Kindly I ask your attention.
Those Java Updates are importend, because they contain software updates like:
Error fixes, improvements and security fixes.
Actually they are very importend.
So preferable settings to Auto Update, when tried to update, the program will ask you over a period of time again.
When you are shoor you will not forget to update it yourself once in a while.
When you want to do this with a lot of programs, than it might be better to do all at once. Create a list or get a program such as Software Informer.
Set a date once every ? (month) and update them yourself.
If you do it a lot or all yourself, you can save Boottime, System Resources, Bandwight and Shutdowntime.
The automatic update software needs to be active, so will start at bootup.
The automatic update software needs system resources like processor and RAM.
The reserved bandwight\bandwight will be used for these things for sudden and maby with some delays.
When updated manually, you will have all left for other tasks and a better internet connection if you having a little slow internetconnection, no matter wich reson it is.
What boots up, has to be closed when you shutdown your system.
Hopefully I let you known enough and that you will find the answers you seek!
Good luck and have fun doing it!
BEST WISHES 2013!