scala code prints out weird Strings

[Jimit Raithatha]

Hi All,

Below is a small snippet i am working on that takes a list and splits it on character character "h".

On purpose, I'm trying to return an RDD of lists in the below code because i want to explore differences between map() and flatMap(). However, when i run the below code:

val sentences = sc.parallelize(List("hello how","are you","doing sir"))
val words = sentences.map(x=>x.split("h"))
words.foreach(println)

I get weird output as seen below:

[Ljava.lang.String;@6479f067
[Ljava.lang.String;@1962dba
[Ljava.lang.String;@2a940f26

How do i print out the actual lists?

Jimit

[Clint Gilbert]

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"[Ljava.lang.String;@6479f067" etc is the way the JVM prints out raw
arrays. Note that String.split() returns an array of Strings. If you
want the result of split() to have a nicer String representation, try
turning those to, say, Lists with .toList .

On 10/04/2015 04:54 PM, Jimit Raithatha wrote:
> Hi All,
>
> Below is a small snippet i am working on that takes a list and
> splits it on character character "h".
>
> On purpose, I'm trying to return an RDD of lists in the below code
> because i want to explore differences between map() and flatMap().
> However, when i run the below code:
>

> valsentences = sc.parallelize(List("hello how","are you","doing

> sir")) val words = sentences.map(x=>x.split("h"))
> words.foreach(println)
>
>
> I get weird output as seen below:
>
> [Ljava.lang.String;@6479f067 [Ljava.lang.String;@1962dba
> [Ljava.lang.String;@2a940f26
>
> How do i print out the actual lists?
>
> Jimit
>

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[martin odersky]

On Mon, Oct 5, 2015 at 2:55 AM, Clint Gilbert
<clint_...@hms.harvard.edu> wrote:
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>
> "[Ljava.lang.String;@6479f067" etc is the way the JVM prints out raw
> arrays. Note that String.split() returns an array of Strings. If you
> want the result of split() to have a nicer String representation, try
> turning those to, say, Lists with .toList .

Or, much more efficiently, use `deep`:

words.foreach(word => println(word.deep))

or, equivalently

for (word <- words) println(word.deep)

See: http://www.scala-lang.org/api/current/index.html#scala.Array

- Martin

> To unsubscribe from this group and stop receiving emails from it, send an email to scala-user+...@googlegroups.com.

> For more options, visit https://groups.google.com/d/optout.



--

Martin Odersky
EPFL

[Clint Gilbert]

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Cool, thanks! I never knew that method existed.

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[Jimit Raithatha]

Small update if it's of any interest:

deep() prints out Arrays whereas toList() prints out lists. 

Is there a reason why deep() would be more efficient?

Jimit

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