[CentOS] best way to start and shutdown programs in CentOS?

I have a Java program that I want to start up with every boot, but I'm
unsure how to do it.

There are two bootup scripts that start manually (script1.sh and
script2.sh), and when the server gets shutdown, we have another script that
we run (shutdownscript.sh) so that the DB does not get corrupted.
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