it will be counted again from 1. Therefore, it is more reliable to store the counter value in the database, but this does not affect the value of this code. Now post it for reference.

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