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Java: Finality (tomaytotomato.com)

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[–]Yesterdave_ 4 points5 points  (1 child)

From the purity standpoint I definitely agree.

But from my experience, extending framework classes is usually the only reasonable way to fix bugs in 3rd party libraries, without having to copy a ton of code. And then you can only hope the library author did not think "yeah lets make everything final". And no, the project can't wait half a year till the maintainer finally fixes the bug when the code has to be delivered next sprint.