Modern Java

javaにもこういう機能ありまっせというものがあれば知りたい

Project Amber

The goal of Project Amber is to explore and incubate smaller, productivity-oriented Java language features

record

sealed class

switch式

text blocks

instanceof pattern matching

repl

jshell

optional

Optional.ofNullable(null).or(() -> Optional.of("hello"))

stream

list.stream().flatMap(Optional::stream)

filter(Optional::isPresent).map(Optional::get) が Optional::stream でかける