How to print array values in Scala? I am getting different values

Question

Code:

object Permutations extends App 
{          
    val ar=Array(1,2,3).combinations(2).foreach(println(_))
}

Output:

[I@378fd1ac

[I@49097b5d
[I@6e2c634b

I am trying to execute this but I am getting some other values.

How to print array values in Scala? Can any one help to print?

Possible duplicate of [Printing array in Scala](https://stackoverflow.com/questions/17634427/printing-array-in-scala) — Gabriel Devillers, Jul 26 '18 at 10:35
Possible duplicate of https://stackoverflow.com/questions/3328085/scala-printing-arrays — joel, Jul 26 '18 at 10:37

Nagarjuna Pamu · Accepted Answer · 2018-07-26T10:34:11.077

Use mkString

object Permutations extends App {
   Array(1,2,3).combinations(2).foreach(x => println(x.mkString(", ")))
}

Scala REPL

scala> Array(1,2,3).combinations(2).foreach(x => println(x.mkString(", ")))
1, 2
1, 3
2, 3

When array instance is directly used for inside println. The toString method of array gets called and results in output like [I@49097b5d. So, use mkString for converting array instance to string.

Scala REPL

scala> println(Array(1, 2))
[I@2aadeb31

scala> Array(1, 2).mkString
res12: String = 12

scala> Array(1, 2).mkString(" ")
res13: String = 1 2

scala>

score 1 · Answer 2 · answered Jul 26 '18 at 10:52

You can't print array directly, If you will try to print it will print the reference of that array.

You are almost there, Just iterate over array of array and then on individual array and display the elements like below

Array(1,2,3).combinations(2).foreach(_.foreach(println))

Or Just convert each array to string and display like below

Array(1,2,3).combinations(2).foreach(x=>println(x.mkString(" ")))

I hope this will help you

How to print array values in Scala? I am getting different values

2 Answers2

Scala REPL

Scala REPL

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