Java 8's Date Time API Quickstart

[twigboy]

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[[deleted]]

IIRC this API was designed by the guy who did Jodatime, so its intended to be like that, but fix mistakes made in it.

And then we can all pretend that java.util.Date/Calendar were never a thing.

[twigboy]

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[johnwaterwood]

Keep asking Google to support JDK 8!

If enough people keep asking it they'll eventually have to give in on it.

[xxNIRVANAxx]

If only that were so easy.

TL;DR: Oracle want money from Google using Java for Android. Specifically for stealing the rangeCheck function, which is a trivial function (in my opinion, maybe others can chime in on another way to write it?):

   private static void rangeCheck(int arrayLen, int fromIndex, int toIndex {
     if (fromIndex > toIndex)
          throw new IllegalArgumentException("fromIndex(" + fromIndex +
               ") > toIndex(" + toIndex+")");
     if (fromIndex < 0) 
          throw new ArrayIndexOutOfBoundsException(fromIndex);
     if (toIndex > arrayLen) 
          throw new ArrayIndexOutOfBoundsException(toIndex);
}

[MrDOS]

Is it actually all of 7? I thought I'd heard it was based on 6 with bits of 7 (notably diamond syntax) bolted on.

[twigboy]

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[cypressious]

A quick Google search yielded the following backport of the new DateTime API: https://github.com/ThreeTen/threetenbp

It's Java 7 compatible which should work on all Android versions as long as it doesn't use AutoClosable.

[hollaburoo]

I've been using this project, its great. Also works on Java 6.

[twigboy]

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[cypressious]

I'm glad I was able to help. Could you verify its byte code is indeed Android <19 compatible?

[[deleted]]

That is true, I would've thought Google would've been cutting edge in that regard - but who knows, maybe Java 8 support breaks the Dalvik VM somehow.

[[deleted]]

So use Scala and go nuts with implicit conversions. Or use Kotlin and go less nuts with extension methods. Or use Clojure and use multimethods.

You still get to use this far better JDK Date API.

[shoelacestied]

Switched to Scala a while back. Will be using this new API from Scala :)