How do I connect a database server on a local network in java

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Java

I'm building a School Management System that will have Teacher login and Admin login. When the teacher logs in he/she will be able to view student info and score student associated to the class that they teach then Submit these Scores. Which will be saved to database then Admin can view student score and generate Reports e.t.c

Now my question is whenever the program starts should the program ask Admin to input their Local Network IP which is going to be used as a Server to Teachers Pc. Like making the Admin PC the server and where the database is located then teachers pc the client

Thanks in Advance

What I have tried:

Haven't try anything yet. Just asking