Roughly try Java 9

Prepare Docker appropriately.

FROM java:9
COPY . /usr/src/myapp
WORKDIR /usr/src/myapp
RUN javac
CMD ["java", "Main"]

It seems that takeWhile has been newly introduced. It's been a while since I touched Java, but it's interesting because it's different.


public class Main {
  static public void main(String[] args) {
    Stream.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)
      .takeWhile(i -> i < 5)

I will do it.

$ docker build -t my-java-app .
$ docker run -it --rm --name my-running-app my-java-app

Sounds good.

I will also try jshell.

$ docker run -it my-java-app jshell

スクリーンショット 2017-10-26 05.14.33.png

It will be complemented and you can try it right away. It is still convenient to have a REPL.

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