How to Determine What Version of JDK I Have?

Hi,
How do I determine what version of the JDK or SDK is installed on our server?
Thanks,
Ken

There isn't any readme or license file in the JDK folder. Our JDK is not direct from Sun, it came with WebSphere App Server, so maybe IBM left out such files. Anyway, the "java -fullversion" command works. Thanks!
Ken

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