Is there concurrent mutable Array(or any other indexed random access) in Scala/Java?

Question

I want to store count of integers in the corresponding indexes. Be able to update counts in parallel. I've found java.util.concurrent.atomic.AtomicIntegerArray but it's impossible to get underlying array through API( I want to map over this array in the end)

Answer 1

Since the AtomicIntegerArray supports length method we can iterate over it as shown below. (using scala)

(0 to atomicIntegerArray.length()-1)
   .map(atomicIntegerArray.get)
   .map( x =>  /*your map logic*/ )