Convert Java array to Scala collection

Question

I would like to map over a Java array in Scala. For normal Java collections, I know I could use

import scala.collection.JavaConverters._

new java.util.ArrayList[Int](1).asScala.map(_.toString)

However, for an array this conversion doesn't work:

import scala.collection.JavaConverters._

java.util.Locale.getAvailableLocales.asScala // doesn't compile

So how do I convert a Java array to a Scala collection or iterable or something I can map on?

stefanobaghino · Accepted Answer · 2016-08-03 13:01:36Z

5

You don't have to import any implicit conversion for the map to be available over Java arrays. Try running the following in Scala shell:

java.util.Locale.getAvailableLocales.map(_.toString)

The implicit conversion that allows the usage functions like map and filter over Java arrays comes with the Predef, which is imported implicitly.

As you mentioned in your own answer you can also explicitly convert an Array to another collection (which is possible thanks to the implicit conversion I mentioned previously).

answered Aug 3, 2016 at 13:01

stefanobaghino

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1 Comment

Zoltán Over a year ago

Huh. I thought IntelliJ was telling me it didn't work. Oh well.

Zoltán · Accepted Answer · 2016-08-03 12:56:46Z

4

Aand I just found it:

Locale.getAvailableLocales.to[Seq]

No need for any implicit converters, or anything.

answered Aug 3, 2016 at 12:56

Zoltán

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