PostgreSQL_db_change_notification

Hello,

Does PostgreSQL supports some database change notification mechanism?
I have Java Swing application and PostgreSQL database for storing data.
The problem is that my database can change at any moment and instead of
querying
the database every 5 seconds, I would like the database to some how send my
application
a notification of a change when it happens.

I would appreciate if someone can give me example how to accomplish it
between JDBC and PostgreSQL.

Thanks.
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