How to convert Java LinkedHashMap to Scala LinkedHashMap?

Question

I'm new to Scala. I've been trying to convert a java LinkedHashMap to an equivalent collection(LinkedHashMap?) in Scala in order to preserve the insertion order.

Tried following things as suggested in other threads, but nothing seems to work!

scalaAsMap() - is messing up the order

TreeMap() - sort on keys, values, etc. is not something I'm looking for

Explicit conversion is not working.

val f = new java.util.LinkedHashMap[String, java.util.Map[String, String]]

var g: scala.collection.mutable.LinkedHashMap[String, java.util.Map[String, String]] = f

Use JavaConverters. See this doc

balaudt
– balaudt

2016-10-12 20:41:15 +00:00
Commented Oct 12, 2016 at 20:41 — balaudt
– balaudt, Commented Oct 12, 2016 at 20:41

Porcupine · Accepted Answer · 2016-10-13 07:29:53Z

2

Hmm, how about:

val javaMap = new java.util.LinkedHashMap[String, String]()
val scalaMap = javaMap.asScala

The type of scalaMap is Map[String, String] but under the hood it behaves just like LinkedHashMap.

edited Oct 13, 2016 at 7:29

answered Oct 12, 2016 at 20:46

Porcupine

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2 Comments

miniscule001 Over a year ago

javaMap.asScala is preserving the order of java map.

miniscule001 Over a year ago

However this converts Map into a regular map. See the following error: type mismatch; found : scala.collection.Map[String,scala.collection.mutable.Map[String,String]] required: scala.collection.mutable.Map[String,scala.collection.mutable.Map[String,String]]

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