How many versions do I need installed?

I have three Java runtime environments in my list of "currently installed programs" They each over 100mb. They are
Java 2 Runtime Environment, SE v.1.4.2_04 and
Java 2 Runtime Environment, SE v.1.4.2_05 and
Java 2 Runtime Environment, SE v.1.4.2_06
Do I need all these? Can I uninstall 2 of them to free up much needed diskspace?
Thanks

Unless you have a specific requirement, you only need keep one version, typically the most recent. The versions are independent and don't interact.

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