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Never seen single underscore as variable, field or method name and never seen any naming convention that allowed that (and I've read a lot of open source code too). Conclusion: it's a pain only for those who didn't care about readability of their code and it's definitely not the end of the world.

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I've seen it popping up a lot lately. It's used as an identifier for lambda functions, indicating "i must use a variable identifier here, but I don't use it"

someObject.doSomething(_ -> isDerp());

Exactly the case when you get warning in Java 8. Bad code written by lazy devs and now it's time for them to pay.

No it's not, it's illegal to use _ as a lambda parameter.

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