Java will be pretty much history when you remove the folder /System/Library/Java/JavaVirtualMachines/, or its contents (1.x.0.jdk). If you just want to disable Java, you could open /Applications/Utilities/Java Preferences.app and uncheck any runtime listed on the General tab. And, for good measure, don't forget to disable it in your web browser.
For details on cleaning out other Java remnants in Lion (a mostly cosmetic exercise), check out the first answer to this question.


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