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how to develop automatic birthday reminder java program to display reminder message to different computer

I would put the client programm in the auto start. You ask your Server via TCP if there is any birthdays. If there is one, the server returns the data. If not, the programm closes , because its enough if you check once a day.

Then your server checks with the first request ( on a new day) if there are any birthdays and if so, the server saves the birthdays. So you just have to call your database once a day. Also you have to check with every server call, if the date of the saved data is the current date, if not, you call the database.

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