They still can't, captured variables need to be "effectively final" since Java 8, meaning they aren't allowed to be written after the capture. I think that's r

They still can't, captured variables need to be "effectively final" since Java 8, meaning they aren't allowed to be written after the capture. I think that's reasonable though, capturing mutable state is a recipe for disaster, and if you really want/need to you can wrap it in a properly synchronized container (e.g. AtomicReference in Java)