Activity Monitor - Java Virtual Memory Use is 16,333.00 TB.  How is this possible?

Activity Monitor:   Virtual Memory column -
Java Real Memory @ 330 MB
Java Virtual Memory was 16,333 TB. 
How could this be?
Running:
Safari
Mail
Pages
Activity Monitor open
Safari was incredibly slow today, as it has been a lot lately, but inconsistently.  The other computers in the house had normal speed.  I'm not a tech person.  I attached a copy of the activity monitor - how it looks right now.  I appreciate your thoughts and suggestions.  Thank you.
bottom half

As Kappy says, the virtual memory information is mostly meaningless except to developers, and most of them do not really care.
In this case the Java VM usage is most likely a math error on the part of either the operating system, or Activity Monitor (when a 64-bit number goes negative, but is then displayed as an unsigned value, it can look like what you are seeing; ignore it).
What you ARE interested in is "Real Memory" usage, and who is using it.  Look at those numbers in Activity Monitor.
If you want to see if pageout activity is affecting your performance, then start Applicaitons -> Utilities -> Terminal and run the command "sar -g 60 100" which will report pageout numbers once a minute for 100 minutes (adjust the numbers to suit your tastes).   Mostly zero means no pages outs.  Occassional spikes generally occur when starting an app or switching to an app which has been idle for awhile.  Sustained pageouts starts to indicate a problem.  High sustained pageouts means you could benefit from either having more RAM or running fewer concurrent applications.

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