Hacker News Reader

It is a preview feature right now, so the playground is adding --enable-preview. (there is a toggle for that.)

java --enable-preview Main.java

Things generally exit preview after ~2 releases.

so the example is misleading regarding the current non-preview release, got it.

Yeah, though it’ll probably be non-preview in six months, so if that’s what’s holding you back you don’t have long to wait.