Features that Java doesn't and won't have:

Extension methods

Async/await -- Java is going with lightweight threads.

* Lambda syntax took years after it was mainstream.

* I don't think Java still has string interpolation.

* List, Map literals are not a thing Java has either.

* Value types aren't in yet.

* If as expressions. You have to use ternary.

These aren't complaints. I know what I'm getting with Java. No hate.

What's wrong with List.of(1,2,3) or Map.of("a", 1, "b", 2)?

Switch expressions can do what if expressions do.

Nothing's wrong with that or with `String.format`. I just find it less ergonomic. Like I said, no complaints anywhere. You can just as well use `ExecutorService`s instead of async/await and all that.