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Updating Java

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Last Modified: 2016-11-12
From an Admin perspective (command line, file locations, config files),
How can I tell where java is installed?
How can I tell if/where there are multiple versions (version6,7,8/x86/x64)?
How can I update from a central source?

I think Java is a simple copy and overwrite, but I am not sure where to, and if I am looking in the right places.
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