What version of Java do I have installed?
Author: Deron Eriksson
Description: This Java tutorial shows how to determine what version of Java you have installed.
Tutorial created using: Windows XP || JDK 1.6.0_10

The version of JavaSW that you are running can be determined via the "-version" switch.

java -version

Typing "java -version" reveals that I have javaSW version "1.6.0_10" installed.