command prompt /shell query

I have come across the following instruction:-
To find out if you have Java installed, and which version it is, you can
open a command prompt / shell and type in:

java -versionCould someone please assume that I know absolutely nothing and
tell me exactly how I accomplish the above instruction.I have tried all the
things that I can think of, but let us not go there....TIABrian Tozer


.

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